Insulation Between Osb And Siding

Foam is less permeable to water vapor and the back of the siding stays wet as the face of the siding dries.

Insulation between osb and siding. This detail is used with both new construction and also with renovation work. Wood siding needs an air space between its backside and the face of foam sheathing. Plywood passes moisture better than osb redistributes moisture better than osb and dries much faster when it gets wet. This graph helps explain why.

By adding a layer of contoured foam insulation that completely fills the gap between the siding and the wall the impact of the panel significantly improved. Below are some of the design details along with the benefits. 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. 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.

Notice the difference between the wet cup and dry cup tests. The foam insulation and vinyl siding are permanently adhered together creating one complete durable panel. It can be installed at a rate of roughly 75sq ft. Plywood has an r value of 1 25 and fiberglass batts have an r value of 3 14.

An hour by a skilled contractor for an installation cost of roughly 490 for 500sq ft. In addition to providing high performance and continuous insulation it helps to increase the structural rigidity of the building. Hot sun can overheat wood siding causing it to dry excessively and crack. 3 benefits of rigid foam sheathing.

Isobrace osb combines the insulation performance of an expanded polystyrene panel with the rigidity of a 7 16 oriented strand board osb. 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. 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.