Exterior Insulation Under Siding

How to install rigid foam under siding.

Exterior insulation under siding.

I thought i should show why continuous foam under the exterior siding is so important. A continuous layer of insulating sheathing applied to the exterior surface of a wall will minimize condensation and moisture levels. As many things in building science go you my dear reader have to learn something. Condensation and elevated moisture levels cause rot mold and mildew.

Continuous insulation under new siding has become a popular way to improve energy efficiency on an existing home because it addresses a problem known as thermal bridging. Many houses built today have a double wall type of insulation with fiberglass batts fastened between the studs on the inside and rigid foam board over. We will be residing the cabin this summer and are wondering if adding 1 inch of xps rigid insulation on the exterior walls and walk out will cause any moisture issues. We will start with hot climates.

The upper part of the cabin has standard batting and no form of exterior insulation under the siding. The insulation itself can be up to 1 25 inch thick at its thickest point but due to the stepped profile much of the insulation is thinner. The insulation is glued in place for a permanent connection. I get asked if this or that in the in the cavity works as well as foam under the siding.

It also serves as an air barrier. Installing foam insulation under vinyl siding is a wise choice for homeowners who are seeking to protect their homes against moisture infiltration as well as improve energy efficiency. If the exterior wall sheathing is below the dew point temperature condensation will form on the sheathing. Why insulation under the siding is important.

Most homes in the united states are built with traditional wood frame construction with studs every 16 on center. Generally referred to as rigid foam insulation this type of foam insulation is. The lower level has 2 in of xps rigid foam insulation on the interior walls. Insulation under siding not necessary have a contractor who just started vinyl siding on my house built in 1927.

He removed the old aluminum siding and starting putting up the new vinyl over what looks like tar paper and 2 layers of shingle. By glenn hooper june 2 2015.