PIR Insulated Plasterboard - 112.5mm
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B&Q - 112.5mm Pir Insulated Plasterboard 2400mm X 1200mm
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£211.92
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HomebasePIR Insulated Plasterboard 112.5 x 1200 x 2400mm
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Product Information
Full details
The B&Q 112.5mm PIR Insulated Plasterboard is designed for professional contractors and DIYers looking to improve thermal efficiency in new builds or home extensions. By combining a 100mm rigid PIR core with a 12.5mm tapered-edge plasterboard, this product significantly reduces heat loss and acts as a moisture-managing vapour barrier in a single installation step, though its substantial thickness requires careful planning for room dimensions and door reveals.
All features
| Model Part Number | 112.5mm |
|---|---|
| Brand | B&Q |
Extended Product Information
FAQs
Can I use this board in a bathroom?
Yes, the integrated vapour barrier makes it suitable for many internal applications, but you must ensure all joints are sealed correctly and the room is well-ventilated.
What is the best way to cut the boards?
A fine-toothed hand saw is recommended for smaller cuts, while a circular saw with a vacuum attachment is best for long, straight cuts.
Does this board need a separate vapour barrier?
No, the foil-facing on the PIR core acts as an effective vapour barrier when joints are correctly taped.
Can I apply plaster directly to the board?
Yes, the board features a standard tapered-edge plasterboard surface which is designed to be skimmed or painted once the joints are filled.
How much space will I lose from my room?
You will lose approximately 112.5mm from the internal dimensions of the wall where the boards are applied.
Troubleshooting
Board cracking at joints
Ensure fixings are spaced correctly and that joints are reinforced with high-quality scrim tape before plastering.
Difficulty achieving a flat finish
Check that the substrate is level; use shims or adjustable adhesive dabs to bring the board into the correct plane.
Visible gaps between boards
Trim boards precisely to fit; use an expanding foam sealant compatible with PIR to fill any minor perimeter gaps for thermal integrity.
Pros and Cons
Pros
- High thermal insulation performance
- Acts as an integrated vapour barrier
- Saves time with single-pass installation
- Provides a flat, ready-to-paint surface
- Suitable for both walls and ceilings
Cons
- Increased wall thickness may impact room space
- Requires professional cutting tools for precise edges
- Heavy to handle due to board density
- Cannot be used on damp walls without prior treatment
Setup, Compatibility & Care
To install, ensure the substrate is dry, level, and free of debris. Use appropriate mechanical fixings or high-quality adhesive dabs suitable for PIR materials. When cutting the boards, use a fine-toothed hand saw or a circular saw with a dust extraction system to achieve a clean edge. Always ensure joints are taped and skimmed to achieve a seamless finish. The board should be stored in a cool, dry area on a flat surface to prevent warping or core damage. Avoid exposing the board to prolonged moisture or extreme temperatures prior to installation to ensure the bond between the plasterboard and insulation remains intact.