The roof space, which consists of a conventional framework, is ventilated, unfinished and unheated. Installation will simply consist of unrolling the insulation on the floor or between joists and completing the insulation with a second layer staggered perpendicularly if necessary.
The insulation thickness will depend on the required thermal efficiency.
If necessary (recommended for optimum insulation)
The insulation must not block ventilation openings and must not touch hot sources (chimney flues, lights, etc.), with a minimum fire separation of 20 cm. In these cases, use a non-combustible insulation (M0).
Store rolls and batts in their original packaging, protected from rain and direct sunlight.
Cut the insulation to the required width between supports, with an excess of 2 cm, and place the insulation under gentle compression ("spring effect") to ensure perfect contact with the uprights.
To ensure continuous insulation, take special care when sealing the joints between walls (wall / floor / slope) and checking that the strips are in perfect contact.
Ensure the maximum seal of the insulation by installing an offset, continuous vapour barrier on the inside (hot) and a roof-boarding screen that is pervious to water vapour on the outside (cold).
Install a finishing facing with maximal fire rating (mandatory).