What is the R value of Celotex?
Celotex GA4000 specifications
| GA4000 boards | GA4050 | GA4080 |
|---|---|---|
| R-value (m²K/W) | 2.25 | 3.6 |
| Thickness (mm) | 50 | 80 |
| Width (mm) | 1200 | 1200 |
| Length (mm) | 2400 | 2400 |
What is the thermal conductivity of Celotex?
0.022 W/m.K
Celotex GA4000 has a declared thermal conductivity of 0.022 W/m.K, according to BS EN 13165 for factory made rigid polyurethane foam (PU) products. All Celotex products are manufactured under Environmental Management System – ISO 14001:2015.
How do you convert R-value to U-value?
To calculate U-value, divide 1 by the R-value—a 3.45 R-value equals a U-value of 0.29.
What U value does 50mm Celotex?
Technical Spec
| Product Code | Board dimensions (width) x (length) = (m²) | U-value (W/m²K) |
|---|---|---|
| Celotex CW4040 | 12×0.45×1.2 = 6.48m² | 0.56 |
| Celotex CW4045 | 11×0.45×1.2 = 5.94m² | 0.50 |
| Celotex CW4050 | 10×0.45×1.2 = 5.4m² | 0.44 |
| Celotex CW4060 | 8×0.45×1.2 = 4.32m² | 0.37 |
Is Celotex a good insulator?
The benefits of using Celotex insulation are as follows: Better thermal efficiency per mm than many other insulation materials. A lower environmental impact that other typical PIR manufacturers. An expansive product range suitable for pitched and flat roofs, walls and floors.
What are the units of U-value?
A U-value value shows, in units of W/m²·K, the ability of an element to transmit heat from a warm space to a cold space in a building, and vice versa. The lower the U-value, the better insulated the building element.
Is R-value the same as U-value?
Both U-value and R-value measure energy efficiency. Here are the differences in a nutshell: U-value (also known as U-factor) is a measure of heat transfer (heat gain or loss through glass), while R-value is a measure of heat resistance.
What insulation has the best U value?
Obviously, the insulation material will improve the U value. The best currently available is the Val-U-Therm system (available from Scotframe) with a U value of 0.09W/m2K from a wall thickness of 235mm, plus the outer skin.
Does Celotex need a Vapour barrier?
You must use a vapour barrier otherwise warm air, which contains more water than cold, may get through to the cold outer fabric. If it does, and cools, you’ll get condensation.
What is the U-value of 100mm Fibreglass?
2.2 m2K/W
A construction element with a high thermal resistance (e.g. rock wool), is a good insulator; one with a low thermal resistance (e.g. concrete) is a bad insulator. 100mm of glass fibre insulation batt would have has an R value of 2.2 m2K/W – which makes the wood fibre more resistant to heat loss.
Is Celotex better than rockwool?
90mm Celotex or equivalent will give the best insulation, it’s insulation factor is about twice that of Rockwool. But it needs cutting which takes time and is messy. Rockwool might be easier to install, although you have to keep it in place somehow and if installed vertically ain’t so simple. Its also cheaper.