A gable roof has two slopes that meet at the ridge. This simple shape makes the roof covering easier to lay out and reduces the number of complex junctions. The shape alone does not determine the structure: the span, loads and intended use of the roof space all matter. The covering, insulation and layers that keep out water and control air leakage must be chosen for the particular roof. Rafters, collar ties, purlins and posts can be arranged in different ways; prefabricated trusses are another option. Each arrangement transfers loads to the walls and the rest of the building differently. Knowing that a roof has two slopes is not enough to specify timber sizes or the number of supports.

Whether insulation work qualifies for a grant depends on the scheme, the building, the work proposed and the thermal performance required of its walls or roof. An energy audit helps identify what needs improving and in what order. Use the findings to choose the insulation thickness and installation method and to prepare the cost estimate for the application. First check the current scheme rules for your building and the planned work. Eligibility can depend on ownership, building age, heating system, income or energy performance. Check current limits, deadlines and the documents required both for approval and for payment.

A roof calculator helps you organise measurements and estimate material quantities. Start by distinguishing the area of the roof slopes from the area of the sheets you will buy. Allow for overlaps, effective cover width, cuts and accessories. Before ordering, check the estimate against measurements of the actual roof and a sheet layout. Draw a roof plan showing the dimensions of every slope. Mark ridges, eaves, valleys and hips, and note the pitch and any projections. The building footprint measured at the walls omits the eaves. If the roof includes a dormer or covers an extension, include the smaller roof planes too.

Insurance for a house under construction should reflect the stage the work has reached. An open structure faces different risks from a building with a finished roof, windows and services. Compare premiums alongside the scope of cover, sum insured and exclusions. Ask whether the policy covers materials, weather damage and liability to third parties. A low premium can leave costly gaps. As work progresses, deliveries, completed work and newly installed equipment increase the value on site. Check that the insurer’s definition of a house under construction covers the building as it stands. Insurance intended for an occupied home may exclude an open shell without windows or completed services.