What closed-cell foam does
Closed-cell spray foam is a dense, rigid polyurethane foam with an R-value of roughly R-6 to R-7 per inch. At about 1.5 to 2 inches it also acts as a vapor retarder and adds racking strength to the assembly.
Where we use it
Metal shops, barndominiums and steel buildings where condensation on the panels is a problem; crawl spaces and rim joists; 2x4 walls and cathedral ceilings that need more R-value than the cavity depth allows; and areas exposed to moisture.
Applied in lifts
Closed-cell foam is sprayed in passes, or lifts, to the thickness the product allows per pass so it cures correctly. We check depth as we go and finish with an ignition or thermal barrier where code requires it.
Hybrid systems
A common way to control cost is a flash coat of closed-cell foam for the air and vapor seal, followed by batts, rock wool or open-cell foam for the rest of the R-value. We will price options in the bid so you can compare.
What the bid covers
- Masking and protection of adjacent surfaces
- Closed-cell foam applied in lifts to specified thickness
- Depth checks during application
- Rim joist, crawl space or metal building detailing as scoped
- Ignition or thermal barrier coating where required
- Cleanup and haul-off
Questions about closed-cell spray foam
Will closed-cell foam stop condensation in my metal building?
Applied to the panels at the right thickness, closed-cell foam keeps warm, humid air off the cold metal, which is what causes dripping. We look at the building and its ventilation during the walk.
Is closed-cell worth the higher cost?
It depends on the space. It wins where cavity depth is limited or moisture is a concern. Where depth is not a constraint, open-cell foam or a hybrid often gives the same result for less.