Pitched Roof Timber Roof Construction Details

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

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 roofs are generally provided with a pitch of about 20 degrees to the horizontal for slates and 40 to 60 degrees for tiles. Roofs tend to be either pitched or flat and typically in residential construction timber is the most common material used. 3 04 timber frame pitched roof.

The pitch of a roof is its vertical rise divided by its horizontal span and is a measure of its steepness. 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. While the gabled roof is always pitched in two directions the mono pitch always slants in a single direction. Construction details of pitched roof.

Mono pitched roofs are also known by the names of skillion roofs shed roofs pent roof and lean to 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. There are two basic methods of pitched roof construction. Ventilated batten void warm roof eaves 3 05 timber frame 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 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. 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. A truss roof using factory made trusses which are delivered to site complete and just erected.

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. This can be determined by the size of the timbers or the size of the roof. 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.

An example of each is shown in figure 2 1.