Pitched Roof Timber Roof Construction Details

A pitched roof is a roof that slopes downwards typically in two parts at an angle from a central ridge but sometimes in one part from one edge to another.

Pitched roof timber roof construction details.

They differ considerably from the conventional gabled roofs in shape and construction. A truss roof using factory made trusses which are delivered to site complete and just erected. There are two basic methods of pitched roof construction. This is more of a traditional manner in regards to cutting the timber while onsite and building up the roof by the use of rafters ridge boards joists and purlins among others.

Pitched roofs are generally provided with a pitch of about 20 degrees to the horizontal for slates and 40 to 60 degrees for tiles. Construction details of pitched roof. The following tables give details of the allowable spans and spacing for some of the more common timber sizes used in traditional roofing construction. The most commonly used types of pitched roof construction are the gable the hip the intersecting and the shed or lean to.

Pitched roof timber sizes. The pitch of a roof is its vertical rise divided by its horizontal span and is a measure of its steepness. The roof is a key element of the building structure providing protection from the elements and has a vital role in reducing heat loss from the building. This can be determined by the size of the timbers or the size of the roof.

The majority of houses with pitched roofs will have what is now called a cold roof where insulation is laid on the floor of the loft area immediately above the ceiling of the upstairs rooms of the house. An example of each is shown in figure 2 1. Mono pitched roofs are also known by the names of skillion roofs shed roofs pent roof and lean to roof. A cut roof this is the traditional method of cutting the timber on site and building up the roof using rafters ridge boards joists and purlins etc the exact details being determined by the size of roof size of timbers etc.

Ventilated batten void warm roof eaves 3 05 timber frame pitched roof. One pitched roof construction method is a cut roof method. 3 04 timber frame pitched roof. The building regulations in the uk provide guidance on roof design.

The minimum pitching or sloping degree for the roof is decided by the minimum slope necessary for excluding the roof covering and drain rainwater to eaves or valley gutter.