Celotex Insulated Plasterboard - PL4040

The Celotex PL4040 Insulated Plasterboard is a high-performance thermal insulation board bonded wi...

Best current price£65.40from Brick Superstore

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Brick SuperstoreCelotex Pl4040 Insulated Plasterboard 2400 X 1200 X 52.5Mm Pir
£72.00 delivery
£65.40
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Travis PerkinsCelotex PIR Thermal Laminated Insulation Board 2400mm x 1200mm x 40mm (52.5mm Overall)
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£176.09
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Product Information

Full details

The Celotex PL4040 Insulated Plasterboard is designed for professional contractors and DIY enthusiasts looking to improve thermal efficiency in new builds or renovation projects. By bonding high-performance PIR insulation to 12.5mm plasterboard, it allows users to insulate and finish surfaces in a single application, significantly reducing project timelines. However, users should note that the combined thickness requires careful planning when working around existing window reveals or limited-depth framing.

All features

Model Part NumberPL4040
BrandCelotex

Extended Product Information

FAQs

Can I use these boards in a bathroom?

Yes, but ensure you use moisture-resistant finishing techniques and verify that a proper vapor barrier is in place if the wall faces an external cold environment.

What is the total thickness of the PL4040 board?

The board features a 40mm PIR core plus 12.5mm of plasterboard, totaling 52.5mm in thickness.

Is it safe to cut these boards with a power tool?

While possible, hand tools are recommended to minimize dust. Always wear a mask and eye protection when cutting any insulation material.

Can I use standard dot and dab adhesive?

Yes, standard gypsum-based board adhesives are generally compatible, but ensure the substrate is prepped properly.

Does this board provide acoustic insulation?

While the primary function is thermal, the mass of the board does provide some secondary sound reduction, though it is not a dedicated acoustic product.

What is the thermal conductivity (lambda value)?

The PL4040 has a thermal conductivity of 0.022 W/mK.

Troubleshooting

Cracking at the board joints

Ensure the boards are tightly butted together and use premium jointing tape and compound over the tapered edges.

Difficulty in getting a straight cut

Use a straight edge as a guide and a long-bladed insulation knife or fine-tooth handsaw to cut through both the board and the PIR core smoothly.

Board bowing after installation

Verify that your framing centers are consistent and the surface being bonded to is plumb; adjust mechanical fixings if necessary.

Pros and Cons

Pros

  • Reduces installation time by combining insulation and lining
  • High thermal performance in a relatively thin profile
  • Compatible with both direct bonding and mechanical fixing methods
  • Environmentally friendly manufacturing process
  • Tapered edges provide a better finish for jointing compound

Cons

  • Heavier than standard plasterboard due to the PIR core
  • May require more clearance space than non-insulated boards
  • PIR material can be difficult to cut cleanly without the correct tools
  • Not suitable for areas with direct, prolonged high moisture exposure without appropriate vapor barriers

Setup, Compatibility & Care

Installation can be performed through two primary methods: direct bonding (dot and dab) or mechanical fixing to timber studs or metal frames. For mechanical fixing, use suitable-length screws that penetrate the support structure by at least 25mm. When using adhesive, ensure the substrate is clean and dry. For storage, always keep boards in a dry environment, ideally off the ground to prevent moisture absorption. Avoid walking on the boards or placing heavy loads on them before installation, as the plasterboard facing can crack. Use a fine-toothed saw or a sharp insulation knife to cut the boards to size, ensuring a clean edge for tighter fits.

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