Thinner polyisocyanurate (PIR) foam insulation boards, such asCelotex TB4000can be considered for the perimeter upstand insulation. Key Considerations When using Celotex products, you need to satisfy yourself that use of the product meets all relevant national Building Regulations and guidance as well ...
Arigid polyisocyanurate (PIR) board can be installed between the joists(Celotex GA4000andXR4000can be considered) provided the insulation is cut accurately and fitted carefully to avoid air gaps. Thinner polyisocyanurate (PIR) foam insulation boards, such asCelotex TB4000, can be considered for the...