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....
With an appropriate separation layer installed over, such as light-gauge polythene, they are then easily covered by a concrete screed or tongue and groove chipboard, ready to receive the specified floor finish. Thinner polyisocyanurate (PIR) foam insulation boards, such asCelotex TB4000can be cons...