Glass Roof U Value

Technically u values are calculated as the amount of heat lost through one square meter of glass for every degree difference in temperature either side of the glass.

Glass roof u value. Triple glazing with 16 20mm gap 2 2. It is proposed to use mineral wool insulation between and over the joists with a thermal conductivity of 0 04 w m k. There are various ways of improving the uw value of an installation. In descending order these are typical u values for glass.

You can expect a standard double glazed panel to have a u value of around 3 w m2k whilst a triple glazed panel with xenon filled cavities and low e coatings will have a u value of around 0 4 w m2k. 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. Obviously improving the individual u factors in the calculation will improve the overall thermal performance. Determine the thickness of the insulation layer above the joists required to achieve a u value of 0 20 w m2k for the roof construction shown below.

U value has an inverse relationship to r value. Example of how u values work. 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. Double glazing with 16 20mm gap 3 0.

All insulated glass from iq is specified to this standard as a minimum.