52.5mm Celotex Insulated Plasterboard PL4040 (1200mm x 2400mm)

3 customer reviews

£44.72 ex VAT

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Get the best prices on insulated plasterboards here! Celotex 52.5mm is a quality product made up of a polyisocyanurate (PIR) core with a foil lining on one side and paper lining on the other. The foil lined side of the sheet is bonded to 12.5mm plasterboard. The plasterboard is made up of a Gyproc core with quality paper linings.


  • Celotex as a brand is renowned for its quality products and reliable services
  • Their high-quality products manufactured are virtually impossible to beat in price!
  • Celotex insulation has better thermal efficiency than many other materials
  • The Celotex brand offers materials to suit a wide range of applications including, pitched roofs, flat roofs, walls, floors, and ceilings.
  • Other Celotex product include Thermaclass, cavity wall boards, and insulation boards

52.5mm Insulated Plasterboard

  • 52.5mm – Product code PL4040
  • 52.5mm Insulated Plasterboard is a popular product in the construction industry and a standard size board suited to fit most projects
  • This is a 2-in-1 product means you can improve thermal quality of the building and apply a wall finishing in one application
  • Insulated plasterboards are lightweight making them super easy to handle, cut, and install, this versatile product can be installed within domestic or commercial buildings
  • This product is a 12.5mm plasterboard and 40mm insulation board. This standard board is a safe choice when insulating you home and one of thinner made insulated plasterboard products, making the most of your space
  • The 52.5mm is cost effective and practical
  • This board offers an incredible thermal conductivity of just 0.022W/mK – which for those who don’t know, means very small amount of heat can pass through the board, keeping the heat inside your home or office!
  • Whilst staying warm in the winter and cool in the summer, you’re also providing an energy efficient environment that contributes to the reduction of climate change
  • While you think it stops at helping the environment, with less heat escaping, Celotex insulated plasterboards can also save you money on your energy bills
  • These boards can be applied to walls and pitched roof applications in either a dot and dab or mechanical fixing application
  • The insulated plasterboards are also available in sizes 37.5mm, 62.5mm, 72.5mm, 77.5mm to suit every application need
  • All Insulated plasterboards are CFC, HCFC and Formaldehyde Free with zero ozone depletion potential (ODP) and low global warming potential (GWP)
  • Don’t be surprised if you see Insulated Plasterboard referred to as the following, Thermal laminate, Thermaline Boards, Insulation backed plasterboard, Thermal PIR Board.


  • Reaction to Fire: Euroclass B-s1
  • BS EN 13501-1
  • CE Marked (18.DOPPL4000-01) to BS EN 13950
  • BBA Approved (Cert no 16/5357)
  • Achieves a BRE Green Guide A+ rating
  • Quality Management Standard – ISO 9001:2015

More Information:

  • Product code: PL4040
  • Thickness: 12.5mm + 40mm (52.5mm)
  • Size: 2400mm x 1200mm
  • Materials: Gypsum, PIR, Foil, Paper
  • Thermal Conductivity: 0.022W/mK
  • R-Value: 1.85 m2.kW
  • Piece per pallet: 29

How are insulation boards installed in wall applications?

Insulated plasterboard can be installed using the dot and dab method however the most used method of installing insulated plasterboards is to mechanically fix the boards onto timber battens. See below.

Step 1:

Fix the timber battens at the floor and ceiling around the entire room. Then go on to fix the battens around door and window openings and vertically around the room at 600mm apart. Fix the battens 75mm from its end. Every batten should have a minimum depth of 25mm and width of 47mm. Back the battens with a damp proof course (DPC).

Step 2:

Cut the insulation boards to the required size. The boards should be cut 5mm short of floor to ceiling height.

Step 3:

Fit the insulated plasterboard, at sheet joins, lap them over the timber battens so the two sheets meet at the centre point of the batten. Tightly but the boards with fixings no less than 10mm from the edges of the board. Fix drywall screws at 300mm centres. Or large headed galvanised clout nails at 150mm centres. Make sure the fixings do not go all the way through the timber. A penetration through the board and 22.5mm into the timber frame should be enough.

Step 4:

Seal the perimeter of the insulated plasterboard with flexible sealant or the equivalent product. Go on to complete the wall using plaster and adhesive compound. Add paint and keep the walls plain or add a bolder touch to suit your taste with wallpaper.

Does Insulated Plasterboard cause dampness?

When Insulated Plasterboard is installed correctly and care is taken to ensure all gaps between and behind the insulation boards are filled, this will prevent dampness from occurring. When gaps are filled to high standards this prevents moisture from migrating from the warm air in the room to the colder solid wall behind the insulation. If the Insulated Plasterboards are not correctly installed and gaps occur, this will present a condensation risk. When boards are installed, care should be taken to ensure the relevant wall is free of mould and rot and if they should occur they are treated before installing the boards. Installing insulation materials over mould or rot can cause the problem to worsen and in extreme cases, damage to the structure of the building.

What size do I need?

The size you need will depend on the space being insulated. Thicker insulation is always the best option to achieve the best thermal conductivity possible however a thinned board will also improve the thermal conductivity. This decision is really based on how much space you want to save, and if the board meets the building regulations.


Additional information

Dimensions2400 × 1200 mm




Material Type

Polyisocyanurate (PIR)

Pieces Per Pack


Sales Unit


Unit Coverage


Manufacturers Reference


Thermal Conductivity




Fire Rating

Euroclass B

Edge Type



Paper Facing

Weight (kg/m2)


3 reviews for 52.5mm Celotex Insulated Plasterboard PL4040 (1200mm x 2400mm)

  1. Joshua Weeks

    Celotex 52.5mm is always my go to products when using Insulated Plasterboard. Always get a professional and speedy service with Trade.

  2. Rasheed

    Used 52.5mm in my extension. Really easy to use and saved me money on materials.

  3. Francesca Trudy

    Really quick delivery, very pleased.

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