Attic Foil R Value

The higher the r value the more resistant a material or building assemblage is to conductive heat transfer.

Attic foil r value. R value is attributed to materials slowing conductive heat. Radiant barrier on its own has no r value. Studies have found the following about radiant barriers to be true. Air inherently has an r per inch value of 5 6 and is an excellent insulator when radiation and convection are controlled.

More information about r value and radiant barriers. The higher the r value the better the thermal performance of the insulation. This might surprise you but radiant barrier foil on its own has no r value. Most are about a thick or less.

Traditional attic insulation has r value. R values for reflective insulations are dependent. Achieving greater r values in exterior walls. This is important to understand because radiant barrier does not take the place of traditional insulation fiberglass cellulose etc.

Reflectix can provide verification for all r values stated for all products and applications. In summary you increase the r value of your existing insulation by installing a radiant barrier foil insulation product. Products 60 48 26 rolls. A tennessee valley authority study based on radiant barriers used in the summer found that.

What about r values for a reflective insulation and why do they vary with application. What is the r value of your radiant barrier. Standard foam board by dow chemical or owens corning has a known r value of between 5 and 6 per inch. You can achieve better thermal performance in your attic by adding an additional layer of insulation.

This works to slow conductive heat. 48 wide perforated double sided radiant barrier foil best selling. Let s take a look at the actual r value of eshield solarguard prodex and bubble foil products. Atticfoil works to block radiant heat 97 coming in to the attic by stapling it to the rafters but it has no r value.

26 wide perforated double sided radiant barrier foil for trusses. Triple pane windows with low e surfaces perform better than a triple pane window without low e surfaces because of the reduction of radiation low emittance across the air spaces. Existing 3 4 inches of insulation.