Insulation Boards
(102 Products)Insulation boards provide rigid, high-performance thermal resistance across a building's envelope. Suitable for various structural applications, these engineered panels improve energy efficiency by reducing heat loss through walls, floors, and roofs. Selecting the correct board ensures compatibility with specific masonry, timber frame, or roofing systems.
Understanding Insulation Boards
Rigid insulation panels, encompassing Polyisocyanurate (PIR), phenolic foam, and Expanded/Extruded Polystyrene (EPS/XPS), deliver continuous thermal resistance without slumping or degrading. By drastically reducing heat transfer through the structural envelope, these boards provide a dimensionally stable solution for achieving strict energy efficiency targets across residential and commercial builds.
Always verify the exact board type, dimensions, and declared thermal properties against your specified structural build-up. Boards are not interchangeable simply because they share a similar thickness or foil facing; you must adhere to the manufacturer’s specific installation guidance for your chosen structural application.
Where the specified build-up uses a board facing as part of an air or vapour-control layer, use the manufacturer’s compatible tape, sealants, and details for joints, edges, and penetrations. A foil face or taped board joint alone does not establish a complete vapour-control design.
Material Range
- PIR Insulation Boards: Polyisocyanurate foam panels providing excellent thermal performance per thickness, featuring solutions such as the Celotex GA4000 series and Unilin Thin-R.
- Phenolic Insulation Boards: Premium rigid boards offering the lowest thermal conductivity for applications where space is highly restricted, featuring solutions such as Kingspan Kooltherm.
- EPS and XPS Insulation Boards: Expanded and extruded polystyrene sheets offering cost-effective and high-compressive-strength thermal layers, featuring solutions such as standard EPS70 panels.
Performance Benefits
- Thermal Resistance: Provides a continuous layer of insulation to reduce heat loss and improve overall building energy efficiency.
- Dimensional Stability: Rigid construction prevents sagging, slumping, or shrinking within cavities and frameworks over the lifetime of the building.
- Lightweight Handling: Easy to cut, position, and install on-site using standard hand tools without adding significant structural weight to the assembly.
Typical Applications
- Pitched and Flat Roofs: Installed above, between, or below rafters and flat roof joists to create thermally efficient warm or cold roof constructions.
- Wall Cavities and Linings: Used within masonry cavity walls, timber frames, and solid wall linings to meet required structural U-values.
- Floor Systems: Positioned above or below ground-bearing concrete slabs and suspended timber floors to prevent downward heat loss into the ground.
Specification & Standards
- BS EN 13165: Thermal insulation products for buildings. Factory made rigid polyurethane foam (PU) products. Specification.
- BS EN 13163: Thermal insulation products for buildings. Factory made expanded polystyrene (EPS) products. Specification.
- BS EN 13166: Thermal insulation products for buildings. Factory made phenolic foam (PF) products. Specification.
Related Materials and Construction Uses
Insulation boards form a key part of the wider building envelope and must be correctly integrated with supporting components. Depending on the specified system, boards are installed alongside breather membranes, damp-proof courses, and specialised mechanical fixings or adhesives.
When calculating total wall, floor, or roof performance, the board thickness and declared thermal conductivity must be assessed alongside the surrounding masonry, timber, or external cladding materials to ensure the complete assembly meets the required Building Regulations.
Frequently Asked Insulation Boards Questions
What are the disadvantages of insulation boards?
Rigid boards are not flexible, meaning they cannot easily wrap around complex shapes, pipes, or curved structural elements. They require precise cutting to prevent air gaps, and certain materials may offer lower compressive strength or require thicker profiles to achieve the same thermal performance as premium options.
Where can I find cheap insulation boards?
EPS (Expanded Polystyrene) boards are generally the most cost-effective option within our rigid insulation range, providing excellent thermal value per pound. However, the cheapest board may not always meet the required U-value for your available cavity width, so you should balance material cost against the thermal performance required for your specific build.
Does insulation board stop damp?
Insulation does not resolve an existing damp source. Establish and remedy the cause before covering the wall. The wall construction and moisture assessment determine whether a vapour-control layer is needed and where it belongs; do not add one behind the boards as a universal precaution.
What is insulation board?
An insulation board is a rigid sheet of high-performance thermal material—such as PIR, EPS, or phenolic foam—used to reduce heat loss through a building’s roof, walls, and floors. They offer a stable, continuous layer of thermal resistance that helps properties meet modern energy efficiency standards.
Are insulation boards flammable?
Rigid insulation boards carry specific Euroclass fire ratings depending on their chemical composition and facing materials. While many boards incorporate fire retardants, materials like standard EPS or PIR remain combustible. Always select the board specified by your architect to ensure it meets the strict fire safety requirements of your structural assembly.
Are insulation boards soundproof?
While rigid thermal boards provide a basic level of acoustic mass, they are primarily designed for heat retention rather than soundproofing. If your primary goal is to block noise transmission, you should look towards dense mineral wool acoustic slabs or specialised acoustic plasterboards engineered specifically to absorb sound waves.
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