07-13-2016, 10:14 AM
I would say that the wall is an issue if it is in direct sunlight. So for the walls the issue starts with exposure. Yard trees, a large roof eave could make direct sun on the walls a minor issue. If you have walls in direct sunlight I would recommend applying about 1" of foam sheeting insulation under the exterior skin.
Roof would be assumed to be in direct sunlight more than walls. So I would recommend either sheet insulation on top of the trusses/rafters or strips of non-conductive material (plastic) on the rafters/rafters.
I had a project in Joshua Tree years ago where we did the walls with R-30 ICF. That was our subcontract - ICF walls. It was a HUD job. Later the builder called complaining about the houses being sweat boxes. "What was going on?" Went in with a thermal imaging device. They walls were all cool. The ceiling looked like a fired up radiator. The steel framers installed un-decoupled steel trusses. Anyway, they had to add tons of air conditioning. All the benefits of the ICF were lost to poor thinking on the steel framing.
Roof would be assumed to be in direct sunlight more than walls. So I would recommend either sheet insulation on top of the trusses/rafters or strips of non-conductive material (plastic) on the rafters/rafters.
I had a project in Joshua Tree years ago where we did the walls with R-30 ICF. That was our subcontract - ICF walls. It was a HUD job. Later the builder called complaining about the houses being sweat boxes. "What was going on?" Went in with a thermal imaging device. They walls were all cool. The ceiling looked like a fired up radiator. The steel framers installed un-decoupled steel trusses. Anyway, they had to add tons of air conditioning. All the benefits of the ICF were lost to poor thinking on the steel framing.
Assume the best and ask questions.
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