Thermaclass Cavity Wall 21 is an easy to install, high thermal performance polyisocyanurate (PIR) insulation board for full fill cavity wall applications, with a thermal conductivity of 0.021 W/m.K. It can be installed with up to a 10mm residual cavity (to support ease of installation and accommodate mortar squeeze) or as a full fill solution with no residual cavity.
The boards have a low emissivity foil facing to each side and feature an engineered tongue and groove joint profile, helping to ensure a continuous layer of insulation to maximise thermal performance and provide protection from wind driven rain.
External Walls – Full Fill Masonry Cavity Wall
Lightweight 1190x450mm boards (installed dimensions)
Tongue and groove edge profile
Low emissivity foil facing
BBA approved – certificate 16/5343
Board / Roll size: 1190x450mm (installed) 1205 x 465mm (including tongue)
Thickness : 90-140mm
Lambda: 0.021 W/m.K
Reaction to Fire: Euroclass E Reaction to Fire classification, according to EN 13501-1 (Products with this level of classification are not provided with a rating for smoke emission)
Excellent thermal performance with a thermal conductivity of 0.021 W/m.K, reducing the thickness of insulation required to hit the target U-value.
Low emissivity foil facing provides improved thermal performance in sealed cavity air spaces, improving the achievable U-value.
Easy to install – The boards are sized to fit standard cavity wall tie spacing. They are light and rigid, assisting with ease of transportation, handling and fitting.