Attic Foil R Value

R values for reflective insulations are dependent.

Attic foil r value.

This might surprise you but radiant barrier foil on its own has no r value. This works to slow conductive heat. A tennessee valley authority study based on radiant barriers used in the summer found that. Radiant barrier on its own has no r value.

26 wide perforated double sided radiant barrier foil for trusses. Studies have found the following about radiant barriers to be true. The higher the r value the more resistant a material or building assemblage is to conductive heat transfer. What is the r value of your radiant barrier.

More information about r value and radiant barriers. 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. Atticfoil works to block radiant heat 97 coming in to the attic by stapling it to the rafters but it has no r value. Existing 3 4 inches of insulation.

48 wide perforated double sided radiant barrier foil best selling. This is important to understand because radiant barrier does not take the place of traditional insulation fiberglass cellulose etc. Recommended insulation levels for retrofitting existing wood framed buildings. Products 60 48 26 rolls.

Standard foam board by dow chemical or owens corning has a known r value of between 5 and 6 per inch. Most are about a thick or less. Traditional attic insulation has r value. Let s take a look at the actual r value of eshield solarguard prodex and bubble foil products.

Reflectix can provide verification for all r values stated for all products and applications. Air inherently has an r per inch value of 5 6 and is an excellent insulator when radiation and convection are controlled. In summary you increase the r value of your existing insulation by installing a radiant barrier foil insulation product. You can achieve better thermal performance in your attic by adding an additional layer of insulation.

What about r values for a reflective insulation and why do they vary with application. Achieving greater r values in exterior walls. An r 13 batt of fiberglass insulation is 3 5 thick.