Enter the length and width of the building, the eaves overhang and the pitch. PRAXAO works out the roof area on the slope, then what covers it — tiles with their battens and ridge tiles, or profiled sheets with their purlins and screws — and the common rafters. The drawing shows the roof in 3D, in plan and in section.
Enter the dimensions to see the drawing.
Fill in the fields to see the result.
Preliminary estimate from the values entered: not a structural validation and not an execution plan. Check the local rules and the manufacturers’ data.
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Roof area on the slope: 88.91 m² · Length of a common rafter: 4.04 m · Common rafters: 40 · Ridge length: 11.00 m · Tiles to buy: 1201 · Battens, total length: 277.85 m · Ridge and hip tiles: 28
No. It counts what a set of dimensions requires. The pitch a covering needs, the timber sizes, the wind and snow loads and the fixings come from the maker’s data and the engineer.
The plan area, overhang included, is divided by the cosine of the pitch. A hip roof with equal slopes has the same area as a gable roof on the same plan.
One tile covers its gauge (length minus overlap) times its cover width. The roof area is increased by the waste percentage, divided by that, and rounded up to whole tiles.
Slope area, tiles or sheets, battens or purlins, rafters and ridge: the method to order a roof, with an example.
Wooden doors, windows and boards (decking, cladding): timber volume and lengths, board sheets and glass, from your dimensions.
Membrane rolls and primer to waterproof a flat roof or terrace, with upstands, side laps and waste.
Blocks or bricks, mortar and cement bags for a wall, with openings deducted and a breakage margin.