U Factor Garage Door

Reference table for u values u value is the coefficient of transmission i e the transmission of heat through the materials which compose the building s envelope or outer shell.

U factor garage door. It s usually expressed in units of btu hr ft2 of. Fully insulated frame technology is the key factor for eliminating air leakage when using this type of door to seal the building envelope or enclose any climate. This involves the door section only and represents r value through the mean thickness of the section. U factor will vary between 0 66 and 1 00 depending on finish and color selection.

Nfrc ratings are determined for a fixed set of environmental conditions and a specific product size. Manufacturer stipulates that these ratings conform to applicable nfrc procedures for determining whole product performance. Fabricated of 16 gauge flush galvanized steel exterior these 2 51 mm thick doors offer an r value of 7 35. U factor represents the flow of heat through a material meaning the lower the u factor the better.

U value has an inverse relationship to r value. For example a building with material with an r value of r 11 converts to an u value of 0 09 1 r or 1 11 0 09. Keep in mind that insulated glass units are ineffective if the frame leaks air. U factor solar heat gain coefficient shgc and visible light transmittance vlt are certified by the national fenestration rating council nfrc.

By contrast u factor is a measure of thermal transmittance of heat flow. A high garage door u factor means that your garage door transfers heat easily. What is the standard r value for a garage door. Your garage door u factor measures the heat transference of your garage door or how well heat can move through the material.

For windows skylights and glass doors a u factor may refer to just the glass or glazing alone. For best u factor choose finish and color with high solar reflectance bright colors. U factor though not used as often as r value u factor is another number you may see when shopping for a garage door. Insulated sectional steel doors the insulated sectional steel door model 418 is a high quality heavy duty door that provides protection against hot and cold environments.

Below is a list of our garage doors and the r value of each one. The u factor shgc and vt factors vary and are determined by the type of glass you specify. U factor is the rate at which a window door or skylight conducts non solar heat flow. To keep your garage cool in summer or warm in winter you want a garage door with a u factor of 35 or less although the lower the u factor.