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
rot?

Thanks
TP

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.
"TP" wrote in message
...
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 rot?

Thanks
TP

No wrote:
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.
"TP" wrote in message
...

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 rot?

Thanks
TP




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...

TP wrote:
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 rot?

Thanks
TP


Has anyone used this airkrete stuff?
http://www.airkrete.com/index.html I remember seeing DIY
gallons you get pour together and make this foam. maybe that
would seal up this floor space. Any opinions?

"TP" wrote in message
...
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 rot?

Thanks
TP

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.