Hi all!
long time without posting here ! good to be back..
Built my house 4 years ago, mainly out of QuadLock ICF.
Now i am having a few problems with my flat roof
and the exit room on the roof and i would need your help to make sure i don't get it wrong again.
My house is ICF + steel joists + steel deck
roof is steel deck with foam and EPDM on it
( which we just re- did after some condensation problems .. )
The small exit room on the top was done by my helper, and it is the only part of the house i had no time to do back then and i let him do it.
Now it it all rotten, even some sever mold on the outside sheating.
He did it all wrong.. air gaps everywhere, no caulking , sheating exposed all around, old style without any vap barr.
Anyhow i need to redo it once more.
I am in Quebec, Zone 6 i believe..but we get pretty cold weather all winter.
I did some extensive search,
and it seems like ICF walls with high quality concrete gets pretty impermeable to vapor,
and i've installed half inch plywood over most of the itnerior surfaces and finish will be alum composite panels which is 0.01perm or less .
So i was wondering, where can the house humidity go ??? it needs to be able to leave somehow during winter nah ??
I thought about trying to build this small
14X15ft room on the top , pretty permeable
so moisture can migrate out slowly from there during winter time ..is that thinking correct ??
Then problem is also that i wanted to have the interior walls finished in the same fashion as the first floor, with my aluminum comp panels..
:(
anyhow, after looking at all different possiblities i ended up with deciding on the following solution, and i wanted you guys to tell me what you think before i commit to anything.
Wall from interior to exterior :
1/2 ply
2X6" studs @ 24" insulated with R22 Roxul batt
5" of EPS type 1 ( i have 1600sqft that i removed from the interior ceiling ..so i shall recycle it )
1" ISOCLAD ( from www.isolofoam.com ) which is a high density 1" EPS covered with a glued tyvek
all parts caulked, glued and tapped.
I have not worked on the roof and the floor details, since i wanted to get your approval before investing time on this.
My goal in this design is to build a thermal efficient wall that will not condense
( do not wish to do this all over again )
that would easily dry to the exterior during winter and still be somewhat permeable
( the 5" EPS has a perm of ~2.5"/1inch and an R value of 3.4 .. the Isoclad as an R value of R4 i believe and around 3.5 perm )
Let me know what you guys think please !!
thanks for your time! |