Insulation fixed to the bottom of the roof structure - nailed: lath/lath mounting

This kind of fastening can be applied with thick as wells as with thin boards and offers the ideal solution in case of ventilation and/or moist production.

First, a bearing lath (e.g. 70 x 40 mm) is fastened to the bottom of the bearers.
The center-to-center distance is determined in function of the live width of the insulating board chosen.

The insulating boards are mounted at the bottom of and parallel with these laths. They are provisionally kept in place with a few nails. When the following board has been mounted, a planed cover fillet (40 x 20 mm) is screwed in the bearing lath located above. The distance between these screws is 50 cm.

Because of the clamping function of the lath/lath connection, an airtight board connection is realised, making the use of a supplementary bearer redundant.

Moreover, in this manner, a ventilation gap is created between bearer and insulation.

LEGEND

1. Corrugated sheets
2. Bearer
3. Bearing lath
4. EUROTHANE
5. Cover fillet