Insulation of the top floor ceiling to unusable, unheated attic spaces is among the most beneficial thermal protection measures. If the roof slope were insulated, the unused attic would also be heated. This costs wasted energy. If the attic has not been finished, the top floor ceiling should be insulated, and not the roof slope.
In the first step, the PAVATEX DB 3.5 vapour control membrane is laid on the floor over the top floor ceiling, bonded airtight and connected. Laying and all connection work must be carried out in accordance with the PAVATEX sealing brochure.
Next, the PAVATHERM insulation boards are laid together tightly. Multiple insulation layers must be carried out with offset joints.