Eps In Attic

Use eps to increase r value in the attic within wall cavities or on the roof but avoid using this product below grade unless it s protected by a moisture resistant film or coating.

Eps in attic.

Eps is used under roofing over foundation walls and beneath siding. This is the same stuff your disposable coffee cup and is made out of and it s used to protect fragile items in their packaging. This foam board insulation is the rigid pink or blue panels that can be found at home centers in many different thicknesses. It can be applied on the roof floor and walls and it s most widely used in structural insulated panels and insulated concrete forms.

Eps is also the most inexpensive of the three types of rigid foam insulation while also meeting the required building and energy codes. In new construction the best use of eps in attics would be to put in on the exterior of the roof deck making it a conditioned attic. According to the epa insulating the attic could save you an average of 15 of your costs for cooling and heating your house. Eps is by far the most versatile of the three rigid insulation options.

To do that without creating soggy roof sheathing from wintertime moisture accumulation in us climate zone 6 you need a minimum of half the total r value to be on the exterior r25 in exterior foam out of a total code min r49. It provides an r value of 4 per inch of thickness and is the cheapest type of foam board insulation.