The elements of the crate are laid on top of rafters made of timber or board. The distance between the individual bars of the crate is selected at least 30 cm, but here it all depends on the material of the roof.
Lathing device
For example, for a bituminous tile it is continuous everywhere. After that, a film is lined along the rafters, which should be between the valley metal and the crate. Due to this, a “tooth” will appear and it will need to be raised by an amount equal to the thickness of the crate board. The crate for the valley is set one at the level with the rafters. This is achieved thanks to the control rail.
After that, the waterproofing material is laid. His task is to protect wood moisture. When the work is finished, the installation of the crate begins, which should be perpendicular to the rafter structure. The distance between the crate of the metal tile and the crate for the valley is better to choose about 70 mm.
One of the problems that arises in the process of work is the need to create ventilation that removes moisture from the valley of the valley. The moisture protective film is mounted on a solid base, as this ensures that the web material does not sag. It is better to fix the insulation not in the center, but closer to the edge.
Installation of metal. Main stages
Now you can proceed directly to the installation of metal. Below we describe the main stages of this process:
- Bring the metal sheet to the valley. It is necessary to cut the metal so that the cutting line was 200 mm higher than the exit to the ramp.
- Fix the sheets on the top of the valley. They are joined to be fixed either with self-tapping screws or with a sealant. Note that the more reliable the mount, the better the under-roof space will be protected, because moisture can seep in this place.
- Around the valley, the cut-off elements of the metal tile are attached last. The first sheet is stacked so that its lower part is below the level where the valley end of the ramp. Overlap of elements is required to choose more than 130 mm. The sheet itself must be between two others - the top and bottom. To perform the fastening of sheets of tiles, experts advise using special screws.
Obviously, the process itself is not much different from the installation of metal. If you are unclear at any point, we recommend that you study the article on this topic on our website.
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