Celotex comes in a range of thicknesses from 20mm to 200mm. These are the same boards made from PIR and foil backed. Celotex have put them into ranges to help you decide what thickness may be more suitable for your application, however you may have been given a specific U value you need to meet or been advised. If you are unsure, please contact our technical team sales@insulationuk.co.uk

TB4000

TB stands for thermal bridging, which is areas prone to cold spots & heat loss. Thickness ranges from 20mm to 40mm, ideal for tight spaces or for a multi layer build up.

GA4000

Is for general applications - ranging from 50mm to 100mm in thickness, these boards are more commonly used in walls, but are suitable for floors and pitched roofs. GA4100 100mm PIR insulation is perhaps the best selling thickness in this range.

XR4000

Stands for extra resistance, ranging from 110mm to 150mm this insulation is idea for when space isn't a restriction and where a superior thermal efficiency is required.

The 4000 is the range name given to Celotex PIR - so to differentiate between the thicknesses the coding starts with 4 to tell you the Celotex range then the thickness of the insulation is the preceding number.

4020 - 4000 range 20mm thickness

4075 - 4000 range 75mm thickness

4150 - 4000 range 150mm thickness

An R value is the thermal resistance that the insulation has. PIR insulation has a high thermal resistance ensuring reduction in heat transfer

Solid walls are normally made of brick or masonry where there is not fittings to the wall. The PIR is normally fixed with an adhesive, mechanical fixings can be used as a further way of securing the boards. Make sure the wall is clear of debris, like old plaster, wall paper etc before affixing the PIR boards.

A timber frame wall is normally wooden battens fixed to a solid wall to ensure stability.The PIR can be cut and fitted tightly between the battens. The insulation can be fixed over the timber joists, using a mechanical fix.

The thickness of your insulation board will be dependent on a few factors. Is your insulation for walls, floors or a pitched roof, how much space is there and what u value do you need to achieve. If you haven't been advised by your builder or building control, then we can help. Just call the team on 03003 034 578 or email us at sales@insulationuk.co.uk

U-values are determined for various building elements, including walls, floors, roofs, windows, and door and calculating U values can be daunting. There are several factors to include, especially where the insulation will be installed. There are calculators available, but our technical team can help call us on 03003 034 578.

The standard PIR boards can be used for cavity wall insulation, but you will need to cut them to size, ensure you have cavity batts to ensure a 50mm air gap. We recommend using either Eurowall+ full fill cavity boards or Eurowall partial fill cavity insulation board

No, if you are using PIR as a wall insulation, we recommend using plasterboard

and a plaster like British Gypsum Thistle Multi Finish Plaster 25kg

once the wall is plastered then you can decorate.

If you need to cut your PIR to fit a particular size, then be aware it can be a messy job. Make sure any floor is covered you can use floor protection

When using PIR insulation as a floor insulation, you will need a DPM, you can shop DPM rolls here

Yes, the PIR board normally has the manufacturers name written on it.

Yes the PIR board has grid lines to enable you to cut it correctly.

Yes PIR insulation boards are foil faced on both sides

PIR has a low thermal conductivity (0.022 W/mK) to optimize energy savings.

PIR stands for polyisocyanurate and is a rigid foam board insulation. It is a closed cell foam structure