U Factor Garage Door

This involves the door section only and represents r value through the mean thickness of the section.

U factor garage door.

For best u factor choose finish and color with high solar reflectance bright colors. U factor will vary between 0 66 and 1 00 depending on finish and color selection. Manufacturer stipulates that these ratings conform to applicable nfrc procedures for determining whole product performance. What is the standard r value for a garage door.

Keep in mind that insulated glass units are ineffective if the frame leaks air. It s usually expressed in units of btu hr ft2 of. For windows skylights and glass doors a u factor may refer to just the glass or glazing alone. By contrast u factor is a measure of thermal transmittance of 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. U factor represents the flow of heat through a material meaning the lower the u factor the better. U factor though not used as often as r value u factor is another number you may see when shopping for a garage door. 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.

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. A high garage door u factor means that your garage door transfers heat easily. 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 is the rate at which a window door or skylight conducts non solar heat flow.

U value has an inverse relationship to r value. Fabricated of 16 gauge flush galvanized steel exterior these 2 51 mm thick doors offer an r value of 7 35. U factor solar heat gain coefficient shgc and visible light transmittance vlt are certified by the national fenestration rating council nfrc. Nfrc ratings are determined for a fixed set of environmental conditions and a specific product size.

Nfrc u factor ratings however represent the entire window performance including frame and spacer material. U factor units are btu hour x ft x f to determine thermal properties as applied to a garage door there are two methods for consideration. 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.