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.
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U value requirement semi glazed doors 1 2 w m k.
U value requirement floor 0 13 w m k.
U value requirement opaque doors 1 0 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.
For a 6 inch slab r value would be between 0 6 and 1 2.
Calculation of thermal transmittances.
Calculating the inverse of that 1 r would give you a u factor in the range of 1 67 to 0 83.
Building width m building length m building area m2 building perimeter m.
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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.
The u value calculator covers all the main ways of building walls flat roofs pitched roofs and floors using kingspan insulation products.
There are a few good u value calculators online that if you are short on time are worth.
The quick free and easy way to find out the insulation thickness and the u value you need for your building project.
U value calculator version 3 70.
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.
The formula for calculation of a ground floor u value is given in cibse guide a3 and is very complicated.
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.
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.
Welcome to the jablite u value calculator for floors walls and inverted roofs.
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.