Pitched Roof Timber Roof Construction Details

Ventilated batten void warm roof eaves 3 05 timber frame pitched roof.

Pitched roof timber roof construction details.

The pitch of a roof is its vertical rise divided by its horizontal span and is a measure of its steepness. This can be determined by the size of the timbers or the size of the roof. Pitched roofs are generally provided with a pitch of about 20 degrees to the horizontal for slates and 40 to 60 degrees for tiles. A truss roof using factory made trusses which are delivered to site complete and just erected.

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. Pitched roof timber sizes. Construction details of pitched roof. 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.

One pitched roof construction method is a cut roof method. The most commonly used types of pitched roof construction are the gable the hip the intersecting and the shed or lean to. While the gabled roof is always pitched in two directions the mono pitch always slants in a single direction. 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. 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. Roofs tend to be either pitched or flat and typically in residential construction timber is the most common material used. 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.

Ventilated batten void warm roof gable 3 06 timber frame timber flat roof 3 07 timber frame timber flat roof with parapet 3 08 timber frame lintel at window head 3 09 timber frame windows and doors jambs and. 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 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. The building regulations in the uk provide guidance on roof design.

They differ considerably from the conventional gabled roofs in shape and construction.