Our system eliminates all the concerns 1 through 4
So assuming I'm leaning to #3, any ideas from everyone on details?
1. Shoring on the roof--should this be done before or after floors are
put in? Leaning to bolted ledger and plywood i-joists for floors.
(i.e. shore to ground slab or 1st floor after it's built?). I know
the floor would need to be engineered for that.
- Our system is self shoring.
2. I'm leaning to extra spray foam on the main house using 2x4 furring
(easier trimming and services too). Anyone done something like building
a light subroof with i-joists, putting the ICF forms on top, and then pouring?
The i-joists would hold the sprayed insulation later. You're eliminating
an easy step, the shoring; but I'm not sure if my GC has shoring local.
Either way, it's going to be 100 miles roundtrip with it.
- Additional insulation is not really necessary, as we use the same ICF forms for the roof as we do the walls
3. I'm guessing with enough rebar at the ridge (both directions; up/down and
across) and the magic PE stamp, I can make a structural "ridge" and not
have to worry about resisting roof spreading forces (cathedral ceiling without
- Yes a stamp is necessary. Typical rod is 16” on center each way.
4. Roof details. Xypex waterproofing in concrete + EPS is barrier 1 & 2.
Tar paper or membrane on top of that? or mop on? = barrier 3
2x1 furring strips (pneumatic nails? tapcons?) and then
steel roof (the flat type with the overlapping seamed edge) = barrier 4
- Plywood with or with furring strips can be attached directly to the ICF studs. Metal roofs or clay tiles can be attached with furring strips, or even an Durarock type stucco can be used as roofing.
TICFS or Total ICF Structures are just about all we build now. We still do the occasional Icf with wood roof. We can any roof pitch above 6/12. We've poured as much as 12/12 pitch with our system and can park a truck on the roof, no worries about earthquakes.
To learn all the reasons we build ICF roofs, you can look at our website www.totalicfs.com .