Science of Simple Spans of Floor Joists

Поделиться
HTML-код
  • Опубликовано: 11 июн 2024
  • Learn about simple spans of floor joists, including load, bearing, span, height and width of joists, bridge blocking, and the code. Subscribe for new video uploads at ruclips.net/user/BenGromi...

Комментарии • 594

  • @ttb1513
    @ttb1513 Год назад +32

    This is simply an EXCELLENT summary for the layman, who is not a structural engineer. Thanks so much!

  • @alexjames1146
    @alexjames1146 2 года назад +74

    Simple, clear and well structured.
    Each relevant section is presented and can thus be further researched. Thank you.

  • @MegsCarpentry-lovedogs
    @MegsCarpentry-lovedogs 2 года назад +51

    During the pandemic there has been a significant increase in DIY'ers. So, your presentation is very much appreciated. I just had a brief discussion with a structural engineer this past week. I have since been researching more and more about forces on trusses and joists. All this is to help with an extension project and attic conversion in the future, after the supply chain issue and lumber prices hopefully will decline. Thank you. I also really appreciate the images and drawings. The more the merrier because visual presentations add so much more clarity and depth to any presentation, and yours was really important💯👍🇨🇦

    • @BenGromicko
      @BenGromicko  2 года назад +4

      Thanks for watching the video. The information about spans comes from Glenn at buildingcodecollege.com/.

    • @MegsCarpentry-lovedogs
      @MegsCarpentry-lovedogs 2 года назад +1

      @@BenGromicko Thank you. I have viewed a few more of your vids. The long one on inspecting cracks trusses was really informative. Keep up the good work. I will check out the link you sent. 👍🇨🇦😉

    • @Viscous_Dampers_For_Houses
      @Viscous_Dampers_For_Houses 2 года назад

      ;

    • @revolution6133
      @revolution6133 2 года назад

      Lumber prices won’t be going down for a long time. Local lumber prices are going up every week!

    • @MegsCarpentry-lovedogs
      @MegsCarpentry-lovedogs 2 года назад

      @@revolution6133 Here in Canada I am hoping that the Bank of Canada measures with their slow increase in interest rate hikes will somewhat curve the lumber prices amongst other pricing issues. Yes, patience is key. In the meantime I continue to save money, investing it in trading with solid companies that have a long history of increasing and sustaining their dividend. So, no rush because I get paid as I wait and keep reassessing the construction industry situation here in Atlantic Canada, East coast. Stay strong, keep safe.💯🇨🇦🍁

  • @kalibbybee4764
    @kalibbybee4764 2 года назад +5

    So much info jam packed in this video. Gonna have to throw it on repeat. Great work!

    • @BenGromicko
      @BenGromicko  2 года назад +1

      Awesome, thank you! Thanks for watching the video. The information about spans comes from Glenn at buildingcodecollege.com/.

  • @stuffoflardohfortheloveof
    @stuffoflardohfortheloveof 2 года назад +5

    Fair play that was extremely well presented and explained. I’m in the UK and, although, we have our own building regs, this made complete sense. Well done! 👍🙂🏴󠁧󠁢󠁷󠁬󠁳󠁿

    • @BenGromicko
      @BenGromicko  2 года назад +1

      Thank you. I love the UK. Can't wait to come back and visit.

  • @mikezimmermann89
    @mikezimmermann89 Год назад +5

    VERY WELL done! I didn’t learn much by way of practice (observation and mimicry have made sure all my DIY projects have been safe and compliant); but, now I understand WHY many requirements are what they are, and WHY certain practices seem ‘right’ and others seem ‘wrong’. In particular, I have a much better appreciation of the role of joist hangers and blocking. THANKS!

    • @BenGromicko
      @BenGromicko  Год назад +1

      Thank you! Cheers! That information is from Glenn Mathewson from buildingcodecollege.com/. Check him out.

  • @Peter-.H
    @Peter-.H 2 года назад +2

    This is a great video. No nonsense and very well explained.
    Thank you very much 👍

    • @BenGromicko
      @BenGromicko  2 года назад

      Glad it was helpful! The content was provided by Glenn at buildingcodecollege.com/.

  • @tonyv8925
    @tonyv8925 2 года назад +7

    Interesting information. I learned a few things today. Thank you for taking the time to share and teach.

    • @BenGromicko
      @BenGromicko  2 года назад +1

      Glad it was helpful! Thanks for watching the video. The information about spans comes from Glenn at buildingcodecollege.com/.

  • @bobcougar77
    @bobcougar77 Год назад +18

    Good stuff: I really liked your explanation of joists wanting to lay flat in the middle of a span and how that ties in to blocking reduces deflection. I've always heard that blocking doesn't make a floor "stronger", while experience has taught me that midspan blocking makes it "better" Your video clarified my thinking on this. Thanks!

    • @keno101
      @keno101 Год назад +3

      I've always heard that about blocking as well, but like you, I've always had a different opinion. It is just common sense that mid-span blocking will help distribute the load evenly across more of the joists at the point of maximum deflection.

    • @mikewilson9349
      @mikewilson9349 Год назад +2

      What it doing is bracing against lateral torsional buckling. That’s what this “flopping” that he talked about is. Bracing the top flange by nailing the subfloor to it and bracing the bottom flange by nailing a drywall ceiling to it does the same thing.

    • @BenGromicko
      @BenGromicko  Год назад +1

      Glad it was helpful! Thank for watching the video about simple spans of floor joists. The content was provided by Glenn Mathewson at buildingcodecollege.com/.

  • @Nonya_Business44
    @Nonya_Business44 Год назад +1

    Straight forward to the point. No stupid commentary. Also, the formulas are a plus. 👍

  • @stevenomnipitent6208
    @stevenomnipitent6208 Год назад +5

    Well done sir, I had thought that what you explained was common sense until I became involved in a rebuilding project. The carpenter didn’t understand the superior strength of the 100 year old true dimensional hardwood joists, the contractor disputed the interior walls as supporting walls. I am showing them this lecture to support my positions, although today’s professionals only want to work with new materials.

    • @mikewilson9349
      @mikewilson9349 Год назад +1

      If the joists are bearing on the interior walls, then they are “supporting walls”.

    • @BenGromicko
      @BenGromicko  Год назад

      Thank for watching the video about simple spans of floor joists. The content was provided by Glenn Mathewson at buildingcodecollege.com/.

  • @mikec5513
    @mikec5513 2 года назад +3

    Excellent delivery of the information. Thank you.

  • @Mr.Brandon.
    @Mr.Brandon. 2 года назад +6

    WOW THANK YOU. I recently bought my first house and have been working on repairing the sag in the middle of the floor. I've been sistering a bunch of the joists with new wood and its taking me a lifetime due to the incredible amount of work. Also I wasn't sure if I was taking the best approach from an engineering stand point and this helps a lot. I'm going to to utilize these bridge blocks to significantly reduce the amount of work I will need to successfully complete my DIY job. Thanks again for this knowledge, it's very valuable to me

    • @setdown2
      @setdown2 2 года назад +8

      Solid bridging will strengthen a great deal as once tied together function as a whole unit…if over eight ft. in length install two rows I did it to my house and I have 2x8s that span a bit over 12 ft, …I put in two rows of blocking and it work very well…much cheaper then sistering especially these days…good luck…

    • @BenGromicko
      @BenGromicko  2 года назад +3

      Thank for watching.

  • @mikecothran5808
    @mikecothran5808 2 года назад +5

    Ben you did a great job explaining that hidden life of a joist...thanks dude

    • @BenGromicko
      @BenGromicko  2 года назад

      Glad it was helpful! Thanks for watching the video. The information about spans comes from Glenn at buildingcodecollege.com/.

  • @The_Real_Indiana_Joe
    @The_Real_Indiana_Joe 2 года назад +9

    Allowable deflection. I used to design I-joist floors in their beginning. Most people thought I-joists were designed to span super far, but the fact is, they were designed to be super predictable. I always designed floors to over perform, because most home owners expected better performance. Most home owners would be surprised to know, at the time, 9 1/2" I-joist DID NOT out perform 2x10s in a simple span. As a designer, I was always thankful that 'unacceptable deflection' was a long way from failure.

    • @BenGromicko
      @BenGromicko  2 года назад +5

      Good comment. Thank you for watching. And I love your brother's movie.

  • @Austin1990
    @Austin1990 2 года назад +12

    As an engineer, I think codes are really cool. They take a lot of research and experience and produce simple guides.

    • @jerryhuff86
      @jerryhuff86 2 года назад +2

      So true, and yet, people dread and fear codes.

    • @BenGromicko
      @BenGromicko  2 года назад +1

      Thanks, Austin. I agree with you.

    • @G53X0Y0Z0
      @G53X0Y0Z0 2 года назад

      In our world there seems to be no end to rules and regulations, many which are based upon uneducated opinions and wild guesses that haven't had much thought put into them and are effectively useless. But when it comes to this subject, there is relatively precise data available from actual tests, so the results are predictable and can be measured. I wish all builders were aware of this. Start with your design needs, error toward the heavy side if unsure, and calculate what you need to achieve that. That's a much better approach than taking a wold guess and seeing how it turns out. And, it's always better to go a little heavier duty than needed to go a little cheaper and try to compensate some other way for marginal or sub-par performance. You never hear anyone say they wish their floor or roof wasn't so strong. Along this line, you might even find out that you can use a smaller framing member than your hunch and still meet the design goals.

    • @Austin1990
      @Austin1990 2 года назад

      @@G53X0Y0Z0
      I have a very different opinion of codes versus requirements. People should not be building anything unless they know enough to use codes, but I think codes should be more like certifications rather than requirements. Requirements are often discriminatory and political whereas codes are just standards.
      For instance, bars/clubs have much less regulations to meet than churches (at least where I live). We saw this firsthand when bureaucrats decided which establishments were essential, closing outdoor dining of small restaurants while allowing massive gatherings of corporate establishments. Non-sensical (and anti-science) requirements were placed on stores that actually facilitated viral spread rather than reducing it, in the name of science of course. Many of these destructive and financially burdening requirements are still in place across the world. It was a perfect extreme to illustrate why requiring anything, even if the reasoning sounded good at first, is a violation of freedom which should never be allowed.

    • @mechanicalman1068
      @mechanicalman1068 2 года назад

      @@Austin1990 wrong soapbox.

  • @jasoncy31
    @jasoncy31 2 года назад +1

    Lots of good info here! I'm building my own barndominium and I'm at the joist stage. I appreciate it

  • @GoHerd2001
    @GoHerd2001 2 года назад +1

    This is fantastic information. Thank you!

    • @BenGromicko
      @BenGromicko  2 года назад

      Glad it was helpful! The info came from Glenn at buildingcodecollege.com/

  • @charpnatl
    @charpnatl Год назад +1

    I have so much appreciation for this presentation I love this practical application of science!

  • @JustaSimplefact
    @JustaSimplefact Год назад +1

    So good, rebuilding a deck inside a warehouse, you put all my worries to rest. Thank you

  • @nicodiep
    @nicodiep 2 года назад +1

    Good to the point, helpful information! Liked it a lot! Thank you!

  • @kurtislane8795
    @kurtislane8795 2 года назад +1

    Great info Ben! Thank you.

    • @BenGromicko
      @BenGromicko  2 года назад

      My pleasure! The info came from Glenn at buildingcodecollege.com/

  • @stipcrane
    @stipcrane 2 года назад +2

    Excellent assemblage of information and great presentation. I enjoyed watching it.

  • @specializedconstructioncol7797
    @specializedconstructioncol7797 2 года назад

    Thanks for the Info, The Outline how it was explained was great

    • @BenGromicko
      @BenGromicko  2 года назад

      Glad it was helpful! Thanks for watching the video. The information about spans comes from Glenn at buildingcodecollege.com/.

  • @chrislambert9435
    @chrislambert9435 Год назад

    Thankyou for the help you've given in this presentation . . . Chris . . . Norwich, England

    • @BenGromicko
      @BenGromicko  Год назад

      Thank for watching the video about simple spans of floor joists. The content was provided by Glenn Mathewson at buildingcodecollege.com/.

  • @douglaspollock102
    @douglaspollock102 2 года назад +7

    Thank you for putting this together Ben. I’m in the process of building a torsion box for a CNC table, and your presentation helped me with a few terms and concepts. :)

    • @BenGromicko
      @BenGromicko  2 года назад

      Glad it was helpful!

    • @onlythetruth883
      @onlythetruth883 8 месяцев назад

      douglas
      What's a torsion box?
      And what does that CNC machine do?
      We have a small Woodwork factory.

  • @tangotango3406
    @tangotango3406 2 года назад

    Just stumbled across this vid and WOW!! Awesome! Thank you for sharing this information!!

  • @billyjacksimmons9947
    @billyjacksimmons9947 2 года назад

    I agree with Douglas, thanks for the knowledge.

  • @dongrossarth403
    @dongrossarth403 2 года назад +1

    Well explained, visual aids, photos, etc, would also help tremendously.

    • @BenGromicko
      @BenGromicko  2 года назад

      Thanks for watching the video. The information about spans comes from Glenn at buildingcodecollege.com/.

  • @martyjoseph9507
    @martyjoseph9507 Год назад

    One of the better explanations I've watched

  • @mike7357
    @mike7357 Год назад

    Very helpful video! Thank you!

    • @BenGromicko
      @BenGromicko  Год назад

      Thank you for watching. That information is from Glenn Mathewson from buildingcodecollege.com/. Check him out.

  • @cindylee2379
    @cindylee2379 2 года назад

    Thank you. This explained a lot of questions I had about why stick frames are built the way they are.

  • @DBaileyandAssociatesRealty
    @DBaileyandAssociatesRealty 2 года назад

    Love this!!! About to take the residential contractor exam.

    • @BenGromicko
      @BenGromicko  2 года назад

      Nice. Best wishes to you. Post how it goes.

  • @iandavis1355
    @iandavis1355 Год назад

    Wow, very well done. Thanks.

    • @BenGromicko
      @BenGromicko  Год назад

      Thank you too! That's from buildingcodecollege.com/glennmathewson/

  • @brucemarmy8500
    @brucemarmy8500 Год назад

    TY I actually learned some things from this video.

    • @BenGromicko
      @BenGromicko  Год назад

      All homes should be inspected by an InterNACHI certified home inspector at www.nachi.org/certified-inspectors. Thanks for commenting. - Ben.

  • @AlexeiTetenov
    @AlexeiTetenov 2 года назад

    Thank you for sharing!

    • @BenGromicko
      @BenGromicko  2 года назад

      My pleasure! The content was provided by Glenn at buildingcodecollege.com/.

  • @RP-mn2vm
    @RP-mn2vm 2 года назад

    Same I learned a bit more then expected. I love learning the why of things.

    • @BenGromicko
      @BenGromicko  2 года назад

      The content was provided by Glenn at buildingcodecollege.com/.

  • @objuan6
    @objuan6 2 года назад

    Excellent video!
    I am certain to refer to it in coming project.

  • @fluffymittens24
    @fluffymittens24 2 месяца назад

    Pretty informative. Learn with each one.

  • @shanea9613
    @shanea9613 10 месяцев назад +1

    Thank you very much. This all makes sense to me now. My attic build will be better for it. Cheers

    • @BenGromicko
      @BenGromicko  10 месяцев назад

      Great to hear! That info comes from Glenn Mathewson of buildingcodecollege.com/.

  • @chaplainand1
    @chaplainand1 2 года назад

    Thank you. Much appreciated. Now I know more about what I don't know.

  • @johngardiner8847
    @johngardiner8847 Год назад

    Beautiful explanation- concise

  • @davidfowler7558
    @davidfowler7558 Год назад

    Awesome information & explanation!!

  • @robertburke4402
    @robertburke4402 Год назад

    Good video presentation. Thanks!

    • @BenGromicko
      @BenGromicko  Год назад

      Thank for watching the video about simple spans of floor joists. The content was provided by Glenn Mathewson at buildingcodecollege.com/.

  • @chrisalister2297
    @chrisalister2297 5 месяцев назад

    Great info. Subscribed.

    • @BenGromicko
      @BenGromicko  4 месяца назад

      Thank you for subscribing.

  • @realCleanK
    @realCleanK 9 месяцев назад

    Thank you!

  • @dandeleona4760
    @dandeleona4760 2 года назад

    Wow. Right to the point. Thanks. :)

  • @michaelaltizer3571
    @michaelaltizer3571 2 года назад

    Thanks Ben Gromicko and InterNACHI

    • @BenGromicko
      @BenGromicko  2 года назад

      Our pleasure! Thanks for watching the video. The information about spans comes from Glenn at buildingcodecollege.com/.

  • @MrDarren5012
    @MrDarren5012 2 года назад

    Great video..thank you

    • @BenGromicko
      @BenGromicko  2 года назад

      Thank you too! The content was provided by Glenn at buildingcodecollege.com/.

  • @garbo8962
    @garbo8962 Год назад +2

    I live in a 16' wide row home ( actually closer to 15' wide when you subtract the 10" poured concrete basement walls. While I was drilling 4 or 5 holes thru each basement joists noticed the two doubled up ones that provide extra support I guess for where stairwell is took a lot longer to drill my 3/4" diameter holes. While pulling wire noticed the doubled up joust were 3 by 12 and a different guess stronger species of wood. Bet contractors have not did this use in many years. While an electrical apprentice we were taught to avoid the middle third of all joists whenever possible. Also believed it was better to drill two 3/4" holes at least two inches apart then a big 1.25" hole for wires.

  • @brettharman8921
    @brettharman8921 2 года назад +4

    floor decks people perceive to be "unacceptable" is really due to the deck weight per sq ft being "light". a "light" deck produces a lot of vibrations when people walk across the deck and describe this as "bouncing". if you would have placed 1-1/2" of of gypsum leveler on top of that same deck configuration, hence increasing its weight per sq ft, the deck would produce less vibrations and be perceived to perform better. vibration reduction is also done with blocking/ bridging along the joists, sheathing the underside of decks and perpendicular partitions to the floor joist direction. these items mostly dampen vibrations by connecting all the diaphragm/ floor elements together at more "points" to absorb vibrations induced by loads/ people walking- good video!!

    • @DGander007
      @DGander007 2 года назад

      Bingo !

    • @BenGromicko
      @BenGromicko  2 года назад

      Thanks for watching and commenting, Brett.

  • @mechanicalman1068
    @mechanicalman1068 2 года назад +1

    Plenty of comments from DIYers here. As a contractor and carpenter with 30 years experience, I’ll say this was excellent information. I’d caution DIYers, though, that building inspection, building science and actually building are very different things. Proper execution is critical, often overlooked and generally learned on the job. Also, the engineer I work with, who I’ve collaborated with on more than a dozen projects over 15 years, consults me of all the designs he does for me to see which is most practical in the field. He has enough humility to know that he doesn’t know more about building than I do, and over the years he has politely slapped me down enough times for me to realize I know less about structural work than I’d like to think. And a DIYer certainly knows less about both than either of us. So I think it’s great people doing their own work and I get the appeal, but keep in mind that often you don’t know what you don’t know and no amount of RUclips can do much to change that. And if you don’t have permits, you don’t even have an inspector to keep you straight, the bare minimum really. My advice is to ingratiate yourself to a builder and see if you can get some paid consultation time. Again, you don’t know what you don’t know. I’ve made tens of thousands of dollars fixing work that homeowners did themselves.

    • @BenGromicko
      @BenGromicko  2 года назад

      Glad you enjoyed watching the video.

  • @Krunch2020
    @Krunch2020 3 месяца назад

    Thanks. Folks should know that a structural engineer can analyze issues for little money. I opened a ceiling and found one 2x4 holding a roof load. I knew I could use a simple 4x6 beam but couldn’t contact the clients to approve the design change. I went to a local structural engineer. He quickly entered the data of the existing structure in that area into his computer program. I was able to use three select structural 2x4’s laminated together and keep them hidden above the ceiling drywall. $200 well spent!

    • @BenGromicko
      @BenGromicko  3 месяца назад

      Thank you for watching our videos and commenting here.

  • @michaelneville2915
    @michaelneville2915 Год назад

    Thanks Ben, learnt something and enjoyed your presentation. I know that seasoned and unseasoned timber have different ratings as well.

    • @BenGromicko
      @BenGromicko  Год назад

      Thank for watching the video about simple spans of floor joists. The content was provided by Glenn Mathewson at buildingcodecollege.com/.

  • @charlesviner1565
    @charlesviner1565 2 года назад

    New subscriber from Davenport Iowa USA 👍

    • @BenGromicko
      @BenGromicko  2 года назад

      Welcome aboard! The info of this video came from Glenn at buildingcodecollege.com/

  • @seankelly1291
    @seankelly1291 Год назад

    I learned more information, useful information, here than any other video designed to easily propogate as an ad-hoc, overly generalized, and otherwise useless answer my question. At least now I know how to mitigate my problem.

  • @lonhenderson5671
    @lonhenderson5671 2 года назад

    Well done!

    • @BenGromicko
      @BenGromicko  2 года назад

      Thanks, Lon, for watching the video. The information about spans comes from Glenn at buildingcodecollege.com/.

  • @invest2wealth111
    @invest2wealth111 2 года назад

    Thank you! 👍

  • @erickv8684
    @erickv8684 Год назад

    This is the side of RUclips for men, fathers, and builders of America.

  • @someonespadre
    @someonespadre 2 года назад +2

    My house was built in 1935. Over the living room are 6x8 joists (exposed, no blocking). True measurements are 5-1/2 x 7-1/4. They are on 32” centers, 15 foot spans. Walls are concrete block with open cells. I don’t know how much they bear. The first joist is on the edge of the stairwell and has the bedroom wall sitting on it, it is visibly deflected or curved downwards and has cracks along roughly the middle sides. The rest of the joists look good, straight, no cracks. The sub floor above is 1x12 knotty pine panelling with Douglas fir floor on top.

    • @BenGromicko
      @BenGromicko  2 года назад

      Good to hear, David. Thanks for watching.

  • @tamerhamdy3308
    @tamerhamdy3308 Год назад

    wonderful

  • @rdred8693
    @rdred8693 2 месяца назад

    Very helpful for aquarium keepers

  • @Faruk651
    @Faruk651 Год назад +1

    I hope this video gets watch by those in trades who believes mid span blocking is not really necessary. No, it is a MUST for a wood floor joists. In my own build i blocked every joist tight and glued. The difference before and after is incredible. It doesn’t only help to stiffen the floors but it reduces vibrations.

    • @BenGromicko
      @BenGromicko  Год назад

      Thank you for watching. That information is from Glenn Mathewson from buildingcodecollege.com/. Check him out.

    • @briangc1972
      @briangc1972 Год назад +1

      The number of blocks and the spacing of the blocks often overlooked. Too often people put a single row of blocks in the middle and call it good. A block every 4 feet along the length of joist is a cheap investment and a huge improvement in structural integrity and strength. Structural screws instead of nails are actually faster to install and are by far stiffer and stronger than nails as well. No such thing as too many blocks.

    • @Faruk651
      @Faruk651 Год назад

      @@briangc1972 Totally agree from my experience. Material doesn’t cost much to blocking but it is a little labour intense if it is done right. To me blocks needs to be a tight fit and glued and screwed. If you are nailing a loose block you are asking for squeks as the joists deflect.

  • @cnuts45
    @cnuts45 2 года назад

    Amazing job at explaining this concept

    • @BenGromicko
      @BenGromicko  2 года назад

      Thank you.

    • @cnuts45
      @cnuts45 2 года назад

      @@BenGromicko I hope you teach at a high school or college because you’ve got a gift

  • @2020HotShotTruckingLLC
    @2020HotShotTruckingLLC 2 года назад +2

    I built a "pit" for servicing my trucks and searched for guidelines for the beams I used. I couldn't find anything that applied to what I was building so I erred on the side of safety. The pit was constructed outside between my deck and my garage so I don't have to worry about air quality like pits built in a garage floor. I started by building a 10 x 10 concrete pad with two sections of concrete filled block pillars 8" x 32" at the end (actually, these pillars are part of a concrete filled concrete block wall, so the pillars are effectively 16 x 32 also). Then 4 concrete filled concrete block pillars 16" x 32". I spanned the pillars with 2-2x12's and 4 2x10's to create each "beam" with added blocking and 2x10's for decking. The beams are about 14' long, supported by the 3 pillars on each side. My trucks weigh around 9500 lbs. and I was real nervous when I tested it the first time. I set up a tape measure at the middle of the longest span and was unable to detect any deflection whatsoever. Obviously I over engineered my project, but at least I know that I can change the oil in a semi without having to rebuild it bigger.

    • @BenGromicko
      @BenGromicko  2 года назад +1

      Great information and feedback, Hot Shot Truckin'. Thanks for watching and sharing that information.

  • @Gandoff2000
    @Gandoff2000 2 года назад

    Very interesting!

    • @BenGromicko
      @BenGromicko  2 года назад

      I agree. The info of this video came from Glenn at buildingcodecollege.com/

  • @DerekMacaroni
    @DerekMacaroni 11 месяцев назад +1

    Thanks for this video. I was worried that the floor spans in my Minecraft castle might be too long, but this helped me to understand why some of the historical floor plans I've seen had >10 m wide rooms with wooden floors -- medieval contractors probably didn't care about floor sag as much as we do today (and trusses probably helped too). Now I can build my 10 m wide wood floors without worrying about historical accuracy. I'll just have to remember not to put all my chests in the middle of the room.

    • @BenGromicko
      @BenGromicko  10 месяцев назад

      Great to hear! That info comes from Glenn Mathewson of buildingcodecollege.com/.

  • @scotttprosser4719
    @scotttprosser4719 Год назад +1

    Very good informative video. Try to find a span table for your jurisdiction and you will find that the allowable span increases with the addition of solid blocking, cross bridging, cross bridging with strapping under the joist and also with construction adhesive with the subfloor. I believe in our area the max span for 2x10 ss spf on 16" oc is 16' 1" with 2 rows of crossbridging with strapping and glued 5/8" subfloor as opposed to about 13' 5' with just subfloor and one row of strapping which is the bare minimum.

  • @humansustainability
    @humansustainability 6 месяцев назад

    great! thanks

  • @tomtaggart3788
    @tomtaggart3788 Год назад

    Well, I’m glad someone else out there is advocating for a minimum of L/360 TL deflection!

    • @BenGromicko
      @BenGromicko  10 месяцев назад

      Yep. That info comes from Glenn Mathewson of buildingcodecollege.com/ who wrote that content.

  • @kenschmidt6522
    @kenschmidt6522 2 года назад

    I added blocking to a 1922 home we owned. It made a huge difference.

  • @paulleos162
    @paulleos162 Год назад +2

    I used 2x 6x 30' iron C purlin. I welded back to back to make into an "I " beam. For my
    Floor joists. No squeeking here. I put the 3/4 inch plywood across two sections to see deflection in floor then I spaced out I beams until no floor deflection. I also put another 1/2" plywood glued to 3/4" layer opposite direction.
    Very very strong floor.

  • @danieljackson4266
    @danieljackson4266 2 года назад

    Great video

  • @rajivvashm6046
    @rajivvashm6046 2 года назад +1

    awesome tutorial... just what I need to confirm the builder is doing it right ! :) I will sleep better cheers

  • @thomasb.1825
    @thomasb.1825 2 года назад +9

    Very interesting and above all informative .. tone, voice and content are perfect … just wish you were able to provide us with drawings or pictures for each case it makes it way easier for your audience to understand faster or make sure we have the same idea in mind … I’m nonetheless very grateful for the great explanation you granted us with in this video!

    • @BenGromicko
      @BenGromicko  2 года назад

      Good comment and advice, Thomas. I'll do better next time.

    • @Garciastar7Blogspot
      @Garciastar7Blogspot 9 месяцев назад

      I am a visual person so I have to see it so having a pictures or drawings illustrations that would be perfect that would be nice if could do part 2 with images would be amazing.
      Just a thought.
      Thank you so much.

  • @oldgoat8861
    @oldgoat8861 Год назад

    Well presented for those who need to learn the basics.👍👍👌👌

  • @dutchleussink156
    @dutchleussink156 2 года назад

    Thank You Sir

    • @BenGromicko
      @BenGromicko  2 года назад

      Most welcome. Thanks for watching the video. The information about spans comes from Glenn at buildingcodecollege.com/.

  • @peterfitzpatrick7032
    @peterfitzpatrick7032 Год назад +2

    Let us re-joist for this free education !! 🤗
    😎👍☘🍺

    • @BenGromicko
      @BenGromicko  Год назад +1

      I love that joke. Reminds me of the "dad" jokes I tell my kids.

  • @keithkuckler2551
    @keithkuckler2551 2 года назад +5

    My od carpenter rule of thumb, when using softwood framing lumber, was to divide the span, and, add 2, so for a 16 foot span, you would use a 2x10 for a normal load. Using structural fir, makes them stiffer, or switching from 16inch spacing to 12 inch spacing also increases strength, Adding blocking between joists stiffens floors because is limits deflection. Now we use a lot of structural lumber, or engineered floor systems, here we generally rely on the reccomendations of the supplier.

    • @BenGromicko
      @BenGromicko  2 года назад

      That's great stuff, Keith. Thank you for sharing.

    • @warrenshalm550
      @warrenshalm550 2 года назад

      Hi Keith. Here in Canada our code will allow a 2x10 to span approximately 13'-8" to 14' depending on bringing and strapping. 2x12's are 15'-6" or slightly better. These are @ 16" o.c.. it was an interesting talk.

    • @keithkuckler2551
      @keithkuckler2551 2 года назад

      @@warrenshalm550 I live in estreme north east Minnesota, our county does not enforce a building code on resedential structures. Most licensed contractors do use the national codes. Your spans sound about what I have used, of course if you specify structural grade fir, as opposed to just softwood lumber, you will get much stiffer floors. As I said, using 12 on centers will also allow for longer spans with a given joist. Also using bridging to avoid deflection also helps. Most of our floors are now down with TJI's or some other floor truss system. The TJI's are lighter, have knock outs for electrical and plumbing, and, can be ordered in long lenghts, so even if you use a center beam or wall you can use a continuous joist, we can get them up to 32 feet in lenght. They have also replaced solid wood rafters in a lot of roof framing.

    • @warrenshalm550
      @warrenshalm550 2 года назад

      You're absolutely correct Keith. The betyer grades of lumber have greater spans and of course engineered lumbere has become popular for reasons you state. What has driven the choice in the last year for us has been availability shortages. That is in everything related to construction.

  • @stratocruising
    @stratocruising 2 года назад +4

    One point I would like to add from the real world is the effect of knots in joists. During an inspection, I saw a garage ceiling with 2 x 8 joists. Three consecutive joists had a knot in the bottom edge about three inches deep. They had deflected about two inches and were starting to crack along their length from the top of the knot. I would say that the framer should have been hung from those joists for using those particular pieces, but he'd probably escape unharmed.

    • @The_Real_Indiana_Joe
      @The_Real_Indiana_Joe 2 года назад +1

      😅

    • @BenGromicko
      @BenGromicko  2 года назад +3

      You're correct. Good point about knots in solid lumber. They're like bored holes.

  • @kennytaylor2738
    @kennytaylor2738 Год назад

    Excellent video my friend

    • @BenGromicko
      @BenGromicko  Год назад

      Thank you! Cheers! That information is from Glenn Mathewson from buildingcodecollege.com/. Check him out.

  • @PaintSlinger99
    @PaintSlinger99 9 месяцев назад

    Very interesting and informative

  • @georgeliquor2931
    @georgeliquor2931 2 года назад +2

    An old joiner once told me half span plus 1, so a span of 10 feet/2=5+1=6, joist required=6x2

    • @westwonic
      @westwonic 2 года назад

      I was taught the same.

    • @BenGromicko
      @BenGromicko  2 года назад

      I love those old-timer rule of thumbs.

    • @georgeliquor2931
      @georgeliquor2931 2 года назад +1

      @@BenGromicko Dont use a screw when a nail will do, Geof Hirst RIP

    • @internachi
      @internachi 2 года назад

      @@georgeliquor2931 Nice.

  • @mayboo9368
    @mayboo9368 2 месяца назад

    Nice!!

  • @BuddhatheBlackDog
    @BuddhatheBlackDog 5 месяцев назад

    I learned things watching this.

    • @BenGromicko
      @BenGromicko  5 месяцев назад

      Thank you for watching and commenting here. More videos are available at www.nachi.org/webinars.

  • @PedroMarinURL
    @PedroMarinURL 2 года назад +1

    magnificent explanation..! Ben, You are an Engineer...! or better, a great engineering instructor..! simple, easy..!

    • @BenGromicko
      @BenGromicko  2 года назад

      Wow, thanks! Thanks for watching the video. The information about spans comes from Glenn at buildingcodecollege.com/.

  • @michaelmccormick1547
    @michaelmccormick1547 2 года назад

    I am currently restoring (not rebuilding) a home that is about 100 years old. They used 2x6s and 2x8 for the floor joists. Many have cracked on the sill plates. I am keeping with the same pattern but replacing joists of the same size using joist hangers, structural bolts for sistering, blocking, and post supports. it is a small house, 1300 sqft, so without over-engineering things, I think updated lumber and structural support should be enough to keep this house sitting for much longer. It is also grandfathered into our local building codes so I do not need to perform intense structural changes or have them inspected to modern codes.

    • @BenGromicko
      @BenGromicko  2 года назад +1

      Thanks for watching, Michael. And for commenting.

  • @unclecraigbaannawk
    @unclecraigbaannawk Год назад

    wow...in simple terms....thanks...this video was just what I needed...all my beams are solid teak and I was worried about the span I am building....not anymore!

    • @BenGromicko
      @BenGromicko  Год назад

      That info was provided by Glenn Mathewson from buildingcodecollege.com/.

  • @markb.1259
    @markb.1259 Год назад

    Very interesting information. Thank you! Almost couldn't see the speaker other than his arms and face... 🙂

  • @hansangb
    @hansangb 2 года назад +2

    Ahhhh brings back Statics and Strengths of Materials classes from 25 years ago! :) Once you take statics, you'll see the whole world in a different way. 😂

    • @BenGromicko
      @BenGromicko  2 года назад

      Interesting! Thanks for watching the video. The information about spans comes from Glenn at buildingcodecollege.com/.

    • @chiefinspector7280
      @chiefinspector7280 2 года назад

      its about levers and pulleys

  • @alphaomegaboom
    @alphaomegaboom Месяц назад

    pictures or animations (real life examples) would help this video alot

  • @mariuszzobinski4564
    @mariuszzobinski4564 Год назад

    Topic very well explained! :) But in my opinion it would be even 100x better with ilustrations of what you are describing at the moment.

  • @LordVoltRod2c
    @LordVoltRod2c 2 года назад +1

    I wonder if joist flop over is similar to when I was a little kid and decided to do a tight rope walk on the edge of the cat's litter box. I balanced myself so the plastic edge of the litter box was supporting my weight, but it tipped over at mid-point. I think it's because the plastic started to buckle causing a twist in my applied weight. There was a solid support for my weight at the box corner but when I got mid-point something like torsion was created. Of course, my mom was not happy about me using the cat box for stress testing.

    • @BenGromicko
      @BenGromicko  2 года назад +1

      Thanks for watching. The info of this video came from Glenn at buildingcodecollege.com/

  • @Thedar561
    @Thedar561 3 месяца назад

    A old school builder taught me years ago about spans.
    Get your length and half it and plus one is the best I’ve ever heard.
    So on a 20 ft Span half it plus one and it’s a 11 inch timber

    • @BenGromicko
      @BenGromicko  3 месяца назад

      That's a great tip. I like it.

  • @scottperry8388
    @scottperry8388 2 года назад +1

    Thank you, very informative. It was a little to technical for a layman, though. Some illustrations could have helped, like at the beginning, to understand the industry specific terms.

    • @BenGromicko
      @BenGromicko  2 года назад

      Glad it was helpful! The content was provided by Glenn at buildingcodecollege.com/.

  • @fredmyers423
    @fredmyers423 2 года назад

    Thanks, I am building a log cabin with 30 foot span however I am installing footing piers every 10 feet and was wondering about floor joist loads

  • @michaeldiaz4285
    @michaeldiaz4285 5 месяцев назад

    Scrolled through your channel to see if more videos like this existed. Sadly no :/
    I subscribed anyways, hopefully there are more informative videos about structure ? This was so well explained !! Do it for foundations or walls or a frame cabins!! Would
    Be amazing

  • @rhymereason3449
    @rhymereason3449 2 года назад

    Very informative. I wish someone would talk about the relationship between deflection and load. For example are the directly proportional - i.e. for a given span does twice the psf equate to twice the deflection? And what are the deflections before a joist actually falls from shear? I'd like to be able to calculate the actual weight a span can carry before failure if deflection is not a critical factor.

    • @BenGromicko
      @BenGromicko  2 года назад

      Good idea, R&R.

    • @rhymereason3449
      @rhymereason3449 Год назад

      @Robert Swaine Thanks for that detailed answer! I had 2 years of general Engineering studies but switched to Comp Sci before picking an Engineering Major... but I still find structural and mechanical engineering fascinating. I get why the emphasis with joists is always on deflection... but sometimes I don't care about deflection or "bounce" and just want to know if a structure will carry the load with a reasonable margin of error baked in. These are usually just shelving or storage projects - never anything life critical btw. And yeah... I can see how testing wood for tensile strength could be real tricky!

  • @johnclause765
    @johnclause765 5 месяцев назад

    If you an at the load limit of a joist, and change the centers to 12 inch centers and glue and screw the sub floor would it be as good as if you used wider joists on standard centers?

    • @BenGromicko
      @BenGromicko  4 месяца назад

      Thanks for commenting. Good question.

  • @lizannelorusso6221
    @lizannelorusso6221 2 года назад

    Very helpful video. I want to lift my floor joists (in order to replace the center beam or main girder) so I would like to clarify with you that using a 4x6x10' piece of lumber supported by two jacks (of appropriate strength) would be better than say a 2x8x10' piece of lumber as it doesn't have the same amount of area for the jack to support the beam above. Each 4x6x10 will likely support 7 floor joists. (I will do a row of these to support 45ft length house.) With an estimated house weight of 150,000 lbs, I'm planning to use a series of 5 support beams (2 jacks each) for a total of 10 jacks on one side of the girder and the same set up on the other side of the girder) If my jacks hold 15000 lbs each then I have 150,000 lbs supported on just one side of the girder. I personally think a wider piece of lumber would be better than a narrow piece of lumber. Thoughts?

    • @edwardschmitt5710
      @edwardschmitt5710 2 года назад +2

      This is a comment section not free structural engineering. And you need to lift all ten jacks in synch with each other or you will damage your framing and sheet rock will crack all over.

    • @BenGromicko
      @BenGromicko  2 года назад

      Thank you, Lizanne, for watching. I appreciate it. And your comments.

    • @MAGAMAN
      @MAGAMAN Год назад +1

      @@BenGromicko Way to completely ignore their questions.