Help needed to ‘damp proof’ wood floor
I’ve dug out a 9′ x 9′ space under my cabin thru mostly solid rock that gets damp in the winter. Is it possible to lay a wooden floor using 2 x 4’s directly on the rock. I am trying to not have to jackhammer out any more rock. How would I waterproof the undersides of the 2 x 4’s. I don’t think I need 2 x 6’s because the rock floor is already solid. Could I put 1/2″ Hardie Backer directly on the 2 x 4’s without sheathing in plywood. Then putting on tile. This room wil mostly be used for storage or else a sleep only bedroom Thanks for creative solution
Replies
I will not be of any help to you, but I must say it sounds like you are building a dungeon. solid rock, 9 feet by 9 feet? What did your children do to you anyway?
Concrete?
Why not a concrete floor?
vp-
Could I put 1/2" Hardie Backer directly on the 2 x 4's without sheathing in plywood. Then putting on tile.
No. There's no structural value to hardie unless you lay it over something solid-continuous.
I would not put any sort of wood directly on the rock.
You need an air space under the floor. You could do this with 'hat channel'- sheet metal pieces that will raise the floor about 7/8". Use T&G subflooring that you've sealed with varnish - AND make sure there's plenty of fresh air entering the cellar. Leave a gap around the perimiter to help the space under the floor to 'vent.'
I would not put any sort of wood directly on the rock.
You need an air space under the floor. You could do this with 'hat channel'- sheet metal pieces that will raise the floor about 7/8". Use T&G subflooring that you've sealed with varnish - AND make sure there's plenty of fresh air entering the cellar. Leave a gap around the perimiter to help the space under the floor to 'vent.'
I don't get the point of installing tile.
How smooth is the rock?
You say "mostly solid rock". What's the remainder of the floor like?
You say "gets damp in the winter". What precisely do you mean by that?