We have back porch built on a 4” concrete slab. I would like
to enclose it and make it a storage room. It has a 7” step down
from the house floor. I was thinking of just covering it with
plastic 6mil, putting 2x8 (and shims) across. Put some
fiberglass (Upstate NY) insulation and nail sub-floor, done.
Then I got wondering if I should vent it to my basement. What
would be the recommended way of raising this floor and avoiding
Is the purpose of the 2x8s to make the floor an equal height to the
interior? I would be more concerned about the suitability of the slab to
support the structure. Is there a suitable footer? If there is I would leave
the step down. Put pressure treated sleepers on the slab, rigid insulation
between the sleepers. I would not vent it to basement. I would make sure
that the grade will take away all water.
Yes the purpose is to equal height the floors. Also to fill the
span of 12 feet. Footers are to code. Water is not a problem. I
like the idea of rigid insulation. Expensive alternative to pink.
So just seal it up tight...
I just watched a program in Canada called Holmes on Homes and he
repairs messes contractors have made. The one I just watched was a
kitchen hardwood floor that was on it's 3rd incarnation. The problem?
Plastic on concrete below the wood floor. The plastic and the cold
below caused sweat to build up under the wood floor and ruined it.
Just a heads up.
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.