The choice of carpentry connectors is determined by the roof truss design, not by the roofing type alone. It is worth checking what forces a given node must transfer, what the load direction and substrate are, and whether the catalogue load capacity matches the intended installation and fasteners. In an order, a precise description of the fitting matters more than a general term, because similar components may have different parameters. Traditional timber joints and steel fittings serve different functions, so the designer decides on their use.

A hipped roof encloses the building with four slopes: two trapezoidal and two triangular. This arrangement suits a simple building form well, yet it multiplies the corners and covering cut-offs. The designer matches the truss to the span and loads. When choosing metal roof tiles, establish the covering area, the waste at corners and the full set of flashings – the footprint area alone will not suffice for ordering material. On a rectangular building, the larger slopes meet at the ridge, while the shorter sides are closed by triangular slopes. Their convex junctions are corners, not valleys.

The choice of roofing is determined above all by the roof pitch, the structure and shape of the roof, and how the attic will be used — not by appearance or price per square metre alone. Check whether the chosen system holds the required approval for the specific pitch, how the substrate and joints are resolved, and whether the trade name really corresponds to the given profile. When replacing a covering, inspect the roof trusses and allow for loads from snow, wind and any photovoltaic installation. Compare two full quotations for the same project, covering flashings, fixings, transport and labour.