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Cover a concrete garage floor with plywood?

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Forum topic by Brett posted 06-27-2011 06:23 PM 2615 views 0 times favorited 5 replies Add to Favorites Watch
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Brett

636 posts in 1426 days


06-27-2011 06:23 PM

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 (online now)

chrisstef

11444 posts in 1750 days


#1 posted 06-27-2011 06:43 PM

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

7821 posts in 2391 days


#2 posted 06-27-2011 06:44 PM

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

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rustfever

639 posts in 2054 days


#3 posted 06-27-2011 06:45 PM

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

323 posts in 1663 days


#4 posted 06-27-2011 06:51 PM

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

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

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newbiewoodworker

668 posts in 1570 days


#5 posted 06-28-2011 01:05 AM

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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