Lozenge system on a ventilated system

See chapter 4 for standard and alternative built ups.

Ventilated roof built up with the lozenge system

The construction of the roof is built up as follows, beginning on the inside:
1. Ceiling – any type
2. Damp control course made from metal or plastic film
3. Supporting rafters – generally made from wood
4. Insulation material according to thermal requirements
5. Ventilated cavity: thickness depends on the pitch of the roof
6. Timber boarding, planed no less than 23 mm, not tongue-and-grooved, installed horizontally with gaps between the boards of at least 5 mm
7. Zinc lozenge system