Insulation Between Osb And Siding

This detail is used with both new construction and also with renovation work.

Insulation between osb and siding.

The foam insulation and vinyl siding are permanently adhered together creating one complete durable panel. Plywood has an r value of 1 25 and fiberglass batts have an r value of 3 14. 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.

Below are some of the design details along with the benefits. Notice the difference between the wet cup and dry cup tests. As a result the siding cups cracks and sheds paint. In addition to providing high performance and continuous insulation it helps to increase the structural rigidity of the building.

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. 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. 3 benefits of rigid foam sheathing. Plywood passes moisture better than osb redistributes moisture better than osb and dries much faster when it gets wet.

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. This graph helps explain why. And the huge difference at the end of the scale when things are really wet. How to install rigid foam under siding.

It can be installed at a rate of roughly 75sq ft. Foam is less permeable to water vapor and the back of the siding stays wet as the face of the siding dries. Isobrace osb combines the insulation performance of an expanded polystyrene panel with the rigidity of a 7 16 oriented strand board osb. An hour by a skilled contractor for an installation cost of roughly 490 for 500sq ft.