Sheetrock Guidelines in a Basement

We got flooded with Irene....I ripped out the lower 48" of rock . Time to rebuild.

Currently, there are 2 layers of 1/2 greenboard.

- is there TRUE benefits on the greenboard/purpleboard. I'm inclined to redo it in 2 layers of firecode as I like the better dentproofness

- how HIGH should I finish it off.
1/2" Gap to the floor
2" Gap to the floor (the benefit would be that if I ever got flooded again) at least the sheetrock might not be soaking it up like a sponge with the higher gap.

The baseboard of style is 3" flatstock but I can always do 3 1/2 or 4" flatstock to offset the gap.

 

I'd leave at least 3/4 inch. Green board will only give u a small
Amount of protection for humidity. It will do nothing for a flood

 

I think 1/2" off of the floor is pretty standard, the main thing is that the drywall doesn't set directly on the floor. That protects the drywall from spills, as noted nothing will protect it from a flood.

When drywall is double laminated the joints are always staggered. That gives both more fire protection and helps to minimize any discrepancies in the framing.

 

The greenboard is mold resistant because it doesn't use paper as the face. The paper is what the mold eats and enables its growth. To further make the point about flooding, your base molding and studs will wick up water if it floods again. So you will have to open the walls to dry out no matter what.