Basement Rigid Foam Insulation R Value

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. 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. Your choice really comes down to blanket insulation aka fiberglass or xps.

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Because of this i often get questions about which type of foam board insulation to use and what r values these products provide.

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. It provides an r value of 4 per inch of thickness and is the cheapest type of foam board insulation. All purpose foam panel insulation for masonry and other applications. Rigid insulation is one of the best tools to reduce your energy costs.

Rigid foam insulation packs a lot of r value into a thin package but not all rigid foam performs the same. You can even place it under the foundation slab. In between eps foam and xps foam the other main alternatives. Let s take a look.

Is rigid foam insulation the right insulation for your basement. There are three basic foam insulation board products on the. 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. It has an r value of r 4 per in.

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. They keep your home at a comfortable temperature without the need to crank your heat. 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. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation.

Rigid foam insulation also known as insulating boards provide high r values. Install it anywhere from the roof to the foundation. This foam board insulation is the rigid pink or blue panels that can be found at home centers in many different thicknesses. Foil faced polyiso board polyisocyanurate will give the highest r value at about r 6 per inch.

Fiberglass insulation is less than half the price of rigid foam insulation when calculated by r value per square foot. Foam board insulation types. Most homes use fiberglass but rigid foam insulation although more costly offers a few extra features. This is very common mainly because it is very cost effective.

Eps is used under roofing over foundation walls and beneath siding. Owens corning s patented hydrovac process technology makes the unique closed cell structure of foamular extruded polystyrene.

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