Exterior House Insulation Under Siding

By glenn hooper june 2 2015.

Exterior house insulation under siding.

Insulation must allow moisture to wick to the outside without losing insulating integrity. Installation of this insulation type under fiber cement siding can create an incredible 600 more energy efficient home. Drill holes in the sheathing and blow insulation into the empty wall cavity before installing the new siding and. Why insulation under the siding is important.

I thought i should show why continuous foam under the exterior siding is so important. Replacing siding and upgrading insulation should increase your home s energy efficiency. Add r5 to r6 insulative wall sheathing beneath the new. In fact you can check if it is a correct insulation installation by pressing on the house siding.

Add r5 insulative wall sheathing beneath the new siding. The r value of the insulation measures how well the insulation resists the flow of heat through it and the same with the siding. Flat board insulation 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. R values of all the insulations and the siding are added together for a resulting r value.

If the exterior wall sheathing is below the dew point temperature condensation will form on the sheathing. The r value is your guideline. By filling the voids behind the siding s stepped profile the insulation makes the complete material stiffer and more resistant to warping and movement than conventional vinyl siding. By installing insulation on the outside of the framing it causes the location of the dew point to move to the outside of the wall assembly.

The insulation also adds some r value or insulating quality to the siding. In the end the decision to install house wrap under your siding is a personal one that you should make after discussing it with your contractor. A continuous layer of insulating sheathing applied to the exterior surface of a wall will minimize condensation and moisture levels. However if you re interested a residing project offers the perfect time to examine your home s weather barrier and exterior insulation and improve it if need be.

Wall insulation whenever exterior siding is removed on an. This reduces the likelihood of condensation within the wall cavity. I get asked if this or that in the in the cavity works as well as foam under the siding. Most homes in the united states are built with traditional wood frame construction with studs every 16 on center.

To be completely efficient this insulation type has to mold perfectly with the inside of your home siding. Condensation and elevated moisture levels cause rot mold and mildew.