One person without roofer skills can make installation of polymer-sand tile.
During installation you can safely walk on the roof, because tile is shock-resistant material (permissive loading on the bend section is up to 150 kilogram-force). Besides, owing to the properties of the roofing material, you do not need to spend money on additional heat and sound insulation. Below we provide general advice on the arrangement of the roof of polymer-sand tile.
1. Preparatory work
The tiled roofing is installed over wooden rafter systems.
There is an opinion that a major restriction in the application of polymer tile is its heavy weight (compared to metal tile roofing and other light materials), which requires a firm roof frame and extra expenses for sheathing. But in fact it is a mistake. The deadweight of tile is not large compared to, for example, that of snow or wind load. Simple calculation shows that the design load of the the polymer-tile roof is not heavier than of light roofing materials.
Taking into account that 1 square meter of tile weights not more that 22 kg, you do not need reinforcing the rafter framework of the roof, and you can use timber from 50x150mm to 60x180 mm. The rafter framework must be of dry wood (moisture content should not exceed 15%).
Rafter spacing is from 600 to 1200 mm, depending on the roof angle. If the angle of the roof is more than 45 °, rafter spacing increase to 1000-1200mm, if the angle is small, the rafter spacing is reduced to 800-600mm. The roof angle can be from 20 °.
Installation of tile roofing with an additional insulating layer is recommended. To protect the attic space against dust, soot, rain and snow moisture and to provide the ventilation of water vapor going from the interior of the building, it is recommended to use the vapor barrier film with micro perforations. Using water barrier film implies the use of special waterproof material with the high tensile strength.
Sheathing is made of wooden planks with rectangular sections with the sizes of 50x50, 60x40, the very first plank below should be 20 mm more.
Recommended space between the planks of sheathing is 350 mm.
2. Laying the tiles
Lay the first and last rows of shingles without fixing. Make marks on the sheathing at the level of every 3 ... 5 vertical columns.
Installation of tiles is made starting from the bottom row. The tile preferably has a row of recesses down the back thereof and the spacing of the recesses corresponds to the spacing of the projections on the tile. Also, shingles cling with side-locks so as to form a continuous carpet and to eliminated leaks.
Attach the shingles to the sheathing with screws through a special technological openings on the top of a tile, the diameter of an opening is 4 mm, and the length is 45-60mm.
After placing every third row check the horizontal and vertical symmetry. For an equal load on the building walls, tiling should be carried out simultaneously on all the slopes of the roof. Cutting tiles should be done with a angle grinder or with a hacksaw. It is recommended to water tiles after cutting and drilling. Even if the roof has complicated shapes, the waste of roof tiles will be minimal.
Operational properties of polymer-sand tile allow, to use both organized drainage system and informal drainage, that is, water can drain from the roof directly on the ground. Unorganized drainage is good only in for small building with a pent roof, and the eaves must be at least 60 cm.
For the organized drainage of the polymer-sand roof it is possible to use traditional systems (galvanized iron, aluminum, asbestos) as well as modern systems, made of galvanized steel with polymer coating and PVC.