Rigid, lightweight, polyisocyanurate (PIR)foam insulation boards (such asCelotex GA4000andXR4000) are among the most thermally efficient, commonly-available insulation products on the market. Fixed over the rafters of a pitched roof, they can help to achieve the required U-value in just a singl...
The building detail is for illustrative purposes only. It does not constitute advice and should not be relied upon. Insulation products Product NameThickness RangeSizesLambda Celotex GA400050-100mmWidth 1200mm, Length 2400mm0.022 Celotex XR4000110-200mmWidth 1200mm, Length 2400mm0.022...
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 perimeter upstand insulation....
Installing thermal insulation below a concrete deck is not usually an option, so rigid insulation is installed above the deck. Lightweight, rigidpolyisocyanurate (PIR) foam insulation boards(such asCelotex GA4000andXR4000), are among the most thermally efficient, commonly available insulation materials...