environment | February 27, 2026

What size are insulation boards?

What size are insulation boards?

Three types of PIR Insulation Boards available in different thicknesses, 12mm-45mm, 50mm-100mm and 110-150mm, all especially designed to eliminate thermal bridges, very easy to cut and shape and energy-efficient.

Is 50mm insulation enough?

With 50mm of insulation you should expect to see a reduction in your heating bills by around 30%, but with 100mm that percentage will shoot to over 50%. Your heating system won’t have to work as hard, and as a result won’t use as much gas – so more cash in your pocket!

How thick should insulation board be?

Rigid board insulation generally comes in standard thicknesses ranging from ½ inch to 2 inches. It is possible for homes located in extreme climates to order specialty thicknesses of up to 6 inches directly from certain manufacturers. Obviously, the thicker the rigid board, the higher the insulation capacities.

Which board is best for insulation?

Polyurethane (PUR) is one of the most efficient insulation materials on the market. PUR is available in the shape of insulation boards or foam. However, the boards have a better insulation value than the foam variant. Moreover, these boards guarantee a certain thickness in advance and nothing has to be taped over.

What is the U value of 50mm Celotex?

Technical Spec

Product CodeBoard dimensions (width) x (length) = (m²)U-value (W/m²K)
Celotex CW404012×0.45×1.2 = 6.48m²0.56
Celotex CW404511×0.45×1.2 = 5.94m²0.50
Celotex CW405010×0.45×1.2 = 5.4m²0.44
Celotex CW40608×0.45×1.2 = 4.32m²0.37

Is Recticel as good as Celotex?

All of the Above hold the same thermal conductivity on 100mm Insulation Board of 0.022W/mK. Contrary to popular belief all of these brands work towards the industry standard of 0.022W/km. So, no matter the PIR insulation brand either Celotex, Recticel, or Kingspan they all do the same job.

What thickness of Celotex do I need?

Take into consideration the thickness you want to insulate to and if there is any pre-existing insulation in place, we recommend using 300mm if using wool insulation and 150mm if using the rigid insulating boards like Celotex or Kingspan.

What is the R-value of 1 inch foam board?

R-values can range from 3.6 to 4.2 per inch.

What is the U-value of 50mm Celotex?

Which insulation has the highest R-value per inch?

Vacuum insulated panels
Vacuum insulated panels have the highest R-value, approximately R-45 (in U.S. units) per inch; aerogel has the next highest R-value (about R-10 to R-30 per inch), followed by polyurethane (PUR) and phenolic foam insulations with R-7 per inch.

Do you need an air gap for insulation?

Solid walls, however, must be faced with an insulation product, so they can often eat into floor space depending on the thickness of the insulation as an air gap is needed to prevent condensation and moisture build-up. Insulation with a moisture barrier means you don’t need to leave an air gap during installation.

What is the R value of 75mm Celotex?

Thickness: 75mm. rValue: 3.40m2K/W. Weight: 2.34kg/m2.