zc15
Well-known member
For those with Plywood walls, what do you use to seal between each sheet edge?
Some kind of caulking or sillicone?
Some kind of caulking or sillicone?
Plywood Walls - Sealing between sheets?
- Thread starter zc15
- Start date
duneslider
Well-known member
This interior? Why do you want to seal between the sheets? What is your goal with this?
Innovate1
Well-known member
Wife wanted some thin trim on the gaps so used some primed strips from the big box store about 3/16" x 1" wide. Purely cosmetic. and will have to work around them where I put up shelves but there aren't a huge number to work around and a small notch will do it.
dcg9381
Well-known member
There are strips you can get for hardie-board, typical use is exterior. They do leave a very obvious line.
When I paneled my shop in OSB, I didn't use anything at the edges. Painted with a high quality "1 coat" paint/primer (it takes 2 coats) - it looks fine for "barndo kitchen". I did it this way so I could remove sections of the wall at any time to get back there and deal with wire/plumbing.
When I paneled my shop in OSB, I didn't use anything at the edges. Painted with a high quality "1 coat" paint/primer (it takes 2 coats) - it looks fine for "barndo kitchen". I did it this way so I could remove sections of the wall at any time to get back there and deal with wire/plumbing.
mike93lx
ALLIANCE MEMBER
If you want to air seal, you would need to tape or use some liquid, like caulking. Then you could cover with trim as desired
K'ledgeBldr
Well-known member
Air seal?
I’d use lattice. Caulk the seam heavy, finish nail/crown staple the lattice over it, clean/wipe off any ooze- done!
I’d use lattice. Caulk the seam heavy, finish nail/crown staple the lattice over it, clean/wipe off any ooze- done!
mike93lx
ALLIANCE MEMBER
Good point. I was assuming the ply was already up
Dagny
Well-known member
you don't need to.
Masheen365
Active member
I didn’t use anything. All my seams land on a stud. I butted your pretty tight, maybe a 1/16” gap. If I put anything it would be something like Alex Flex, but I don’t think it’s necessary. All of my walls are 2x4 studs, R13 insulation, 7/16” OSB, Tyvek house wrap and cap staples.
mike93lx
ALLIANCE MEMBER
I bet there are lots of leaks as you have no air sealing in what you mentioned
Leaflessshadetree
Well-known member
I left a small gap between the sheets. Didn't fill, caulk or even paint any of it. My interior "air seal" is the vapor barrier between the plywood and insulation.
I've been warned that the plywood will warp, swell and otherwise deform and won't be surprised if it happens. It was unheated for the first few years.
I've been warned that the plywood will warp, swell and otherwise deform and won't be surprised if it happens. It was unheated for the first few years.
acer66
Well-known member
T&G ply?
acer66
Well-known member
Well, that settles that then and free sheet half or not is like hitting a goldmine these days.
K'ledgeBldr
Well-known member
Not correct.
A double vapor barrier will trap moisture. Now if they were non-faced batts, you’d be Bueno!
mike93lx
ALLIANCE MEMBER
Paper isn't a vapor barrier. It is a retarder. I would. Still use unfaced though
jack stand
Well-known member
Your working on the wrong layer. Air sealing is done on the exterior wall, critical to the performance of f/g insulation.
Depends on your climate. Air seal to the warm side... which is to the interior wall when you predominantly heat your building rather than cool it.
^^^ you're mixing up vapour barrier & air sealing.
One and the same for my region. My outside got tar-paper (vapour retarder) and is built to code.
Masheen365
Active member
I guess so. I haven’t noticed. Maybe the A/C has to run a minute longer? I figure the A/C will run all summer long anyways, and my winter low only got below freezing for about 2-3 hours at a time this season.
It's still below zero here!
ducatithunder
Well-known member
I get being on a budget. If your using half sheets you could just use the screw/glue method. It would make the building alot stronger since you won't have the same shear of the 4x8 sheet. The glue on the seams should be enough to air seal. You should also be able to hit a stud. Scrap off what squeezes through. If not just put in a nailer. I did nailers on all my exterior sheathing joints as the extra 2x4 where negligible but made for a stronger wall. I used huber advantech which called for an 1/16" expansion joint between panels. If you planning on insulating prior to hanging the plywood a vapor barrier could be installed. There is also a foam version of glue that is pretty good for air seal and adhesion.
In South GA you shouldn't use anything on the interior, that's for the northern folks only!
mike93lx
ALLIANCE MEMBER
Air sealing matters everywhere.
JohnKal
Well-known member
Hell, free half sheets of plywood! In this day and age, doesn’t that qualify for a You ****?
I wouldn't use plastic/poly sheeting if you already have kraft-faced fiberglass insulation,
Even if you are using half sheets, I'd still try to stagger the seams. Then use painter's caulk to seal any gaps between the sheets.
Even if you are using half sheets, I'd still try to stagger the seams. Then use painter's caulk to seal any gaps between the sheets.
I was referring to poly or any other barrier on the interior in the south. Huge fan of air sealing and proper ventilation, I used Icynene!
buzzworth
Well-known member
$45 a sheet for 7/16" OSB, yesterday. 50 sheets...ouch. Nice score on the half sheets !
Definitely lucky. Only kicker is that the sizing isn't standard, and they were scraps from a sign company so I have to figure out the best way to cut the weird shapes out of them. Think, if somebody cut a rounded corner rectangle on 1/2 the sheet, so the portion where the round corner omits cutting out.
And like I said, not standard sizing. So I'll have to cut them into ~48x38 sizes. and plan on having 2.5 pieces high
Trapps
ALLIANCE MEMBER
Clear pine 1x3:
I did not use a caulk or other sealant, but you could easily do so.
I did not use a caulk or other sealant, but you could easily do so.