Post 10 was plastered when he made this video. It’s nothing to lath about. All joking aside, fascinating content. Totally didn’t expect the end result.
Somehow I still feel safe in my house out of brick and concrete. The end result of Post10's tests is better than expected, by me. Fire transfer from one side to the other is usually due to wall decoration, curtains, or wall paper on the side that gets hot. Be aware that your dried flower decoration will fall down blazing on your sofa before the wall gives in.
All plaster/gypsum contains "crystalline water" and it's why it feels a bit damp when you touch it before painting. If you have in back of a heat source e. g wood stove it will slowly disappear and at last be only as powder in structure. It's also why it has a cooling effect at start at fire. It's rapid changes in pressure (flashover) that makes overheated sheetrock to crack open. Double layer (2x ½") together makes it about 4 times stronger. In a fire dividing wall with 4 layers and a non-combustible insulation between it gives 60 min fire-spread protection (and a lot of sound proofing)! *Nice to see testing this time also, Post 10! You're doing a good educational service to the viewers!*
@@Imlookingover007 You can get calcium silicate or fiber cement boards instead for higher temp resistance. Check fireclass for them. You can search for "fire rated fiber cement board". Good build to you!
anyone else want to hang out with Post10 and go on a small journey with him. Like I would love to go on a hike with the guy listen to him talk about all the stuff. Plus you could watch first hand the MAN, THE MYTH, THE LEGEND unclog a culvert.
You're right that the plaster has better mold/moisture resistance, but damn, it sure is a pain to work with lol. I live in a house build int 1902, all the walls are plaster, and it's impossible to get into them without a major hassle- or even just hang things. And you can't patch them it quick and easy like you can sheetrock. Then again... maybe the only reason my house is still standing after nearly 120 years is *because* it's built with lath and plaster!
Yea there's a good reason that most homes from the 50s and earlier have all their retrofits (ROMEX wiring, phone lines, internet, doorbell and central heat wiring, etc) run in conduit outside the walls, or along the baseboards, or fished in through existing wiring holes, or dropped through the floor into the crawlspace/basement. Plaster walls are best left how you found em, but at least they're pretty sturdy if you DO manage to mount something to them - you predrill a screw hole and it's solid, unlike drywall which will rip out if you look at it funny even with proper wall anchors.
My house is dated 1904 and has plaster and it is always much cooler in hot Summers but there are areas that need repair including the kitchen ceiling. After watching this I may try and give it a go with plaster repair and replacement.
not sure how i got here but this video was actually strangely interesting and informative. i had no idea plaster was so much more fire resistant. i learned alot about walls today
Now’s the time David to join his channel and get ready to binge watch . He is so fascinating with all his diverse and interesting content . From unclogging street drains and culverts and being the watchdog for the DOT to hikes to places where all wildlife and foliage are explained . This man is so knowledgable about so many things not to mention his menagerie of pets . You’ll be glad you clicked .
Plaster is like real silk. Stronger than steel but so fragile. I told my bf, the house we live in built in 1905 will still be standing long after his aunt’s house built in 2001.
Yes those old cartoons were spot on old houses often had large spaces inside the walls we're rats and mice would travel and also cavities reaching from the basement all the way to the top floor. This is not allowed anymore because fires can spread through those holes
So thats why my living room wall was cracked and bulging out. They didn't apply the plaster correctly and when we took it down to put in sheetrock, the lath wood had no plaster inbetween it.
I love these, I hope you continue this series of building science experiments. Would love to see a comparison of plaster and lathe with different additives. Source some horse hair and really do it old school!
Grew up in a house in the 1850's with horsehair plaster walls. I remember how the rooms were much quieter because the walls were thick. Thanks for showing us this.
[Retracted] The rain stopped, the weather map NOAA says some rain might be comming his way, in a day or two, it might move out to sea, before it gets to New Hampshire.
Well you have just answered a question I have had for years . I live in a house built in the early 1800’s . I asked my husband to help me put up a shelf . Now I come from a very practical and knowledgeable about home improvements, family . As my husband came from the polar opposite I tried to encourage him by asking for his help . I had already marked out where the screws needed to go and had drilled some pilot holes but the height and weight of the drill was too much . I did say they were pilot holes and left him to it as although I knew what to do he liked to feel he was in control. I came back when called and found out he had put in raw plugs that were obviously too big but had hammered them in then cut off the protruding excess . He asked for the screws and announced they would be too big and we obviously needed bigger holes . Now this is the bit that I still have nightmares about but daren’t ever mention . I agreed that the screws came with the shelf so they were right and maybe I hadn’t made it clear that he needed to make the pilot holes bigger to fit the raw plugs . At that point , now annoyed as he thought I was being smart mouthed , he took the drill with a now bigger drill head and proceeded to drill the holes bigger . I shouted “No! Stop , the plug is still in the hole” . He reassured me that it was fine as he blasted the plastic raw plug and the plaster , only removing the drill when a large piece fell off the wall . He slammed the drill down whilst cursing the poor quality of the plaster in this old house and stormed off never to return to the job. I left it and the conversation then one day when he went to work I bought the things needed, did the repair and put the shelf up with the help of a friend . Now I can tell him that the lats were probably not done properly in that area and maybe he might give diy another go although I don’t think my nerves could take it as he thinks I’m always doing it ‘my way’ but really it’s just how everyone else does it .
I love your channel so much! I came here for the culvert videos and have learned so much about lots of things. I love that you enjoy doing things the more naturally way instead of using computers. You show so much beautiful nature and teach us along the way. You need tons of sponsors lol. Thanks so much for sharing. I get so excited when I get a notification ... When RUclips actually sends them. I was surprised at myself that I liked the hike video so much but truly loved ever aspect of it.
For fire resistance you should take 2 sheets of plasterboard (2x 12.5 mm) with staggered seams. In ceilings adding a chicken wire between the sheets. This construction has a fire resistance of at least 60 minutes.
This is so interesting! I’ve seen two homes burn down close to us. I’m terrified of fire. We don’t have candles in the house, checking smoke detectors often, fire extinguishers and a fire blanket for the kitchen. Never can be too prepared or educated!
I learn so much from these videos. Thank you! And it was awesome to hear the harvest fly in the background at the beginning. 😊 We don't have them where i live now.
i was going to point out that pastered walls might be more expensive because the reduced demand means its not produced in amounts like it use to be but yes labor rates would kill it
Enjoyed your video. My house was built in 1880. I've done a lot of restoration work to keep it original. You taught me a few things about plastered walls. All in all I found your video very interesting. First time I heard about purple board.
The layers for plaster should be a mix of plaster and either mortar mix or cement. Next layer same after wetting, top layer is pure plaster and gets smoothed out.
Wow, cool video, bro! Really thought the sheetrock was gonna be the winner because of the wood backing of the plaster, interesting to see that the plaster in front of the wood held up so good.
Thank you for the continuing videos you keep posting. I've enjoyed everyone of them especially the ones I've learned from.👍 Every thing about your videos are filled with great content and "Spot-On " narration. After a long day working I find viewing your videos very relaxing. Stay safe my friend. Thank you!
That really is interesting, the wood and plaster are better for fire proofing and physical resistance. While the other one is better for an easy exit or break in
Old timer told me back in the day the crew putting up the lathe would bring in a 30gallon pail and they would grab a handful of nails, put them in their mouth, and dispense the nails that way.
We restored a 150 yr old house on our farm. Some of the walls were lath (wood strips) and plaster, other walls were irregular thin sheets cut from logs that were slashed, stretched while green, and nailed to the wall, then plastered. Really cool video! 😎
wow this actually helped me. my house got a hole in a wall recently and there was hair in the wall. i was thinking there was a body or a animal carcuss in there but it just is a old construction practice.
I'm thinking, that if the sheetrock wall had wallpaper, curtains, or furniture on/in front of it they would be combusted ages ago because of the radiant heat and the house had been burning away. But otherwise, this is very interesting.
Interesting, my house has plaster on a wire mesh. (Built in 1950s) Love the plaster because it's cool to the touch and it's been bashed with hockey sticks and skis hundreds of times with barely a scratch. But on the otherhand it's not too hard to put picture nails into. When we upgraded the windows we tried to patch some cracks with drywall mud and it refuses to stick to the plaster.
Wait you're an electrician too? Nice! Also really unexpected 11:13 Plaster breaks down in a few stages. First is CaSO4.2 H2O which is the starting material. It sheds some water from the structure and goes to CaSO4.1/2 H2O. That is the state of the powder in the bag. That's about 100-150C. Then some above that it goes to just CaSO4 and loses integrity. It doesn't bind anymore. If you go way higher. with the presence of sand, it creates CaSiO3 which is clinker cement and SO3 which is the 10 times angrier cousin of firework smell. Literally turns into sulfuric acid as it hits water
When I had to replaster one of my walls that I had to bust a hole into, to get to some plumbing, I used paint stirrer sticks for lath when I had to replace them.
Do they still use this lath system these days? Kind of bizarre to see as a european. Even the full wood structures actually, here it's an exterior brick layer and interior cinderblock loadbearing wall, they grind slits from the interior for electrics then plaster on top.
I had a house built in 1840. The plaster walls were built on hand split heartwood cedar lath; plaster was reinforced with horsehair. They knew how to build houses 190 years ago.
there are two kinds of plaster. One for a scratch coat then the finish plaster. one has more volume, weighs less and has more hold, then the finish coat is applied to that. typically the scratch coat has more sand in it, often called brown coat due to the horse manure added in the old day. plaster is an artform beginning with the recipe. there are various grades of drywall not all of them are fire rated. typically fire rated is X type 5/8ths thick and requires specific tape and compound to maintain it's fire rating.
@@duskeyowl2507 yes, horse hair was added but so was manure. I have read extensively on this. as i explained it's what gives the base/scratch coat it's color, some call it brown coat. Manure. Manure serves as a binding agent and gives plaster more body. Manure also contains small natural fibers that provide additional tensile strength as well as reduce cracking and water erosion. Earthen plaster - Wikipedia
Judging by the finish quality and the sheen of that pine, that looks like what we would call at Menards "Pine Lattice" which is a trim grade pine. We sell bundles of 50 strips of lath, 4' long, for $27. It is okay, I know you're not an expert and it doesn't affect the testing, but if you asked someone at a store like Home Depot or Lowes and they steered you towards this, they were mistaken. Generally plaster does cost more in the long run after you figure in the extra labor and that you have to coat the entire wall surface twice at a minimum, sheetrock/drywall is way cheaper.
Yes I did ask in this is all they had in stock so I just went with it because I know somebody would complain if I tried using like paint stirrers or some alternative like ripping a two-by-four. No it does not affect the burn test it just doesn't stick as well
Modern buildings would be as safe if the construction workers would respect the building regulations. But usually they invent a work around when facing a problem, those are the dangerous spots.
I've often seen plastic mesh being used to reinforce plaster and this makes me wonder how that would impact this test, especially when plaster is applied as a thinner layer. The plastic would certainly start melting, but would that make the plaster break off easier? 🤔 Maybe a question to be answered in a future test. 😉
I was watching videos on plaster repair and saw fiberglass, plastic and wire netting/mesh being used. I suppose it comes down to cost at the time. I wonder about plastic in the walls, too.
post i love these kind of videos (your usuals are awesome too of course) do more please!!! youre showing us what the manufactures dont want us to see :3 youre being naughty XD
Scrape off a little bit of the plaster and put glass fiber tape over them, like they use for joints in drywall. The crack will never open again, at the same spot.
We didn't see flames traveling through the walls, but the heat sure did. It was hot enough to make wood burst into flames. What would happen if you put a piece of paper on the other side of the wall? Would the fire be able to spread even if the flames didn't travel trough the wall? Igniting paper or even furniture by heat transfer alone?
I'd argue that the structural strength of older homes is more to the smaller stud bay widths (on a rough average) compared to what builders do today. For lathe and the weight of plaster, you want to have smaller distances to spread the weight out and not bend the lathe as the plaster is drying. There's also a MAJOR difference in grain-growth-patterns affect on wood used today versus yesteryear. Simply put, we have faster growing wood that we use for construction today, meaning the grain is further apart and the wood is more flexible. Old house were often built with old/older growth wood that have closer grain and are therefore stiffer. Both have advantages and disadvantages. From a pedantic engineering standpoint, an argument could be made that lathe is worse than sheetrock in terms of number of perforations/holes into the studs. More holes = less stud to hold up house, technically. Granted, we are talking about maybe at most a 5% (spitball number here) difference in area, and really nails and screws just densify the wood around them, its drilling that removes wood . . .
Both sheetrock and plaster of paris are gypsum, which is hydrated calcium sulfate. Heat dehydrates it, which is endothermic, and increases the time it takes for most of the heat to make it through the material. At no point is it ever flammable. This is why it is such a great fire-block. (Although at higher temperatures, it can liberate oxygen.) The only problem is that dehydrating it reduces its structural strength. Even asbestos fibers don't help much, because the fibers need a solid matrix to hold them in place. Once dehydrated, it crumbles to powder. The burn-through time for both is related to the thickness, because it takes time to dehydrate and crumble. Small amounts of impurities can react at high temperatures to produce sulfur dioxide, which is probably what you were smelling.
Yes it's true unless you go to a city such as Boston where it's mostly brickwork. Americans like to build stuff that is semi disposable. You should look up some videos titled American things Europeans don't understand and maybe that would interest you
Most of the time if you get a fire inside the walls it's going to travel up through the void and along pipe and/or cable runs to other parts of the building long before it burns through a wall into a room. The fire department is going to pull the wall to open up and get to the fire and to look for extension. One thing I do like about the old style lathing and plaster walls is the overall strength. Unless badly damaged that stuff is solid.
1908 house. The train has finally killed the plaster. Once it lets go of the wall or ceiling, all you can do is remove and repair. But as this was heated by coal originally, if it catches fire it’s going up like crazy due to all the coal dust
![Chino Pacas - Modo Capone (with Drake & Fuerza Regida) [Video Oficial]](http://i.ytimg.com/vi/zjv8TQ0gBkg/mqdefault.jpg)
Post 10 was plastered when he made this video. It’s nothing to lath about.
All joking aside, fascinating content. Totally didn’t expect the end result.
Somehow I still feel safe in my house out of brick and concrete.
The end result of Post10's tests is better than expected, by me.
Fire transfer from one side to the other is usually due to wall decoration, curtains, or wall paper on the side that gets hot. Be aware that your dried flower decoration will fall down blazing on your sofa before the wall gives in.
Owww. You're so punny. :)
All plaster/gypsum contains "crystalline water" and it's why it feels a bit damp when you touch it before painting. If you have in back of a heat source e. g wood stove it will slowly disappear and at last be only as powder in structure. It's also why it has a cooling effect at start at fire. It's rapid changes in pressure (flashover) that makes overheated sheetrock to crack open. Double layer (2x ½") together makes it about 4 times stronger. In a fire dividing wall with 4 layers and a non-combustible insulation between it gives 60 min fire-spread protection (and a lot of sound proofing)!
*Nice to see testing this time also, Post 10! You're doing a good educational service to the viewers!*
Excellent info. One of the keys to the 'double layer' longer fire time is offseting the joints between layers.
Damn you sure as hell know a lot about walls and shit
That is good to know. I am considering putting a little wood stove in the kitchen area. Thanks for the info everyone.
@@Imlookingover007 You can get calcium silicate or fiber cement boards instead for higher temp resistance. Check fireclass for them. You can search for "fire rated fiber cement board". Good build to you!
"If it wasn't for all the sunlight, woah look at the I'm blocking the sun" made me chuckle.
anyone else want to hang out with Post10 and go on a small journey with him. Like I would love to go on a hike with the guy listen to him talk about all the stuff. Plus you could watch first hand the MAN, THE MYTH, THE LEGEND unclog a culvert.
Me!! 🙋♀️
I think he would be an amazing like nature tour guide lol
The post 10 experience.
Yep I forth this. Fifth idk but for sure I’m only 10 hours away
Imagine going to the beach and you see him in the surf with his rake and suddenly the ocean drains.
You're right that the plaster has better mold/moisture resistance, but damn, it sure is a pain to work with lol. I live in a house build int 1902, all the walls are plaster, and it's impossible to get into them without a major hassle- or even just hang things. And you can't patch them it quick and easy like you can sheetrock. Then again... maybe the only reason my house is still standing after nearly 120 years is *because* it's built with lath and plaster!
Yea there's a good reason that most homes from the 50s and earlier have all their retrofits (ROMEX wiring, phone lines, internet, doorbell and central heat wiring, etc) run in conduit outside the walls, or along the baseboards, or fished in through existing wiring holes, or dropped through the floor into the crawlspace/basement. Plaster walls are best left how you found em, but at least they're pretty sturdy if you DO manage to mount something to them - you predrill a screw hole and it's solid, unlike drywall which will rip out if you look at it funny even with proper wall anchors.
My house is dated 1904 and has plaster and it is always much cooler in hot Summers but there are areas that need repair including the kitchen ceiling. After watching this I may try and give it a go with plaster repair and replacement.
not sure how i got here but this video was actually strangely interesting and informative. i had no idea plaster was so much more fire resistant. i learned alot about walls today
Now’s the time David to join his channel and get ready to binge watch . He is so fascinating with all his diverse and interesting content .
From unclogging street drains and culverts and being the watchdog for the DOT to hikes to places where all wildlife and foliage are explained . This man is so knowledgable about so many things not to mention his menagerie of pets . You’ll be glad you clicked .
Oh just wait till you see the culvert vids
Welcome to the cult
You'll find yourself watching the videos but never sure why. I love Post10.
I'm terrified of house fires. My mother had one when she was a kid and she raised me to be so careful with fire..... kinda paranoid, actually!
I never been in one but see em on news and in movies, and it terrifies me too, because i don't wanna loose my stuff
@@ms.pirate just check you've turned off your hair straighteners.
always becareful
@@anemone9895 LOLLLLLL I DO!!!!! 😂😂😂😂 I do straighten my hair.
@@Impassion glad to be of use
Wood prices are crazy!!!, Another great video!, Hats off to you!
I love these kinds of science experiments. They're fun to watch and educational.
Plaster is like real silk. Stronger than steel but so fragile. I told my bf, the house we live in built in 1905 will still be standing long after his aunt’s house built in 2001.
I finally understand why all those cartoon Tom & Jerry walls look like that from the inside.
Yes those old cartoons were spot on old houses often had large spaces inside the walls we're rats and mice would travel and also cavities reaching from the basement all the way to the top floor. This is not allowed anymore because fires can spread through those holes
I was thinking of the matrix scene where they are sliding down inside the walls right before Morpheus gets captured.
@@axiom1650 Oh yes, that too. Also Mousehunt has some interesting sequences.
The walls of my house look like that on the inside.
So thats why my living room wall was cracked and bulging out. They didn't apply the plaster correctly and when we took it down to put in sheetrock, the lath wood had no plaster inbetween it.
Everyday vibrations could have cracked the plaster and made it fall out. Was there much plaster dust/pieces at the bottom of the walls?
your house wants its plaster back
I love these, I hope you continue this series of building science experiments.
Would love to see a comparison of plaster and lathe with different additives. Source some horse hair and really do it old school!
I wonder if the addition of sand would slow the heat.
Grew up in a house in the 1850's with horsehair plaster walls. I remember how the rooms were much quieter because the walls were thick. Thanks for showing us this.
Post10 expanding his content 👀
[Retracted] The rain stopped, the weather map NOAA says some rain might be comming his way, in a day or two, it might move out to sea, before it gets to New Hampshire.
I really enjoy watching this guy do his thing. The culverts are the best for me. Keep up the good work.
Frankly, I'm jealous of post, being able to just do what he does
I grew up in a 1959 laugh and plaster home. Yes it would crack . As always I learned from your video. Thank you.
Now THAT was interesting. Love your play by play of the action. Cheers
Well you have just answered a question I have had for years . I live in a house built in the early 1800’s . I asked my husband to help me put up a shelf . Now I come from a very practical and knowledgeable about home improvements, family . As my husband came from the polar opposite I tried to encourage him by asking for his help . I had already marked out where the screws needed to go and had drilled some pilot holes but the height and weight of the drill was too much . I did say they were pilot holes and left him to it as although I knew what to do he liked to feel he was in control.
I came back when called and found out he had put in raw plugs that were obviously too big but had hammered them in then cut off the protruding excess . He asked for the screws and announced they would be too big and we obviously needed bigger holes .
Now this is the bit that I still have nightmares about but daren’t ever mention . I agreed that the screws came with the shelf so they were right and maybe I hadn’t made it clear that he needed to make the pilot holes bigger to fit the raw plugs . At that point , now annoyed as he thought I was being smart mouthed , he took the drill with a now bigger drill head and proceeded to drill the holes bigger . I shouted “No! Stop , the plug is still in the hole” . He reassured me that it was fine as he blasted the plastic raw plug and the plaster , only removing the drill when a large piece fell off the wall . He slammed the drill down whilst cursing the poor quality of the plaster in this old house and stormed off never to return to the job.
I left it and the conversation then one day when he went to work I bought the things needed, did the repair and put the shelf up with the help of a friend .
Now I can tell him that the lats were probably not done properly in that area and maybe he might give diy another go although I don’t think my nerves could take it as he thinks I’m always doing it ‘my way’ but really it’s just how everyone else does it .
I feel your pain!🤣
I understand and I'm sorry you had to act that way. How did he feel about you doing the repair?
If a first you don't succeed - try doing it the way your wife suggested in the first place. 👍
I love your channel so much! I came here for the culvert videos and have learned so much about lots of things. I love that you enjoy doing things the more naturally way instead of using computers. You show so much beautiful nature and teach us along the way. You need tons of sponsors lol. Thanks so much for sharing. I get so excited when I get a notification ... When RUclips actually sends them. I was surprised at myself that I liked the hike video so much but truly loved ever aspect of it.
Post 10 has videos to satisfy any audience including culvert and drain cleaning, nature videos, animal videos, and lots more
For fire resistance you should take 2 sheets of plasterboard (2x 12.5 mm) with staggered seams. In ceilings adding a chicken wire between the sheets. This construction has a fire resistance of at least 60 minutes.
That’s how we made the firewall between my attached garage and the house.
How long would fire take to get through if you attached standard 12.5mm sheet rock to a lath and plaster ceiling that was in good condition?
This is so interesting! I’ve seen two homes burn down close to us. I’m terrified of fire. We don’t have candles in the house, checking smoke detectors often, fire extinguishers and a fire blanket for the kitchen. Never can be too prepared or educated!
Don't forget to have a fire plan for exits, that everyone in home is aware of. Practice regularly
"like a desert during a drought" well said my friend this is awesome
You can explain anything that's always good to hear!
I learn so much from these videos. Thank you! And it was awesome to hear the harvest fly in the background at the beginning. 😊 We don't have them where i live now.
i was going to point out that pastered walls might be more expensive because the reduced demand means its not produced in amounts like it use to be but yes labor rates would kill it
Enjoyed your video. My house was built in 1880. I've done a lot of restoration work to keep it original. You taught me a few things about plastered walls. All in all I found your video very interesting. First time I heard about purple board.
Dude if you have not run into any of this information prior you can't have restored much more than a paint job.
The layers for plaster should be a mix of plaster and either mortar mix or cement. Next layer same after wetting, top layer is pure plaster and gets smoothed out.
Mould can grow on anything containing hydro carbons , there researching into mould and fungi to clean up oil spills.
Fantastic vid
Wow, cool video, bro!
Really thought the sheetrock was gonna be the winner because of the wood backing of the plaster, interesting to see that the plaster in front of the wood held up so good.
"You don't wanna breathe in sheet rock"
*proceeds to sniff the burning sheet rock*
it probably only affects you if you’re inhaling it for months
Thank you for the continuing videos you keep posting.
I've enjoyed everyone of them especially the ones I've learned from.👍
Every thing about your videos are filled with great content and "Spot-On " narration.
After a long day working I find viewing your videos very relaxing.
Stay safe my friend.
Thank you!
This is simply one of the most interesting channels around
Very interesting always wondered about this now I know. Thanks keep them coming.
Love the this experiment and the insulation one, I haven’t seen anyone else do this!
That really is interesting, the wood and plaster are better for fire proofing and physical resistance. While the other one is better for an easy exit or break in
Old timer told me back in the day the crew putting up the lathe would bring in a 30gallon pail and they would grab a handful of nails, put them in their mouth, and dispense the nails that way.
My favorite part was Post 10 pulling an axe out of nowhere at the end and destroying everything
This video also gives me peace that my house wont burn down fast and into other rooms fast, thanks for this experiment
Repairing horse hair plaster and lath is a chore! I found that when replacing laths, to use a wire mesh.
We did a repair using plaster buttons to reattach the plaster to the lath. House built before the 1880's.
Just as cool and informative as the last fire video. Thanks, I appreciate the knowledge👍😎
We restored a 150 yr old house on our farm. Some of the walls were lath (wood strips) and plaster, other walls were irregular thin sheets cut from logs that were slashed, stretched while green, and nailed to the wall, then plastered. Really cool video! 😎
I did not expect those results. They both lasted much longer than I thought. Thx
Great Video & experiment Post 10,
I was quite surprised at how well both materials stood up to the tests...😀👍🇬🇧
wow this actually helped me. my house got a hole in a wall recently and there was hair in the wall. i was thinking there was a body or a animal carcuss in there but it just is a old construction practice.
Thank you for the video! Very informative! Please stay safe!
Incredibly interesting, @post10. I enjoyed watching this very much.
Instead of Bill Nye the Science Guy, we have Post 10 the Experiment Guy! Loved it! Keep up the good work!
There is zero actual necessity for me to know this information, yet I was intrigued enough to watch this entire video.
I'm a single Mom living in an Apartment and have absolutely no need for any of this knowledge yet I watched and was fascinated by the entire thing. 🤪
I'm thinking, that if the sheetrock wall had wallpaper, curtains, or furniture on/in front of it they would be combusted ages ago because of the radiant heat and the house had been burning away. But otherwise, this is very interesting.
What about two layers of fire code drywall? That’s required in some areas and should easily beat the plaster and lath.
Interesting, my house has plaster on a wire mesh. (Built in 1950s)
Love the plaster because it's cool to the touch and it's been bashed with hockey sticks and skis hundreds of times with barely a scratch. But on the otherhand it's not too hard to put picture nails into.
When we upgraded the windows we tried to patch some cracks with drywall mud and it refuses to stick to the plaster.
Post 10 woke up this morning and chose combustion.
Wait you're an electrician too? Nice! Also really unexpected
11:13 Plaster breaks down in a few stages. First is CaSO4.2 H2O which is the starting material. It sheds some water from the structure and goes to CaSO4.1/2 H2O. That is the state of the powder in the bag. That's about 100-150C. Then some above that it goes to just CaSO4 and loses integrity. It doesn't bind anymore. If you go way higher. with the presence of sand, it creates CaSiO3 which is clinker cement and SO3 which is the 10 times angrier cousin of firework smell. Literally turns into sulfuric acid as it hits water
When I had to replaster one of my walls that I had to bust a hole into, to get to some plumbing, I used paint stirrer sticks for lath when I had to replace them.
Would love to see the difference in 1/2” and 5/8”
Do they still use this lath system these days? Kind of bizarre to see as a european. Even the full wood structures actually, here it's an exterior brick layer and interior cinderblock loadbearing wall, they grind slits from the interior for electrics then plaster on top.
I had a house built in 1840. The plaster walls were built on hand split heartwood cedar lath; plaster was reinforced with horsehair. They knew how to build houses 190 years ago.
Thank you very much for this very interesting and informative video.
there are two kinds of plaster. One for a scratch coat then the finish plaster. one has more volume, weighs less and has more hold, then the finish coat is applied to that. typically the scratch coat has more sand in it, often called brown coat due to the horse manure added in the old day. plaster is an artform beginning with the recipe.
there are various grades of drywall not all of them are fire rated. typically fire rated is X type 5/8ths thick and requires specific tape and compound to maintain it's fire rating.
It was not horse manure added it was horse hair.
@@duskeyowl2507 yes, horse hair was added but so was manure. I have read extensively on this. as i explained it's what gives the base/scratch coat it's color, some call it brown coat.
Manure. Manure serves as a binding agent and gives plaster more body. Manure also contains small natural fibers that provide additional tensile strength as well as reduce cracking and water erosion.
Earthen plaster - Wikipedia
I like these experiments. If you know more ideas you want to share, I'm eager to watch/listen :-)
Greets from
Eindhoven, Brabant, the Netherlands
He could have tested a brick and a concrete wall... just to compare.
Greets from
's-Hertogenbosch, Brabant, the Netherlands
Judging by the finish quality and the sheen of that pine, that looks like what we would call at Menards "Pine Lattice" which is a trim grade pine. We sell bundles of 50 strips of lath, 4' long, for $27. It is okay, I know you're not an expert and it doesn't affect the testing, but if you asked someone at a store like Home Depot or Lowes and they steered you towards this, they were mistaken. Generally plaster does cost more in the long run after you figure in the extra labor and that you have to coat the entire wall surface twice at a minimum, sheetrock/drywall is way cheaper.
Yes I did ask in this is all they had in stock so I just went with it because I know somebody would complain if I tried using like paint stirrers or some alternative like ripping a two-by-four. No it does not affect the burn test it just doesn't stick as well
Now I can check "practice burning a wall" off of my To Do List. Good experiment!
Good things to know!
Thanks for sharing
This content is the stuff I'll be super interested in for some reason
Really cool shot from behind you did of you putting on the plaster
Wonderful experiment
Great video. Always look forward to your stuff.
Good one with the anti theft marking
Neat stuff. Older buildings last longer. Ones now are cheaply built. Interesting comparison. Thanks for sharing and stay safe.
Modern buildings would be as safe if the construction workers would respect the building regulations. But usually they invent a work around when facing a problem, those are the dangerous spots.
i'm glad we got to see total destruction at the end
Suggestion: by one of those thermometer guns and point it at the burn area to show us the temperature. (both in C and F, for convenience)
Thanks for the tutorial. Be safe
I've often seen plastic mesh being used to reinforce plaster and this makes me wonder how that would impact this test, especially when plaster is applied as a thinner layer. The plastic would certainly start melting, but would that make the plaster break off easier? 🤔
Maybe a question to be answered in a future test. 😉
I was watching videos on plaster repair and saw fiberglass, plastic and wire netting/mesh being used. I suppose it comes down to cost at the time. I wonder about plastic in the walls, too.
how the fuck did i end up here? I was watching some dude clear up flooded shit. Wait, this is the same guy? whatever, subscribed.
Is this a spoof? Why are you using plaster of paris? That's for making models and craft.
post i love these kind of videos (your usuals are awesome too of course) do more please!!! youre showing us what the manufactures dont want us to see :3 youre being naughty XD
My house has several rooms that have old plaster walls. It took a lot of work to fix some of the cracked walls. That was a good test.
Scrape off a little bit of the plaster and put glass fiber tape over them, like they use for joints in drywall. The crack will never open again, at the same spot.
We didn't see flames traveling through the walls, but the heat sure did. It was hot enough to make wood burst into flames. What would happen if you put a piece of paper on the other side of the wall? Would the fire be able to spread even if the flames didn't travel trough the wall? Igniting paper or even furniture by heat transfer alone?
You should have also done gypsum brick/block, and wire lathe plaster, for thoroughness
I'd argue that the structural strength of older homes is more to the smaller stud bay widths (on a rough average) compared to what builders do today. For lathe and the weight of plaster, you want to have smaller distances to spread the weight out and not bend the lathe as the plaster is drying.
There's also a MAJOR difference in grain-growth-patterns affect on wood used today versus yesteryear. Simply put, we have faster growing wood that we use for construction today, meaning the grain is further apart and the wood is more flexible. Old house were often built with old/older growth wood that have closer grain and are therefore stiffer. Both have advantages and disadvantages.
From a pedantic engineering standpoint, an argument could be made that lathe is worse than sheetrock in terms of number of perforations/holes into the studs. More holes = less stud to hold up house, technically. Granted, we are talking about maybe at most a 5% (spitball number here) difference in area, and really nails and screws just densify the wood around them, its drilling that removes wood . . .
Both sheetrock and plaster of paris are gypsum, which is hydrated calcium sulfate.
Heat dehydrates it, which is endothermic, and increases the time it takes for most of the heat to make it through the material.
At no point is it ever flammable. This is why it is such a great fire-block. (Although at higher temperatures, it can liberate oxygen.)
The only problem is that dehydrating it reduces its structural strength. Even asbestos fibers don't help much, because the fibers need a solid matrix to hold them in place. Once dehydrated, it crumbles to powder.
The burn-through time for both is related to the thickness, because it takes time to dehydrate and crumble.
Small amounts of impurities can react at high temperatures to produce sulfur dioxide, which is probably what you were smelling.
I totally thought the lathe was going to catch the entire structure on fire. You should become a volunteer firefighter!
Fun times out in the yard!!
Your a good man post love these videos! Have a great day man
Usually, there are two coats done with plaster. A sand mixture is put down first and plaster is used over it.
Interested in what grade of Sheetrock you are using for the comparison, Thickness, Fire Rating etc.
Do you guys paint straight over the plaster board? Here we put plaster on top of everything
I’m not from America but is it true that almost all of the houses in the USA are mainly made of wood and not bricks?
Yes it's true unless you go to a city such as Boston where it's mostly brickwork. Americans like to build stuff that is semi disposable. You should look up some videos titled American things Europeans don't understand and maybe that would interest you
Brick and rock are less structural (where I live in the US at least) and more facade.
older houses around here in Iowa do use a wire mesh in the walls but typically only on the walls of the staircases.
I feel like i got a college degree watching this. Thanks!!!
Wonder the result with full paint, which one would combust paint faster?
Love the video post 10.
Awesomeness !!
Thanks for the heart post 10 , ❤️ back at ya
Most of the time if you get a fire inside the walls it's going to travel up through the void and along pipe and/or cable runs to other parts of the building long before it burns through a wall into a room. The fire department is going to pull the wall to open up and get to the fire and to look for extension. One thing I do like about the old style lathing and plaster walls is the overall strength. Unless badly damaged that stuff is solid.
Que bueno lo que mostraste Exelente !!!
Nice! Loved the last video like this one as well
1908 house. The train has finally killed the plaster. Once it lets go of the wall or ceiling, all you can do is remove and repair. But as this was heated by coal originally, if it catches fire it’s going up like crazy due to all the coal dust