37.5mm Celotex Insulated Plasterboard PL4020 (1200mm x 2400mm)

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Bonded Plasterboard

Get the best prices on insulated bonded plasterboards here! Celotex 37.5mm is a quality product made up of a polyisocyanurate (PIR) core with a foil lining on one side and a 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, which is bonded to the PIR core.

Celotex, known for its brand, is esteemed for the excellence of its products Their top-notch products are nearly unbeatable in terms of price competitiveness on our website. Celotex insulation boasts great thermal efficiency. This 2-in-1 product consists of plasterboard bonded to a PIR board to create a plasterboard with thermal qualities. The 37.5mm bonded plasterboard is a popular Celotex product.

37.5mm Insulated Plasterboard

  • 37.5mm – Product code PL4025
  • 25mm (12.5mm Plasterboard Bonded) Insulated Plasterboards are one of the best-selling products in construction market
  • The bonded Plasterboard has a tapered edge for an easier and more durable completion
  • 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 25mm insulation board. This thin board is a great way to make the most of your space
  • This size is the most popular due to its practical size, this 37.5mm is also cost effective
  • 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
  • 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 or even bonded plasterboard.


  • 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

These bonded plasterboards can cut down install times due to them being a 2 in 1 product. Doing the job of insulation and plasterboard in one single bonded board.

Why pick 37.5mm Celotex Insulated Plasterboard?

37.5mm Celotex Insulated Plasterboard is a versatile option for construction and renovation projects, offering numerous advantages. One of its primary benefits is thermal insulation. It significantly improves a building’s energy efficiency by reducing heat transfer, resulting in lower heating and cooling costs. This feature is particularly valuable for maintaining a comfortable indoor environment and decreasing energy consumption.

Another key benefit is that the product is a 2-in-1 product, which combines insulation and plasterboard. This can cut down installation time in half compared to installing insulation and plasterboard separately.

From an aesthetic perspective, 37.5mm Celotex Insulated Plasterboard offers a smooth and uniform finish that can be easily painted or decorated to match interior design preferences. This creates a polished and visually appealing surface that contributes to the overall aesthetics of a space.

Moreover, using Celotex insulated plasterboard can assist in meeting energy code requirements and improving a building’s energy efficiency rating. This is crucial for new constructions or renovations aiming for certification or compliance with energy efficiency standards.

How are bonded plasterboards 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.

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).

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

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.

Seal the perimeter of the insulated plasterboard with a 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.

Is it cheaper to buy insulated plasterboard?

Yes, buying insulated plasterboard is a cheaper alternative to buying insulation boards and plasterboards separately. It also makes an easier process and quicker installation by handing, cutting, and fitting one product instead of two, this means less waste.

How do you cut 37.5mm insulated plasterboard?

The best and easiest way to cut insulated plasterboard is to measure and mark the board to size and then scored the insulation side, cutting through to the paper back of the plasterboard with a sharp knife, snap the board over a hard edge and score the other side. A fine-toothed saw can also be used to cut the boards.

What size of thermal plasterboard 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)



2-3 Working Days

9 reviews for 37.5mm Celotex Insulated Plasterboard PL4020 (1200mm x 2400mm)

  1. Michael

    Already planning to order more of this insulation

  2. Henry


  3. John Cristy

    Used 37.5mm Celotex Insulated Plasterboard for the first time the other day, 2 in 1 board saved a lot of time. I thought it was easier and cheaper to buy 25mm Celotex then get a normal 12.5mm Plasterboard but by the time I done the labour and my time it wasn’t cost effective. Was happy with the service and delivery drive Hamid was helpful.

  4. Karman Prescot

    Excellent Service

  5. Daniel Hallis

    Really quick turn around and smooth delivery.

  6. KOMAL

    Cant beat these prices at the minute, defo will be ordering the next lot from here.

  7. Dave Spokes

    Brilliant product, really easy to work with.

  8. Samantha Jones

    Purchased 37.5mm Celotex Insulated Plasterboard from Trade Insulations for our self-build project, me and my husband was very happy with this product saved us so much time and money.

  9. David Burrows

    Ordered 30 sheets of Celotex Insulated Plasterboard 37.5mm – great product and very easy to use, highly recommend this

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