Moment Frame Pitched Roof

Robin is working on an extension so we thought we d shadow him for the day and see how he creates a pitched roof or semi pitched roof leading up to a flat.

Moment frame pitched roof.

To frame this style roof hip trusses are utilized from the main peak of the building stepping down with a flat top chord. Mono the mono roof is a single very low pitched roof used mostly on contemporary homes. In this design each side of the building has a roof pitch and eave. Pitched roofs are generally used where rainfall is heavy.

It uses a single mono truss 1 and often has a pitch lower than 3 inches per foot 2 making it easy to roof but hard to maintain. The pitch of a roof is its vertical rise divided by its horizontal span and is a measure of its steepness. However in practise they tend to be much shallower commonly being expressed as a gradient and can be anywhere from 1 40 to 1 80. The anatomy of a steel portal frame can be broken down into four key in plane components.

A pitched roof is in contrast to a flat roof which technically is any roof with a slope less than 10. If buildings are constructed with some limited width then also we can go for pitched roofs. D connections between rafter and column eave joints and splice in the rafter at apex apex joint. A hip set is then used to frame the 6 or 8 feet nearest the end wall.

The flat portion is increased the nearer the truss is to the end wall. The roof pitch is typically set to 5 10º with portalised bays at 6 8m centres longitudinally.