How to install osb sheathing installation instructions guide, roof deck OSB sheeting install tips
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- Опубликовано: 11 фев 2018
- How to install osb roof deck sheathing. Installation instructions. installing OSB structural roof sheathing panels to a sloped shed Style overhead deck canopy
OSB which is Oriented Strand Board is a structural panel unlike conventional plywood which is laminated thin wood layers pressed and glued, OSB offers several unique benefits.
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First off OSB which is a structural panel can be installed in any direction and still maintain its strength opposed to plywood what you typically cross joists members left and right with the green.
Second OSB has a dry finish side and a laminated coated side. The installation is always nominated coated side facing the living area for the downside. The dry side is exposed to the exterior.
The reason for the lamination to face the interior is that it's a protective coating that prevents condensation from dry rotting the OSB panel.
Typically when installing OSB panels animals are step staggered at least two joist cavities from another as shown in the video
Typically as you progress upward after 1 course row of 4 foot is installed your next panel should be shifted left or right minimum of two Bay cavities 32in and panels should not but up laterally against each other. You want to try to maintain at least an eighth of an inch Gap which allows for expansion and contraction of the OSP product which prevents roof buckling in extreme Heats and humidity.
Since this particular shed style sloped roof is installed over top of a frame system where it's joist are based on 16in on Center there's no requirement for a Simpson spacer clip in between the joists cavity. In the case where joists are spaced 24 in apart then there would be a requirement to have a panel clip which is shaped like an H installed between the joist connecting the panels together and automatically providing a 1/8 inch expansion Gap in a lateral form.
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As someone who inspects OSB assemblies on an everyday basis, a few comments:
- OSB actually stands for Oriented Strand Board. This means the strands of wood are oriented in such a way as to maximize the structural performance of the panels.
- For most field applications, the panels should be spaced 1/8” at the 8’ seams AND at the 4’ butt joints, as the panels will expand in both the length and width directions.
- Panels have a smooth side (platen side in the press) and rough side (screen side in the press) and the recommendation for most roof assemblies is that the rough side of the product faces UP since it provides a little extra traction for workers in pitched applications. For most manufacturers the smooth side is stamped with the production information and the rough side receives the nail guide markings. STRUCTURALLY there is no reason to orient the panels one way or the other.
A few of bonus tips - ALWAYS position the 8’ edges of the panels in a perpendicular orientation to your supports, make sure any cut panels cross at least two support spans to ensure the structural integrity of your cut panels mirrors that of your full panels, and install the panels using the specified 8d nails - avoid staples whenever possible!
This was very sound advice. I grew up roof decking and all this applied. I miss it sometimes, just not that Georgia heat.
Also, NEVER break another sheet on the same joints as the sheet above or below it!
What he said, "about maintaining g an 1/8" gap between ends as well a sides of 4 x 8 0riented Strand panel seams.
It only ma,especially sense that IF ... the 4' dimension will expand that the 8' dimension will expand twice as much.
Yes Oriented is correct sir
@@rudygeorgiamulesandcountry1594 - Because of the specific orientation of the wood fibers, the panels expand about the same amount across the 4’ width as they do along the 8’ length.
Great video. Every bit of information is helpful to us DIY'ERS. ❤
Great video! I learned dry side up on osb... Glad I got the tip before I installed on my tiny home build. Thank you!!!
Thank you for all the much needed tips! I am replacing a side of our roof and this is very helpful
Brian Riley hey no problem preciate the feedback glad to help out don't forget to like us and subscribe thank you
Super awesome video! Kept it short and sweet! Yet extremely helpful and informative. And,
You got straight to the point!
Thank you
Thanks, appreciated your clear explanation.
Thank you for the info!
Thank you, It resolved the question I been wondering with osb expanding in weather conditions. Spacing and which ways to space the 1/8 gap.
Two or three 8 penny nails evenly spaced out are great spacers in a pinch.
Your videos are very helpful and detailed. I want to put a 16 x20 ft roof on my deck. Can I use flush beam instead of drop beam? I mean the roof rafters are 16 ft and could we flush them with ledger board and structural beam without any support or blocking between them?
Thank you sir
Laminate side is good for paint it the eaves as well added bonus
Thanks!
Hi Vince do you have video about same roofing framing installation attached in the existing roofing like this one with 2x6 ? I need to see how you started doing the cutting framing and lineal in the roofing thank you
Sorry just the sheathing video.
I will be looking at a lot of video real soon because i'm about to start building my 2nd house soon. thanks
If you are stripping a tiles roof from top to bottom and sheeting from the top, how do you do you’re last cut at the bottom so you’re tile doesn’t dip down
I appreciate all of your videos and you have been very responsive to people's question! Very professional! I see that you will run the OSB all the way up to the existing roof. What is the process for dealing with the transition? I understand you are going to use Roll roofing and metal flashing over the transition area, but I was hoping you could elaborate on how the material is installed. For example is the metal first or the roll roofing?
I usually run two parts. Felt up to and under the shingle of the of the roof that's being tied into. Then I put minimum 12in wide strip of flashing horizontally centering 6 in across the deck scene where it ends at the roof tie in. This prevents sinking or settling of the new roof to be installed. Then install your roof membrane all the way up slightly under the tie in existing roof. Then I run additional flashing 24 in horizontally. Roughly 16 in up under the shingle of an existing house at approximately 8 in overlapping the new membrane roof to the shed style roof no fasteners exposed
@@Chrdiy thank you very much!
I would like to see how u tied those rafters into the roof and making it water tight??
Yeah sorry didn't show that in this video but miter cuts on rafters to the roof deck then sheathing up to the shingle then roll roofing & metal flashing up under the shingle and over the top of the rolled Roofing if that helps you
Can u use screws to fasten the plywood to the rafters on a simple outside lean patio cover???
Absolutely. Ty
any idea what the "mechanical brackets" are called that you would use here to secure the mitre cut end of the rafter to the roof? Thanks!
Simpson strong tie...rafter tie
What thickness of OSB did you use?
I have 4 Amish Men that are going to put a new roof on my old garage including new trusses. It's approximately 600 square feet and want to know what thickness OSB is best for sheathing and are the little spacers recommended. This job starts in Mid July
Spacer clips are a must have between each joist and all edges. If joist spacing is 16" on center you can use 7 16th isb or 3/4. If jkist are spaced 24" o.c. you can only use 3/4". Good luck
Thank you for your video. Can I use a different or better plywood than OSB panel for the roof?
Well you can use whatever you want but you have to remember any kind of plywood is multiple laminate sheets glued together and your subject to exterior weather conditions like moisture. So usually when you use the OSB the skin or laminate side which is coated faces the bottom. The dry side or unlaminated side faces up and then the roof gets installed directly to that. So the practical usefulness of OSB is that there's no way for it to delaminate as the roof coats the top and the bottom which is exposed to any type of atmosphere or moisture has a protective skin coating on it. But you can still use plywood if you think at this point it's a better product
Does anyone know if when sheathing a gambrel roof do you cut the ends at angles so they meet up nicely or do you leave a big triangle shaped gap and just shingle over?
Never found the need to angle edge. Not furniture. Ply or osb. Small fap is acceptable as long as one surface does not project past the other creating a shelf like lip. Set so each panl above and below touches one another at the underside along with being completely flush to the rafters
Go for IT ... !
All the literature on Oriented strand board says 1/8 gap on all edges
you didn't hear him it's not "Oriented" its "Obscure strand board" pay attention gosh! LMAO
@@Bartolobot It's Oriented Strand Board GENIUS.....What a Asshat
what about plywood
yes, ply and osb
Hello We are doing the same roof. How did you tie in the old roof to the new
Field miter each rafter to the pitch of the existing roof establishing the pitch on your shed style roof. Flat receiver board must be placed attached to the existing Rafters of the house. Then each new rafter for the overhang roof is that attach to that using Taylor's and Simpson strong tie Hardware. If you're unfamiliar with this you will definitely need the expertise of a carpenter
How far apart do does nails or screws go on each rafters, including the ends?
6-8 per 4' each rafter
dont you have to space all 4 edges ? verticle and horizontal
Nice videos
What is the standard thickness of OSB used in Georgia?
Not sure about Georgia how ever OSB manufacturers make it as 7/16 of an inch and 3/4 of an inch. Typical uses where rafters are centered at 16 inch spacing 7/16 is acceptable or you could use the heavy or board at 3/4 inch. We are rafter spans or 24 inch Center on older homes you must use the 3/4 inch.
Always check with your local code enforcement officials to verify your plans prior to
If my rafters were 24" for a bike shed type lean to is 7/16" osb with h clips ok?
dry side? wet side?
Oriented Strand Board.
Why arent the trusses blocked so that the 8ft edges of the OSB have something to nail them to?
Is there it's left and right step staggered across the middle of the platform. You don't see that in this video. The video is regarding OSB only, not framming
shit i 1/8" gaped the ends also on my new roof lol and used clips on all sides but sence the osb bords said this side down on the slick side I got that right and the 4' stagger. dam I could cave saved on clips O well it's all under architectural shingles now I guess I'm good. I screwed the he'll out of it all. 2" screws . everything I build is definitely a 16" center because osb needs it in my opinion.
How thick is the osb?
Is 7/16 osb recommended for this roof?
Tx
7/16" is code approved only when rafters are not more than 16" oc spacing. Anything wider you must use 3/4"
Sounds good
Thank you
I live in a traditional house in Cyprus and i want to put OCB on the roof. Can you tell me pls how to estimate how much ocb i need for the roof.
There's no real way without measuring your roof so basically measurer crossed fascia where the gutter hangs up to the peak of a particular side and multiply the math each sheet covers roughly 32 sqft nobody to help you without having measurements
@@Chrdiy ok I will do it thx a lot
Whatever square footage you need to cover, divide that by 32. Round up. If you have a large coverage area, add at least 10% to the total.
@@Jay-tk7ib thx a lot man
Crete uses concrete and steel roofs,. You would be a lot better off doing a more traditional style house if you can
US building codes make it near impossable for us to build solid houses for cheap
My house in the back is 40ft by 20ft roof. The roof on each side is 12 by 40. It has a 1/2 thick plywood. I found out for this side roof, I need 3/4 plywood. Do I need to remove all of the 1/2 inch plywood tha is on the roof? Or can I lay down an extra sheet on top of the exist plywood?
Typically we only need three quarter inch plywood at the rafter spacing is 24 inch apart?
And if you did change the sheathing thickness you always remove what's there never go over
Rafters are 24 inch apart
So I can’t use a 1/2 inch sheet on top of the existing plywood?
I can use metal clips on the 1/2 plywood for sturdiness
I got 2x6s 16oc, would I follow this way too?
Yes. Dont forget spacer clips
Ok, and you do one row at a time?
I never saw any noggins between the rafters is that not needed on 16 inch on centre
It's there. Not shown
Did you put the noggins how for down the span? Cause when you see the OSB board going along horizontally you can see the ground. Why I'm ask I'm considering put up a shed 6x2 beams 16 oc
Those rafters are a little oversized for 16 oc beyond code
What's the name of the spacer clip?
Sometimes called an expansion clip, spacer clip, or simply panel clip
How u seal gap between boards? What u use?
You dont. Gaps are fir expnsion and contraction. Thats the idea for spacing. Other wise the deck will buckle under heat from the sun
@@Chrdiy right i know but how do u cover them tho? to prevent leaks or do u ?
@@Eastbaypisces the water never get to the wood?. You then install your felt or membrane depending on what type of roofing you're doing, then you install your Roofing coverage, that's it
@@Chrdiy ok and what about when fastening dripedge, what size nails u use?
@@Eastbaypisces u can 1 1/2"
What brand of osb are you using there? What is the quality like? What we get in our area is norboard, which is absolute junk and shouldnt be sold imo.
Sierra. Good product
It makes no sense that your plywood expands on the horizontal axis but not vertical….
Hi do u know what kind of scews it takes to screw the osb roofing thank you
You could use a coated deck screw or a coated sinker nail
@@Chrdiy hi got it!! thank you vincent dramis for your help great video thanks for the tips 😉
1/2" or 3/4"?
Hi. 7/16 for 16" on center rafters.
3/4" for rafters set 24" oc
Oriented strand board?
Yes we know.....his mouth screwed up the vid...lol....been hearing it for years now. Ty
Rafters are placed at center measurements so the sheeting ends match centers of the rafters. What about the edges? Would have to be slightly closer so the end of the sheeting matches the outer edge of the rafter wouldn’t it?
What?. Rafters set are 16" or 24" oc. Two ends meet in the center of any rafter. No matter where you start
@@Chrdiy the fist rafter should be placed 16” from the outside of the rim joist and then 16”” c-c to the other side.
Yeah thanks we're aware it's oriented strand board his mouth messed up when he did the video thanks buddy
At rafters set 16" o.c. we installed 7/16" osb panels
@@Chrdiy how much was that? Tnx
Oriented Strand Board. Not obscured.
Doesn’t look like a Philadelphian neighborhood, but that is definitely a Philadelphian accent.
South jersey. Just minutes from phily bridges
Does the stamp go on top or the bottom? Or does that even matter. It’s sheathing like who cares if it goes either side right. Oh yeah that hating ass inspector does. But what’s the correct way?
thanks but every now and then HOLD THE CAMERA STILL !