100mm Insulation Board

About

Why 100mm Insulation Boards? 100mm is one of the most widely specified rigid insulation thicknesses in the UK and for good reason. At this depth, a single layer of PIR or phenolic board can often deliver the thermal resistance needed to meet Part L Building Regulations targets across walls, floors and roofs without requiring a secondary layer. That makes 100mm the default specification for many new build and refurbishment projects where performance and build-up depth both matter. Here is what the range covers: Single-layer solution for Part L compliance in many wall, floor and roof applications PIR boards at 100mm achieve 0.022 W/mK thermal conductivity, minimising build-up depth Phenolic boards at 100mm outperform PIR with a lambda as low as 0.019 W/mK for the tightest spaces EPS options available at 0.030 to 0.038 W/mK for cost-effective floor and wall applications XPS at 100mm delivers the high compressive strength and moisture resistance needed for inverted roofs and below-ground use Available as half boards for smaller areas, awkward cuts and last-minute top-ups 100mm PIR Insulation Boards PIR (polyisocyanurate) is the most commonly specified material for 100mm rigid insulation in the UK. Foil-faced, lightweight and easy to cut, PIR boards at this thickness are suitable for solid and suspended floors, framed wall systems, pitched roof applications and flat roof warm deck build-ups. All boards achieve a thermal conductivity of 0.022 W/mK and are non-water absorbent, meaning performance is maintained across damp or humid environments. Celotex GA4100 The Celotex GA4100 is one of the most frequently ordered 100mm PIR insulation boards in the UK. Positioned by Celotex as their general application board, it is suitable for walls, floors and pitched roofs in both domestic and commercial projects. BBA certified, lightweight and simple to install, it is a reliable and cost-effective choice for most standard 100mm specifications. Browse the full Celotex insulation range