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116mm Celotex TD4000 Flat Roof Insulation 2400x1200

Celotex TD4000 provides a quick and easy method of achieving effective thermal insulation in light traffic, ventilated, lead covered, warm flat roof applications - includes 5.5mm WBP plywood. Thermal conductivity – 0.022W/mK

Price: £ 96.48
(£115.78 inc VAT)

12.5mm Moistureshield Plasterboard - Wallboard Knauf 2400x1200

Knauf Moistureshield is a plasterboard manufactured specifically for use in areas of high humidity. The core formulation with silicone additive ensure the boards resistance to moisture. Thermal Conductivity - 0.24 W/mK.

Price: £ 13.70
(£16.44 inc VAT)

12mm SUPALUX Promat 2440x1220

Promat SUPALUX is a strong, lightweight, non-combustible fire protection building board offering up to 240 minutes fire resistance. SUPALUX is also moisture resistant and can be installed before wet trades are completed and the building is weather-tight.

Price: £ 142.37
(£170.84 inc VAT)

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Knowledge Centre > U-value Calculations

Online U-value calculator

If you need to conduct U-value calculations this Online U-value calculator will help you choose the right thickness of insulation required to meet specified by the Building Regulations U-values and achieve optimum thermal performance for your setting/application.

What is a U-Value and how to calculate it

A U value is a measure of heat loss in a building element such as a wall, floor or roof. It can also be referred to as an ‘overall heat transfer co-efficient’ and measures how well parts of a building transfer heat. This means that the higher the U value the worse the thermal...