Slate roof
Over the past decade, the supply of roofing products on the construction materials market has increased significantly. Slate has long been used for roofing, and its choice as a coating often occurs in the present. It is necessary to determine the volume of purchase of material, correctly calculating the area of overlap. Between the smooth and wave type sheets often, and not without reason, the second option is chosen.
Arrangement of crates
The work on the arrangement of the slate under the slate is easy to perform, if you approach its implementation with responsibility. It is necessary to observe strict sequence of work performed:
- Beams are mounted first and rafters are fixed. Rafters are installed at a distance of 1 to 2 m between them (depending on the length of the ridge beam). The rafter design consists of 2 bars fixed by a crossbar under an inclination.
- The crate is nailed from the bottom of the structure. The bar is applied to the rafters below and grabs with a pair of nails. The mounting pitch should correspond to the size of the sheet so that it can be fixed at the edges and in the middle part of the batten. If the roofing sheet is standard and has a size of 1.20x0.68 m, the distance between the sheathing elements should be approximately 0.5 m. Fastening to the rafters is carried out with nails with a galvanized surface of up to 8 cm. At this stage, a rain trough is installed.
- The arrangement of hydro and thermal insulation. The role of waterproofing will perform a layer of roofing material. To move around the wooden structure was convenient, the roofing felt should be laid in the vertical direction. After crossing the ridge of the roof, the roll is not released, but gradually unfolds as it is fixed. Waterproofing strips should be fixed with a construction stapler, while the overlap should be equal to 10 cm. The waterproofing film and mineral (basalt) wool are fixed in the same way. To keep the insulation firmly held, hard cardboard is used on the inside of the crate.
- In place of the exit of the chimney on the roof laying slate has its own specifics. If its location is a ridge, then an opening for the pipe is left and an apron made of galvanized steel (galvanized steel) is arranged below. Sheets are laid on the apron, and the joint with the final structure is sealed with asbestos. If the chimney comes out on the roof slope, then the junction from galvanization is done under waterproofing and roofing material. From above, instead of an apron, the joint between the coating and the pipe can be sealed with a cement-based solution.
Crate boards should be free of bark, since bark beetles and larvae can multiply beneath it, gradually destroying the structure. For this reason, wood is treated with special impregnations with bio-and flame-retardant properties.
Note! If the break between laying the ruberoid and mounting the slate is long enough, it is better to fix the waterproofing to the sheathing strips with a large number of staples, which would prevent the possibility of material damage by gusts of wind.
Installation on the batten
The slate roof is mounted in a vertical direction from the bottom up, observing overlap with the upper row of the lower overlap of approximately 15 cm.
Wavy slate can be laid in two of the most frequently used ways: in a run (with displacement) or with a cut of corners, as well as the combination of longitudinal edges. The choice of installation method depends on the modification of the roof:
- Laying with offset is used for floors with a narrow vertical and wide horizontal slope. The first sheet of the first row is fixed to the crate one step from the bar. The second is superimposed on the first with an overlap of one or two waves. And so on until the end of the first row. The next row is carpeted in the same way, but with an offset of half a sheet. Extreme in the second row of the fragments are cut along in half.
- If the plane of the coating is wide vertically and narrow horizontally, then laying with a cut of the corners is done. When connecting 4 sheets, it is necessary that they are placed as even as possible - this prevents the appearance of cracks. To do this, in 2 sheets placed diagonally, the corners are cut off, and these places are interconnected with a shift of 3 mm. The location of the corners, which make cuts, depends on the direction of installation. If laying is carried out from left to right, then in the lower row it is necessary to saw off only the left corner in the upper part, and in the upper - the right corner from the bottom. In the middle row, 2 corners are cut, located diagonally (upper left, lower right).
It is advisable to fix the coating to the crate with galvanized flat screws, approximately 10 cm long, and rubber pads. Professionals recommend purchasing screws with threads that do not reach the washer. Otherwise, slate can be damaged.
Note! For information, the 8-wave slate sheet is fixed with 2 screws on the second wave and the same number of screws along the sixth arc.
For cutting the corner, the intended place must be wetted with water - this will facilitate the cut and will not allow dust to rise. You can cut the material with a grinder or a regular file. This operation can be carried out in a different way: along the contour drawn with a pencil, holes are made at a small distance between each other, and the corner is broken off by a gentle hand press.
At the final stage of the roof device of slate, the ridge of metal sheet is mounted, and they are sealed with building foam gaps under the coating. The ridge is arranged in such a way that the metal overlaps the upper sheets of the roof, approximately 20 cm. The foam must be applied carefully so that its expansion does not lead to cracks in the slate.
The durability of the slate roof can be increased by painting the surface. Painted roof will look more attractive. You can apply acrylic, water-dispersed or alkyd paints for exterior works, each of which has its own individual advantages. Foamed gaps are primed and also painted. At the end of the work, the corner elements are fixed and processed, and the drain is mounted. An example of a professional installation of slate roof is shown in the video below.