Application ⁄ Roof ⁄ Insulation above rafters

Insulation above rafters

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.

Insulation above rafters

  • For optimum thermal, heat, noise and fire protection. 
  • The complete insulation, sarking and airtight sealing system. 
  • Outstanding sound insulation thanks to fibrous board structure.
  • High efficiency due to planned installation with minimal cutting. 
  • Permeable, but simultaneously airtight and windproof roof construction. 
  • Secure fixing technology with building authority-approved screws. 
  • Fire resistance class REI 45 with only 18 mm thick wood cladding. 

With PAVATHERM-FORTE and ISOLAIR

In areas with higher snow loads, the construction and products used must withstand greater loads. PAVATHERM- FORTE and ISOLAIR are the optimum combination for this.

ISOLAIRPAVATHERM FORTEPAVATEX DSB 2
ISOLAIR
ISOLAIRPAVATHERM FORTEPAVATEX DSB 2
PAVATHERM FORTE
ISOLAIRPAVATHERM FORTEPAVATEX DSB 2
PAVATEX DSB 2

For connections and sealing:

PAVACOLL, PAVAPRIM, PAVABASE, PAVATAPE 20, PAVATAPE 75/150, PAVATAPE FLEX, PAVAFIX 60

With PAVATHERM and PAVATEX ADB

This construction shows the solution for above-rafter insulation protected by the vapour-open roofing underlay membrane PAVATEX ADB.

PAVATEX ADBPAVATHERMPAVATEX DSB 2
PAVATEX ADB
PAVATEX ADBPAVATHERMPAVATEX DSB 2
PAVATHERM
PAVATEX ADBPAVATHERMPAVATEX DSB 2
PAVATEX DSB 2

For connections and sealing: 

PAVACOLL, PAVATAPE 20, PAVAFIX 60, PAVAFIX SN BAND

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.

Laying the PAVATEX DSB 2 roof sheathing roll

Laying the PAVATEX DSB 2 roof sheathing roll

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.

Laying the PAVATEX insulation layer

Laying the PAVATEX insulation layer

Fit PAVATHERM or PAVATHERM-FORTE insulation boards between the sprocket. is bonded with offset joints in the case of multiple insulation layers.

Execution of canopy roof boards (sprocket)

Execution of canopy roof boards (sprocket)

The canopy roof boards are laid on the sprocket flush with the upper edge.

Laying the ISOLAIR boards / Laying PAVATEX ADB

Laying the ISOLAIR boards / Laying PAVATEX ADB

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.

Taping and fixing

Taping and fixing

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.