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Cover a concrete garage floor with plywood?

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Forum topic by Brett posted 1126 days ago 2335 views 0 times favorited 5 replies Add to Favorites Watch
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Brett

620 posts in 1283 days


1126 days ago

I’d like to cover the bare concrete floor of my workshop (located in my garage) with plywood. Can I just lay several sheets of plywood edge-to-edge on the floor, or do I need a vapor barrier underneath? Should I use pressure-treated 2×4s underneath the plywood? Any suggestions? Thanks.

-- More tools, fewer machines.


5 replies so far

View chrisstef's profile

chrisstef

10413 posts in 1607 days


#1 posted 1126 days ago

yes you will need a vapor barrier, concrete will hold moisture and slowly seep it back out again. Id go with the PT stringers underneath with a vapor barrier under those as well. The cavity may allow you to run your dust tubing and electrical underneath as well.

-- "there aren’t many hand tools as awe-inspiring as the #8 jointer. I mean, it just reeks of cast iron heft and hubris" - Smitty

View Loren's profile

Loren

7252 posts in 2248 days


#2 posted 1126 days ago

I’d elevate it. The concrete can hold and move moisture which will get
into plywood sitting on top of it. You might want to paint the concrete
with a mold-resistant paint first.

If you can handle the loss of headroom and the step up it can be cool
to run dust collection pipe and electric underneath the floor.

-- http://lawoodworking.com

View rustfever's profile

rustfever

619 posts in 1911 days


#3 posted 1126 days ago

First, a vapor barrier, lapped and sealed
Second, sleepers, pressure treated shot down to the floor
Third. prime the underside of the ply [ edges and t&G also] to further prevent moisture
Finally, ply, preferable T&G, screwed down
All seam must be loose to allow for seasonal movement
Hold back from walls about 1/2” to allow movement
Cover the 1/2” at wall with a full 3/4” thick ‘Baseboard’
Treat the floor surface to prevent dirt, stains, & moisture from entering

-- Rustfever, Central California

View Keith Fenton's profile

Keith Fenton

310 posts in 1521 days


#4 posted 1126 days ago

I always thought that most primer doesn’t protect against moisture?

-- Scroll saw patterns @ http://www.sheilalandrydesigns.com

View newbiewoodworker's profile

newbiewoodworker

668 posts in 1428 days


#5 posted 1126 days ago

Im not sure what your height requirements are, but I agree with Chris, if you can afford the height, then you may want to put in runners of maybe 4.5”(2×6 ripped) and then the TnG ply… That way you can run stretches of electrical conduit(floor electrical direct to tools) DC stretches, possibly plumbing, etc. I think if you can afford it, height wise and finanically, then you will be kicking yourself if you dont do it.

Definately put a Vapour barrier down first.

-- "Ah, So your not really a newbie, but a I betterbie."

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