Basement Rigid Foam Insulation R Value

Is rigid foam insulation the right insulation for your basement. Foil faced polyiso board polyisocyanurate will give the highest r value at about r 6 per inch. Owens corning foamular 150 extruded polystyrene insulation is ideal for wall furring perimeter foundation cavity wall crawlspace sheathing and other applications not approved for roofing.

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It provides an r value of 4 per inch of thickness and is the cheapest type of foam board insulation.

Basement rigid foam insulation r value.

Choose rigid insulation wisely and consider the effect its characteristics will have on the performance of the your project overall product cost and the best way to get the bang for your buck. All purpose foam panel insulation for masonry and other applications. Rigid foam insulation also known as insulating boards provide high r values. Owens corning s patented hydrovac process technology makes the unique closed cell structure of foamular extruded polystyrene.

Most homes use fiberglass but rigid foam insulation although more costly offers a few extra features. It has an r value of r 4 per in. 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. There are three basic foam insulation board products on the.

In between eps foam and xps foam the other main alternatives. Rigid insulation is one of the best tools to reduce your energy costs. Let s take a look. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation.

For example if you have a type of insulation that has an r value of r 5 per inch of thickness you will need a depth of 6 inches of this insulation installed in your attic to reach r 30 if you live in zones 2 or 3. If you d rather insulate on the interior and want to save space why use fiberglass insulation which only provides about r 2 5 per in. Foam board insulation types. They keep your home at a comfortable temperature without the need to crank your heat.

Your choice really comes down to blanket insulation aka fiberglass or xps. This foam board insulation is the rigid pink or blue panels that can be found at home centers in many different thicknesses. Install it anywhere from the roof to the foundation. 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.

You can even place it under the foundation slab. Fiberglass insulation is less than half the price of rigid foam insulation when calculated by r value per square foot. Eps is used under roofing over foundation walls and beneath siding. Rigid foam insulation packs a lot of r value into a thin package but not all rigid foam performs the same.

Because of this i often get questions about which type of foam board insulation to use and what r values these products provide. This is very common mainly because it is very cost effective.

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