Updating an old concrete carport
Updating an old concrete carport - bbw dating personals
As the spray foam expands, it will tend to push against the asphalt felt, reducing the depth of the air space.But the asphalt felt has a rough texture, and it will be wrinkly enough to provide a little bit of an air gap, even when compressed by the spray foam.
The conservative approach (assuming that most of the stud bay will be filled with air-permeable insulation) is to make sure that the rigid foam meets the minimum recommendations mandated by code for this type of assembly.EPS insulation is classified by type: Type I is lowest in density and strength and Type X is highest. EPS is somewhat vapor-permeable (as long as the foam doesn’t have a foil facing or a polyethylene facing); one inch of unfaced EPS has a permeance of 2.0 to 5.8 perms.The idea behind this approach is that if the stud bays get a little damp during the winter, the moisture will be able (slowly) to dry to the exterior. Highly insulating, water-resistant rigid foam insulation that is widely used above and below grade, such as on exterior walls and underneath concrete floor slabs.This layer can be building paper, housewrap, or even a fluid-applied material.There are several possible ways to insulate this type of wall.In most cases, this type of wall is designed to dry to the interior, so you don’t want to install any polyethylene on the interior side of the wall.
If your local code official insists on an interior vapor retarder, install a “smart” vapor retarder (one with variable permeance) like Mem Brain.Polyisocyanurate foam is usually sold with aluminum foil facings.With an R-value of 6 to 6.5 per inch, it is the best insulator and most expensive of the three types of rigid foam.No matter what type of insulation you choose, though, you need to create an air space between the back of the siding and the insulation.(For more information on the benefits of having an air space behind siding, see All About Rainscreens.) If you’re planning on filling the stud bays with air-permeable insulation (fiberglass batts, blown-in fiberglass, mineral wool, or cellulose), the material you use to create the air space (in most cases, a layer of rigid foam) needs to be an Building assembly components that work as a system to restrict air flow through the building envelope.Air barriers may or may not act as a vapor barrier.