Rigid Styrofoam Insulation R Value

Corrosion problems when in contact with steel roofing moisture.

Rigid styrofoam insulation r value.

Rigid insulation is one of the best tools to reduce your energy costs. Rigid foam insulation packs a lot of r value into a relatively thin package. 8 3 4 4 8 2 20. It is often used as a layer of continuous insulation on exterior walls and in the roof.

This foam board insulation is the rigid pink or blue panels that can be found at home centers in many different thicknesses. Very good air bypass leak sealing properties. Phenolic foam spray insulation. 4 8 7 21.

It provides an r value of 4 per inch of thickness and is the cheapest type of foam board insulation. Foam board insulation types. There are three basic foam insulation board products on the. Fiberglass insulation is less than half the price of rigid foam insulation when calculated by r value per square foot.

Install it anywhere from the roof to the foundation. For example insulating a 10 square foot wall area to r 15 costs about 3 40 to 4 00 with fiberglass insulation while a comparable r value for rigid foam costs roughly 10. Because of this i often get questions about which type of foam board insulation to use and what r values these products provide. You can even place it under the foundation slab.

I ve written several posts about how to insulation basement walls in which i promote the use of foam board insulation as the first line of defense against moisture and mold. Eps is used under roofing over foundation walls and beneath siding. Rigid foam insulation also known as insulating boards provide high r values. R 0 77 30 phenolic foam insulation r values.