Attic Foil R Value

Achieving greater r values in exterior walls.

Attic foil r value.

Standard foam board by dow chemical or owens corning has a known r value of between 5 and 6 per inch. A tennessee valley authority study based on radiant barriers used in the summer found that. An r 13 batt of fiberglass insulation is 3 5 thick. Most are about a thick or less.

This might surprise you but radiant barrier foil on its own has no r value. Products 60 48 26 rolls. In summary you increase the r value of your existing insulation by installing a radiant barrier foil insulation product. The higher the r value the better the thermal performance of the insulation.

This works to slow conductive heat. Traditional attic insulation has r value. Air inherently has an r per inch value of 5 6 and is an excellent insulator when radiation and convection are controlled. Let s take a look at the actual r value of eshield solarguard prodex and bubble foil products.

Existing 3 4 inches of insulation. 48 wide perforated double sided radiant barrier foil best selling. Add insulation to attic. 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.

R value is attributed to materials slowing conductive heat. R values for reflective insulations are dependent. What about r values for a reflective insulation and why do they vary with application. Recommended insulation levels for retrofitting existing wood framed buildings.

What is the r value of your radiant barrier. 26 wide perforated double sided radiant barrier foil for trusses. Studies have found the following about radiant barriers to be true. Reflectix can provide verification for all r values stated for all products and applications.

This is important to understand because radiant barrier does not take the place of traditional insulation fiberglass cellulose etc. Radiant barrier on its own has no r value. You can achieve better thermal performance in your attic by adding an additional layer of insulation.