Roof framing in this chapter we will introduce you to the fundamentals of roof design and construction.
Timber roof structure construction.
A truss roof using factory made trusses which are delivered to site complete and just erected.
Except in group a e f 1 h i l m r 1 r 2 r 2 1 and s 1 occupancies high rise buildings and other applications listed in section 1 11 regulated by the office of the state fire marshal fire protection of primary structural.
Archibald timber structures started into business in 1981 and incorporated in 1984.
The main decision that needs to be made with erecting a roof is which material to use for its construction.
Timber is by far the most common material for house framing in australia.
They are designed by the manufacturer for each specific building.
Timber trusses also are built in a variety of styles using wood or metal joints.
For homebuilders a timber frame for a flat roof is usually the cheapest option and the easiest to build.
Timber vs metal frames.
The roof framing is the structure that supports your roof.
1 foot 304 8 mm.
The supporting structure and the covering.
Pre manufactured roof trusses come in a wide variety of styles.
There are two basic methods of pitched roof construction.
But before discussing roof framing we will first review some basic terms and definitions used in roof construction.
Heavy timber rafters typically spaced 240 cm 8 ft to 370 cm 12 ft apart are called principal rafters.
See more on sips.
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.
Except in group f 1 h m and s 1 occupancies fire protection of structural members in roof construction shall not be required including protection of primary structural frame members roof framing and decking.
Finishes for flat roofs are also more limited.
Trussed roofs are available in fink truss and open or attic truss options detailed below.
Fire resistance ratings of primary structural frame and bearing walls are permitted to be reduced by 1 hour where supporting a roof only.
There are two basic components of a timber roof.
This house s roof construction used prefabricated trusses from turner timber with dormer windows factored into the design on the front elevation image credit.
We also perform wood framing on projects where we are installing the roof structure and or floor system.
But this type of roof is seldom as attractive as the pitched form as it can result in a blocky stunted appearance.
The roof structure is integral to the design of the roof cassettes so trusses beams joists purlins etc.
Fire resistance ratings of primary structural frame and bearing walls are permitted to be reduced by 1 hour where supporting a roof only.
Uses relatively small timber sections.
Are not normally required.
