Spray Foam Attic Insulation

[John Evans]

I did refer out in the report. Thanks.

[Chuck Evans]

Looks improper to me. If they were trying to create a conditioned attic, they got it wrong. They now have two building envelopes and a recipe for condensation problems.

For conditioned attic, there must be no attic ventilation, air impermeable insulation must be applied directly to the underside of the roof sheathing, there must be NO vapor barrier between the attic and the living space (e.g., kraft backed fiberglass on the ceiling), insulation must be thick enough to maintain monthly avg temps of at least 45 degrees F on the condensing surface (underside of the foam) in your area.

Requirements are laid out in IRC 2006 R806.4

Yes leaks are hard to find - the insulation manufacturer's say that it minimizes interior damage due to leaks.

[Brian C. Hoagland]

This is a new system and is not yet fully time proven. It will be interesting to see what the future holds when reroofing of a large percentage of these is done. That installation you described is wrong, in my opinion, unless the home is constructed with the intent to install this insulation system retrofitting it in is gonna be a mistake.

[Joe Wllms]

I have applied Polyurethane Foam closed-cell insulation materials. It’s materials offer high R values, one can use a thinner foam board to have the required thermal resistance one desires. This can be extremely helpful if there are space limitations involved. This strength involved the ability of the foam to resist deformation and the ability to main its shape when forced or loaded down.It can handles a wide temperature range, which makes it effective as a roof insulation. When combined with laminated aluminum foil facing, it is also an effective moisture and vapor barrier.for the last 10 years faced no problem at all.