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Free, Online U-Value Calculator
Our U-Value calculator is a free, online tool which will help calculate the required thickness of insulation to achieve the desired U-Value.
The calculator can be used to calculate U-Values for floor, wall, pitched roof and flat roof insulation applications.
There is a wide range of calculations available in the U-Value calculator which can be emailed directly to your inbox.
The Information You Will Need
To complete your U-Value calculation, you will need to have the following information:
Wall Insulation Calculations
- Full construction build-up of wall construction from outside to inside
- Type of wall construction e.g. cavity wall, timber frame, steel frame
- The desired U-Value you want to achieve, if known
Floor Insulation Calculations
- Perimeter area ratio. This is calculated by dividing the total exposed perimeter in meters (m) by the intended insulated floor area
- Floor construction type, e.g. suspended floor, solid ground floor
- Full construction make-up of the floor, e.g. 75mm screed, vapour control layer, 150mm insulation, ground floor slab, etc.
- The desired U-Value you want to achieve, if known
Roof Insulation Calculations
- Type of roof construction e.g. pitched roof or flat roof
- Construction make-up of the roof including joist/rafter info
- The desired U-Value you want to achieve, if known
- If the roof is a ventilated or unventilated system
U-Values
A U-Value is a measure of the heat loss through a building element. Otherwise known as thermal transmittance, it’s the rate at which heat transfers through a building element and is expressed as W/m 2K.
U-Values are used in construction to measure the effectiveness of the building’s envelope in preventing heat loss. Elements with lower U-values lose less heat. Building Regulations set a maximum permitted U-value for each element which must be matched or improved upon.
Calculating U-Values can be a complex process, so as well as our U-Value calculator, we have provided a number of U-Value calculations for our insulation products, which can be found on our Insulation Applications pages. Using our U-Value calculator will also allow you to calculate the U-Values for your specific construction project quickly and easily.
What thickness of insulation should I use?
Use our U-Value calculator to work out the required thickness of insulation for the application. You can adjust the insulation thickness in the calculation to achieve the required U-Value. We have also created U-Value tables for different floor insulation, wall insulation and roof insulation applications, which can be found on each of the different applications pages. The tables provide the U-Values for a range of insulation thicknesses for each application.
