Eps is also the most inexpensive of the three types of rigid foam insulation while also meeting the required building and energy codes.
Eps in attic.
It can be applied on the roof floor and walls and it s most widely used in structural insulated panels and insulated concrete forms.
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.
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.
Eps is made of 98 trapped air and only 2 plastic making it an efficient insulator with a small amount of raw material.
According to the epa insulating the attic could save you an average of 15 of your costs for cooling and heating your house.
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.
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.
Eps is by far the most versatile of the three rigid insulation options.
It provides an r value of 4 per inch of thickness and is the cheapest type of foam board insulation.