Celotex General Purpose PIR Insulation Board - TB4000

Name: Celotex General Purpose PIR Insulation Board - TB4000
Brand: Celotex
SKU: np4akhmrne
Availability: InStock

The Celotex TB4000 is a versatile, high-performance polyisocyanurate (PIR) insulation board design...

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Celotex Light/Green Tb4025 General Purpose Pir Insulation Board - 2400 X 1200 X 25Mm

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Travis PerkinsCelotex Grey PIR TB4000 Insulation Board, 25x2400x1200mm

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Product Information

Full details

The Celotex TB4000 is a high-performance polyisocyanurate (PIR) insulation board engineered for contractors and DIYers looking to improve thermal efficiency in walls, roofs, and floors. Its standout feature is its 0.022 W/m.K thermal conductivity, which allows for superior insulation in thinner profiles, making it ideal for space-constrained projects; however, users should note that as a rigid board, it requires precise measuring and cutting to ensure a snug fit and maximum thermal performance.

All features

Model Part Number	TB4000
Brand	Celotex

Extended Product Information

FAQs

Can I use TB4000 in a flat roof?

Yes, it is designed for a variety of building applications including flat roofs, provided the installation follows the manufacturer's guidance and building regulations.

What is the thermal conductivity of this board?

The Celotex TB4000 has a thermal conductivity of 0.022 W/m.K.

Does this board act as a vapor barrier?

The foil facings provide a high level of vapor resistance, but you should always check if your specific application requires an additional dedicated vapor control layer.

How do I cut the PIR boards?

They can be easily cut to size using a standard fine-tooth handsaw or a sharp long-bladed knife.

Are these boards safe to handle?

They are lightweight and manageable, but it is recommended to wear gloves and eye protection when cutting to avoid irritation from dust.

Troubleshooting

Board is too large for the frame gap

Measure the gap again and trim the edges of the board using a sharp fine-tooth saw to ensure a snug, friction-fit without forcing the board.

Foil facing has been torn during installation

Apply high-quality aluminum foil tape over the tear to restore the integrity of the vapor control layer and thermal reflection properties.

Pros and Cons

Pros

Excellent thermal performance in thin profiles
Easy to transport and maneuver due to lightweight construction
Compatible with various building elements like floors, walls, and roofs
BBA certified for quality assurance

Cons

Requires precise cutting for effective thermal bridging prevention
Rigid structure means it cannot be bent around corners
Performance is maximized only when installed correctly with sealed joints

Setup, Compatibility & Care

To install, ensure the substrate is clean, dry, and flat. Measure the area precisely and use a fine-tooth saw or utility knife to cut the board to the required dimensions. When fitting, ensure the edges are tightly abutted to prevent thermal bridging; taping the joints with suitable foil tape is recommended to maintain the integrity of the vapor control layer.

Store the boards in a flat, dry location, ideally under cover, and keep them protected from prolonged moisture exposure and direct sunlight to ensure the foil facing remains intact. The TB4000 is fully compatible with standard construction materials, including timber frames and masonry, but verify specific local building regulations before commencement.