Attic Foil R Value

48 wide perforated double sided radiant barrier foil best selling.

Attic foil r value.

Products 60 48 26 rolls. This works to slow conductive heat. Reflectix can provide verification for all r values stated for all products and applications. More information about r value and radiant barriers.

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. The higher the r value the more resistant a material or building assemblage is to conductive heat transfer. Studies have found the following about radiant barriers to be true.

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. You can achieve better thermal performance in your attic by adding an additional layer of insulation. In summary you increase the r value of your existing insulation by installing a radiant barrier foil insulation product.

This is important to understand because radiant barrier does not take the place of traditional insulation fiberglass cellulose etc. 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. Traditional attic insulation has r value. R value is attributed to materials slowing conductive heat.

R values for reflective insulations are dependent. An r 13 batt of fiberglass insulation is 3 5 thick. Recommended insulation levels for retrofitting existing wood framed buildings. What about r values for a reflective insulation and why do they vary with application.

A tennessee valley authority study based on radiant barriers used in the summer found that. Existing 3 4 inches of insulation. What is the r value of your radiant barrier. Let s take a look at the actual r value of eshield solarguard prodex and bubble foil products.

26 wide perforated double sided radiant barrier foil for trusses. Achieving greater r values in exterior walls. Air inherently has an r per inch value of 5 6 and is an excellent insulator when radiation and convection are controlled.