jms1058
Member
I am not a concrete guy but I am looking to pour a floating concrete slb for a shop 20 X 40. What should I puit down for a base?
Thanks Jim
Thanks Jim
A good bed (6") or crushed stone such as 3/4" minus or D-1 and a layer of 2" blue board (insulation)
(probably no more ignorant than CM1995 though, which makes me feel some better. )
The 2" blue board is a good way to go. Tape the seems with TYVEK brand tape, this will turn that blue board into a sealed vapor barrier, two birds with one stone.
The only thing that sucks with vapor barriers is all the moisture in the concrete when it is curing has to go through the top. It makes finishing a little more of a pain in the rear.
Just a suggestion - I would put #4 (1/2") rebar on a 4'x4' or smaller grid across the slab with #9 wire mesh sheets on top of the grid. (I prefer the wire mesh sheets instead of the rolls, easier to work with.) Placing the mesh sheets on top of the rebar grid keeps it up in the slab where it needs to be. Use some concrete bricks (not clay bricks they wick water) to hold the rebar off the bottom of the slab.
If you are going to that extreme,