A contractor I’m working with has recommended installation of drywall prior to pouring of lightweight concrete on a custom wood-framed house currently under construction. Seems like a bad idea for a number of reasons…Anyone have any personal experiences with this method?
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Seems like the drywall would suck water right out of the concrete, unless your bottom sheets are all green-board. I always thought you should nail blocking on the soleplate between the studs up past the top of the slab; enough to give nailing and backing for the bottom edge of the drywall and maybe for an expansion strip between the slab and the wall.
I'm not an expert in this matter though.
There are a thousand hacking at the branches of evil to one who is striking at the root. -- Henry David Thoreau
He wants to do that so that he doesn't have to build all the dams to contain the gypcrete.... or the added expense and labor of using a ledger... He's just taking a short cut...
A wood ledger to match the tickness of the rock covered with 15# felt proud of your finished poured elevation is the best way. Pouring to the rock is asking for problems even if you shield it. The problems of mold and mildew will surface after your contractor has left the building...
Fold the felt so that it layts on the floor and then goes up the wall.. Use just enogh staples to hold into place.. Cutting away any felt that is showing above the gypcrete is cake and pie.
Protect yur rock... You can hang, finish and prime the rock to the top of the ledger before the pour if you like...
Gypcrete is soft and doesn't wear well. Sealers are available to help you out here. It's easier and more gooder to cover the floor with 1/8" sheet goods or HD cardboard taped into place including the seams.. Sealers and sheet goods radicaly reduce cure times and keep the MC up. Make sure you do a MC test before installation of final flooring...
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