Floor Slab U Value Calculator

A simplified method of calculating the u value of an uninsulated floor has been described in bre information paper ip 3 90.

Floor slab u value calculator.

The quick free and easy way to find out the insulation thickness and the u value you need for your building project. Sign up to jablite updates. U value requirement windows whole window u value 1 4 w m k. Follow us on social to keep in touch with our latest tweets posts and information about eps and the insulation industry.

Depending on the use of the building the slab can then be finished ready for use or receive a screed suitable for a floor finish. U value requirement roof 0 13 w m k. Calculation of thermal transmittances. If the insulation is going below the slab the damp proof membrane dpm is laid next followed by the insulation a polythene separating layer and the concrete slab.

However the following expression can be used to compute r this equation is provided by astm c 168. A reasonable r value for a normal concrete slab can be estimated using an r value the thermal resistance per inch of thickness between 0 1 and 0 2 and multiplying it times the slab thickness. U value requirement semi glazed doors 1 2 w m k. A useful tool for designers architects and the general public to quickly calculate the u values of different elements within a building.

Building width m building length m building area m2 building perimeter m. For a 6 inch slab r value would be between 0 6 and 1 2. The u value calculator covers all the main ways of building walls flat roofs pitched roofs and floors using kingspan insulation products. A reasonable r value for a normal concrete slab can be estimated using an r value the thermal resistance per inch of thickness between 0 1 and 0 2 and multiplying it times the slab thickness.

There are a few good u value calculators online that if you are short on time are worth. Welcome to the jablite u value calculator for floors walls and inverted roofs. This simple u value calculator can help you quickly check your designs or plans to see if they are likely to achieve bs en iso 6946 2017 compliance. U value calculator version 3 70.

The formula for calculation of a ground floor u value is given in cibse guide a3 and is very complicated. Calculating the inverse of that 1 r would give you a u factor in the range of 1 67 to 0 83.