Filling Joists with drywall strips : why the 1/4" space

This is a duplicate to a post I left on Ethan's site. I'm getting very close to doing this work, so I thought I would spread the joy :) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ I'm about to start filling the joists above my studio with drywall strips as suggested in Rod's book. The section shows a 1/4" air gap between the first strip of drywall and the subfloor above. Considering the two layers of drywall that form the ceiling below, doesn't the 1/4" air gap create in effect a 3 leaf system : ceiling/air/drywall strips/air/floor ? I was thinking that I should snug the strips right up against the floor? Appreciate any thoughts. Regards, Shaun

Yes, that would create a multiple leaf. Which page in Rod's book is that?

I'm looking at pgs 66-68 of Rod's book. Figs 4.19 and 4.20 clearly show that the drywall is tight to the deck above. I think what may have caused your confusion is this: "Fit the board so that it is about 1/4" from your existing floor joist, hold it in place temporarily..." pg 66. However, if you look at the sentence just before that- "... you can begin by installing gypsum board directly against the bottom of your existing deck assembly. Hope that clears things up a little. Andy

That clears it up -- thanks very much --- I don't know how many times I read that passage and was blind to what it was actually saying....luckily, I understood the principles [and had good support :) ] Now to figure out how to reduce the amount of sound travelling into the supply and return air ducts...any thoughts on that one? Best Regards, Shaun McArthur London, Ontario, Canada

read lou's studio build, here think this is exactly what you need respect and regards Iain

padded cell wrote:

read lou's studio build, here think this is exactly what you need respect and regards Iain

This is perfect. Many thanks.

snowdog99 wrote:

I'm looking at pgs 66-68 of Rod's book. Figs 4.19 and 4.20 clearly show that the drywall is tight to the deck above. I think what may have caused your confusion is this: "Fit the board so that it is about 1/4" from your existing floor joist, hold it in place temporarily..." pg 66. However, if you look at the sentence just before that- "... you can begin by installing gypsum board directly against the bottom of your existing deck assembly. Hope that clears things up a little. Andy

Thanx for clearing that up! the 1/4 gap is for the sealant (and backer rod is you wish)