## What is the U-value of 100mm Celotex?

0.2 W/m2k .
Using Celotex to fill the cavities is more expensive, but you will only need to use 100mm celotex to achieve a U-value of 0.2 W/m2k . The only thing to bear in mind here is that you still need to keep a residual cavity on the outside – but this means the cavity can be marginally thinner.

What does U-value mean in insulation?

U-values can tell you how well an insulated glass unit (IGU) will hold in heated or cooled air. The lower the number, the better the insulating performance. U-values generally range from 0.1 (very little heat loss) to 1.0 (high heat loss).

### What is the U-value of 60mm Celotex?

0.022 W/mK.
It keeps the U-value to a minimum and delivers a thermal conductivity as low as 0.022 W/mK. Although a light material, it is surprisingly strong and easy to manipulate….Certifications of 60mm Celotex GA4060 insulation board.

Length 2400mm
Brand Celotex
Material Type Polyiso

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

#### What U values do I need?

To put that into context: a single-glazed window will have a U value of 5.0, a standard double-glazed window around 1.6 and triple glazed around 0.8. Building Regulations require a wall of no worse than 0.3, roof 0.16, and ground floor 0.22. All of these U values are written as W/m2K.

What is the difference between R-value and U-value?

R-Value is a measure of thermal resistance, or the ability of an object or material to resist the flow of heat. U-Value is a thermal transmittance, or the heat loss through a structural element.

## What U value does 50mm Celotex?

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.

### What insulation has the best u-value?

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.