Insulation Between Osb And Siding

Below are some of the design details along with the benefits.

Insulation between osb and siding. The foam insulation and vinyl siding are permanently adhered together creating one complete durable panel. 3 benefits of rigid foam sheathing. More effective insulation with r values ranging from 3 6 to 8 0 rigid foam sheathing has much better insulation per inch than other materials i e. Plywood passes moisture better than osb redistributes moisture better than osb and dries much faster when it gets wet.

This graph helps explain why. Foam is less permeable to water vapor and the back of the siding stays wet as the face of the siding dries. As a result the siding cups cracks and sheds paint. Installing foam board insulation under vinyl siding today more than ever before homes are being built with foam board insulation installed on the outside of the sheathing and under the siding.

Wood siding needs an air space between its backside and the face of foam sheathing. And a material cost of 100 for 500sq ft for a total of 590 professionally installed or 100 for a diy installation. How to install rigid foam under siding. Notice the difference between the wet cup and dry cup tests.

Plywood has an r value of 1 25 and fiberglass batts have an r value of 3 14. And the huge difference at the end of the scale when things are really wet. This detail is used with both new construction and also with renovation work. Hot sun can overheat wood siding causing it to dry excessively and crack.

It can be installed at a rate of roughly 75sq ft. 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. Oriented strand board cost osb costs roughly 6 a sheet of 4 x 8 sheathing. In addition to providing high performance and continuous insulation it helps to increase the structural rigidity of the building.