In above-rafter insulation, the insulation is laid completely across the rafters and provides the highest quality insulation for your roof. Thanks to the uniformly thick, homogenous insulation layer above the rafters, thermal bridges are avoided and your roof receives seamless thermal, heat and noise protection without weak spots. The positive side effect is that the rafters only have to meet structural requirements.
The structure consists of rafters, which are visible within the building. The rafters can extend to the outside or terminate without overhang, flush with the external wall. Either timber sheathing or timber-based sheets are laid directly over the rafters as a substrate for the installation. The bottom version enables both formation of a canopy using sprocket and all-round insulation of the building shell.
Lay the PAVATEX DSB 2 roof membrane directly on the roof boards and then install the sprocket, using a guide for the insulation if necessary.
Fit PAVATHERM or PAVATHERM-FORTE insulation boards between the sprocket. is bonded with offset joints in the case of multiple insulation layers.
The canopy roof boards are laid on the sprocket flush with the upper edge.
Beginning at the eaves, the ISOLAIR is laid in bond as the top layer. Fixing of the boards to the sprocket is carried out with staples or roofing nails to prevent sliding.
Beginning at the eaves, the over-rafter insulation is covered with the PAVATEX ADB membrane.
Following completion of all necessary connection and sealing work (see PAVATEX sealing brochure for execution), the frost- and uplift-resistant fixing of the counter battens, including the PAVATEX insulation and insulation protection membranes is carried out.