Insulating Beneath Siding

Wall 1 insulated with only r 19.

Insulating beneath siding.

3 ways to insulate siding and reduce home energy loss blown in insulation. Wall 2 insulated with high density spray foam at a nominal 4 inches in the cavity for a cavity r value of 24. As a result the siding cups cracks and sheds paint. The insulation is glued in place for a permanent connection.

To be completely efficient this insulation type has to mold perfectly with the inside of your home siding. To secure the foam use two inch cap nails. In fact you can check if it is a correct insulation installation by pressing on the house siding. Continuous insulation under new siding has become a popular way to improve energy efficiency on.

Insulated vinyl siding has an outer skin made of polyvinyl chloride or pvc just like standard vinyl siding. Apply sealant around windows doors and trim. Wall 3 r 19 in the cavity plus r6 1 foam board under the vinyl. Some people use roofing nails but if a strong gust of wind gets under the siding it may not hold.

Plastic foam traps heat and moisture beneath the siding. Fit the rigid foam insulation snugly and seal all seams with the specialized tape. Has 16 8 2 6 studs. Installation of this insulation type under fiber cement siding can create an incredible 600 more energy efficient home.

Foam is less permeable to water vapor and the back of the siding stays wet as the face of the siding dries. Wall 4 r 19 in the cavity plus r12 2 foam board under the vinyl. The nails have a plastic cap that keeps them from damaging the foam.