Rigid Foam Insulation Under Sheathing

Updated on july 20 2015.

Rigid foam insulation under sheathing. Eps is used under roofing over foundation walls and beneath siding. This foam board insulation is the rigid pink or blue panels that can be found at home centers in many different thicknesses. 3 benefits of rigid foam sheathing. Rigid foam board under sheathing i m new here great site.

It is offered in multiple thicknesses and dimensions in both square edged and tongue and groove joints. Below are some of the design details along with the benefits. Plywood has an r value of 1 25 and fiberglass batts have an r value of 3 14. It provides an r value of 4 per inch of thickness and is the cheapest type of foam board insulation.

They keep your home at a comfortable temperature without the need to crank your heat. Install it anywhere from the roof to the foundation. Insulfoam rigid foam is a high performance built to spec sheathing insulfoam rigid foam is a high performance built to spec sheathing insulation that provides superior r value and moisture resistance. Polyiso consists of a uniform closed cell polyisocyanurate foam core and provides one of the highest r values per inch of any rigid insulation.

What s the best way to install foam insulation on the outside of a wall. Foam board sheathing insulation johns manville polyiso foam sheathing insulation boards provide a continuous layer of insulation to reduce thermal bridging and improve energy efficiency. In the winter months during the heating season air will move through the wall assembly. 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.

This detail is used with both new construction and also with renovation work. You can even place it under the foundation slab. Although gba has published many articles and videos on the topic we continue to receive frequent questions from readers asking how to install rigid foam sheathing on exterior walls so it s time to provide a primer on the topic. Rigid foam insulation also known as insulating boards provide high r values.

You will want to make sure that you have enough r value in that rigid insulation so that you will not be creating a condensation point on the inside of the wall.