Structural Timber Flat Roof Construction Details

But now flat roofs often are constructed with fewer layers because of improved waterproofing technology.

Structural timber flat roof construction details.

Besides the various loads acting on the flat roof the chapters of this section discuss potential primary structures and. Part b structure investigates the structural aspects of flat roofs. 2306 4 3 particleboard shear walls. Some observers suggest it s harder to replace a flat roof than a traditional pitched shingle roof because of the labor required to remove its layers especially on older flat roofs.

Pre manufactured roof trusses come in a wide variety of styles. Heavy timber rafters typically spaced 240 cm 8 ft to 370 cm 12 ft apart are called principal rafters. Some of these can support the roof and prevent ridge sagging and wall spreading. Joists are placed on edge spaced at 400 600mm centres supported by external and internal load bearing walls.

The construction and allowable load provisions of sections 2306 3 4 and 2306 3 5. The design shear ca pacity of particleboard shear walls shall be in accordance 2003 international building code 467 wood table 2306 3 1 continued recommended shear pounds per foot for wood structural. 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. They are designed by the manufacturer for each specific building.

Flat roofs are hard to replace. Flat roofs aren t architecturally logical as rain and snow will shed much more quickly off a sloped roof. The construction of the flat roof is similar to that of the timber upper floor. This will give additional stability to the roof structure.

Timber trusses also are built in a variety of styles using wood or metal joints. The steels or rsj s rolled steel joists are often built into one or both walls to give added stability to the roof structure. Collar ties rafter ties tension beams structural ridge beams. The basic construction of a flat roof starts with roofing timber that is laid across two upright items usually two walls.

Trada and approved document part a give guidance on sizes of joists for flat roofs relating to spans and loading. For additional stability you can also use steel joists that are built into one or both of the walls. On a basic level flat roof construction comes in the form of roofing timbers or joists as they are more commonly known or steels that are laid across two uprights walls in most cases. Of course you don t need to live in a modern house to deal with a flat roof.