Roof U Value Calculation Example

The easiest way of getting a u value calculation is by using our free online u value calculator.

Roof u value calculation example. To calculate the u value of a building element such as a wall floor or roof you. Without knowing the u value of a wall or a floor or roof you won t know how energy efficient the whole building will be. These can be supported with a detailed report. U value requirement roof 0 13 w m k.

For example when building in dubai a roof in a villa has a recommended best starting point of a u value of 0 30w m 2 k. We provide u value calculations to show compliance with current building regulations standards and best practice. 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. There are a few good u value calculators online that if you are short on time are worth checking out.

Thermal bypass as well as extra materials such as mortar joints. Below is an example of how to calculate a rough u value of a typical uk cavity wall though with a 100mm cavity. U value requirement opaque doors 1 0 w m k. For this a sap calculation for housing or an sbem procedure for non domestic work is obligatory.

U value requirement semi glazed doors 1 2 w m k. More accurate calculations will involve extra data including loss through thermal bridging. How to use u values. As part of this process the build up of any external construction element must be specified and from this its u value can be derived.

U value requirement windows whole window u value 1 4 w m k. 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. U value has an inverse relationship to r value.