Roof Terminology Purlin

Types of roof trusses.

Roof terminology purlin.

Homes with gambrel roofs. In architecture structural engineering or building a purlin or historically purline purloyne purling perling is any longitudinal horizontal structural member in a roof except a type of framing with what is called a crown plate. Purlins these run horizontally and parallel to the ridge beam and perpendicular to the roof slope. Metal building purlin spacing metal roofs are often referred as tin roofs in the past because of the use of tin such as aluminum or stainless steel sheets as the materials.

Purlin plates under purlin principal purlins and common purlins. An l shaped metal strip positioned along a roof s edges to allow water to run off the roof without running down the eaves or siding. A roof that has two pitches on each slope. Parts of a roof gutter.

The slope of a roof. These roofs often include living accommodation in the roof void. They are fixed on top of the rafters and help prevent roof sag. Eaves on a sloped roof the horizontal underside that projects out from the house wall.

A low wall that projects beyond the eves at the edge of a roof. Serves for avoiding concentrated loading of the tie beams of principal trusses. The longitudinal horizontal beam that is sitting on a post or the principal rafter of a truss and used to support common rafters. They are fixed on top of the rafters and help prevent roof sag.

There are three types of purlins in wood construction. Purlins can be wood strips 1 x 2 or can metal and are usually a 1 subgirt material preferably galvanized steel. Compared to conventional roofing system it might be a bit pricier in terms of installation but also has longer durability to provide better value for the future. Horizontal longitudinal member of a roof resting on the tie beams or on collar beams and supporting collar struts or principal rafters.