Steel Roof Structure Terminology

A roof that is formed by sloping planes from all four sides.

Steel roof structure terminology.

Architectural roofing is metal roofing systems that are non weightload bearing and must be installed over solid decking rather than battens or 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. According to the project characteristics the construction scheme of the roof steel structure follows the principle of subareas and substeps with the truss lifting in segmentation. Terminology applied to structural steel members the use of these members the methods by which they are connected and the basic sequence of events which occurs during erection.

Collar ties rafter ties tension beams structural ridge beams. Valley the internal angle formed by two inclined slopes of a roof. The line formed at the intersection of two adjacent sloping planes of a roof. Truss roof the prefabricated self supporting triangulated structural framework commonly used for all types of roofs.

This article describes and illustrates the different types of support that prevents roof sagging and wall bulging at buildings including definitions of collar ties rafter ties and structural ridge beams. Beams columns braces plate trusses and fasteners. The section has a web in the middle and two flanges. Structural steel having a yield stress in excess of 36 000 pounds per square inch.

The width of the flanges is usually between 1 5 times and 3 times less than the depth of the web. Structural steel the structural elements that make up the frame that are essential to supporting the design loads e g. Glossary of steel terminology. Some of these can support the roof and prevent ridge sagging and wall spreading.

A proprietary reidsteel name for a patented form of tied arch with pitched or parabolic roof slopes which can be used to span large spans cost effectively. In some instances they are also steel lengths measuring about an inch or so wide that have an elevated middle where one screws the metal roofing into. Sometimes called hat channel because of its shape. Eaves on a sloped roof the horizontal underside that projects out from the house wall.

The roof steel structure in the terminal 2 building of yancheng nanyang airport has a large span and a considerably difficult construction. 30 lb felt was the standard underlayment for quality metal roofing systems and is still used but has been replaced in many areas by the newer synthetic underlayments it is typically made of a polyester fleece and infused with tar. Batten or purlins can be 1 x2 x4 wood strips nailed to the roof or rafters upon which the roofing is attached.