Isola Luftespalte (air gap)

Areas of application

Isola Luftespaltesystem (air gap system) is a complete system designed to provide insulated sloping roofs with efficient ventilation and wind-proofing. The system is installed from the inside between the trusses, thus forming a ventilation gap and a continuous wind barrier in the roof construction. Isola Luftespaltesystem can be used on sloping roofs with a pitch of down to 15o and is particularly suitable for renovated roofs.

Isola Luftespaltesystem has been tested by the Norwegian Building Research Institute and its technical properties and conditions for use have thus been confirmed.

Type - measurements - weight

Isola Luftespaltesystem consists of Isola Luftespalte (air gap) and Isola Raftepapp (rafter felt) that have both been punched out from water repellent and porous corrugated felt/sheets of cardboard. Even though these products have one side that is water repellent, the air gap system should not be exposed to rain and snow once it has been installed.

Technical data

Water vapour penetration: 1.32 g/m2hPa
Water-tightness: Water repellent
Venting properties: 0.003 m3/m2hPa

Fitting measurements for Isola Luftspalte

(Adapted to fit 36 mm (1.5”) and 48 mm (2”) rafters, fitted with a centre distance of 600 mm.)
- width: 520-570 mm
- length: 1,100 mm
Isola Raftepapp has been adapted to fit 36 mm (1.5”) and 48 mm (2”) rafters, fitted with a centre distance of 600 mm. Two types of Isola Raftepapp are available:
- Isola Raftepapp for 200 mm insulation (229x283 mm).
- Isola Raftepapp for 200 mm insulation (407x283 mm).