Floor Slab U Value Calculator

U value requirement floor 0 13 w m k.

Floor slab u value calculator.

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 opaque doors 1 0 w m k. Recent changes to the building regulations have reduced the stipulated u value for floors from 0 45 to 0 25 w m k. The formula for calculation of a ground floor u value is given in cibse guide a3 and is very complicated.

U value requirement semi glazed doors 1 2 w m k. For a 6 inch slab r value would be between 0 6 and 1 2. 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. Welcome to the jablite u value calculator for floors walls and inverted roofs.

The u value calculator covers all the main ways of building walls flat roofs pitched roofs and floors using kingspan insulation products. Calculation of thermal transmittances. 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.

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. Building width m building length m building area m2 building perimeter m. There are a few good u value calculators online that if you are short on time are worth. However the following expression can be used to compute r this equation is provided by astm c 168.

U value requirement windows whole window u value 1 4 w m k. 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 calculator version 3 70. A simplified method of calculating the u value of an uninsulated floor has been described in bre information paper ip 3 90.

Follow us on social to keep in touch with our latest tweets posts and information about eps and the insulation industry. Calculating the inverse of that 1 r would give you a u factor in the range of 1 67 to 0 83.