Roof U Value Calculation Example

We provide u value calculations to show compliance with current building regulations standards and best practice.

Roof u value calculation example.

Thermal bypass as well as extra materials such as mortar joints. 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. More accurate calculations will involve extra data including loss through thermal bridging. The easiest way of getting a u value calculation is by using our free online u value calculator.

U value requirement roof 0 13 w m k. U value requirement opaque doors 1 0 w m k. 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.

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. How to use u values. To calculate the u value of a building element such as a wall floor or roof you. For more information see our articles and how to videos below.

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. For this a sap calculation for housing or an sbem procedure for non domestic work is obligatory. 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. Tectum inc roof deck thermal calculations and the difference between r values and u values explained by wayne chester.

U value requirement semi glazed doors 1 2 w m k. Below is an example of how to calculate a rough u value of a typical uk cavity wall though with a 100mm cavity. Calculating a building element s u value.