The 100mm Polystyrene Sheet (1220mm x 2440mm) is a maximum-capacity expanded polystyrene (EPS) insulation panel engineered to deliver top-tier thermal insulation performance and high compressive strength. Featuring a substantial 100mm core thickness, it provides exceptional thermal resistance, making it an ideal choice for high-efficiency new builds, low-energy building designs, and extensive thermal retrofits.
 
Manufactured from high-density rigid EPS, this board resists moisture absorption, rot, and compression, maintaining its dimensional stability and insulating properties over the lifetime of the structure. Despite its heavy profile, the panel remains remarkably lightweight and easy to handle, cutting cleanly with a hand saw or hot wire cutter to ensure precise, friction-fit installations without cold bridging.
 
Supplied in a standard 8ft x 4ft sheet size (2440mm x 1220mm), it provides rapid surface coverage for heavy-duty ground-floor insulation beneath concrete slabs or floating screeds, deep joist floor systems, modular timber frame wall infills, and flat roof applications. It is chemically inert and designed for use in internal and structural building assemblies when protected by an appropriate fire-rated substrate, such as gypsum plasterboard.
 
Key Benefits
BBA accredited, certificate 87/1796.
Provides cost effective insulation for the lifetime of the building
Excellent compression properties
100% recyclable
Achieves an A+ rating in the BRE Green Guide to Specification
Available with Class E fire retardant additive
Flood proof
Lightweight and easy to handle
Is non-toxic and biologically inert