I am putting a basement apartment in my house.
Putting down a subfloor, 2x3 strapping with 1" styrofoam covered with 5/8
T&G Plywood, strapping on 16" Centers.
What would be the best to fasten the strapping to the concrete? Was
thinking first a bead of PL400 adesive glue and then renting a hilti powder
Actuated gun to put a couple of concrete nails in each 8 foot length.
Is this overkill?
I have a air powered framing nailer, would that drive the nails into the
Any insight would be appreciated.
The PL400 is the perfect tool for the job. You might buy some tapcons
and shims in case you have a low spot or need to mechanically fasten the
sleepers (the correct term for what you are calling strapping). I once
saw a detail for this method that described laying the sleepers "in a
river" of PL400. I like that term. It describes how I do it. Get the
larger tubes and a large caulk gun.
I agree with Robert on the PL400, just be sure your code does not
require PT lumber for that. In Florida all lumber in contact with
concrete must be PT. I am not sure what other areas require but it
does make good sense to do it.
I have done the exact same thing in my basement about 20 years ago. Used
cedar sleepers and ram-setted a few nails into the glued down sleepers. You
will need a variety of materials, shims for low spots, a planer to lower
high spots as concrete floors are anything but level and flat, use glue to
bond the sleepers but be sure to use Tapcon or power nailing to keep the
ends of the wood from lifting and/or warping.
It is important to keep a couple of inches clear from the walls to allow any
moisture a place to go, then leave a few channels, to the drains or sump,
clear of wood and foam so that any moisture that gets through the walls or
floor can drain away and not be trapped under the floor.
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