Roof Construction
There are generally two ways to construct roofs on domestic buildings
1. Pitched Roof
Pitched Roofs are constructed from roof members that are generally set out, marked, cut and erected on site from lengths of material.
2. Trusses (Not covered in the section)
Trusses are Prefabricated roof frames that are fabricated off-site at a Frame and Truss plant, and assembled on site.
Domestic Roof construction must adhere to the minimum requirements outlined in the NCC (National Construction Code) and the appropriate Australian Standard.
1. Pitched Roof
Pitched Roofs are constructed from roof members that are generally set out, marked, cut and erected on site from lengths of material.
2. Trusses (Not covered in the section)
Trusses are Prefabricated roof frames that are fabricated off-site at a Frame and Truss plant, and assembled on site.
Domestic Roof construction must adhere to the minimum requirements outlined in the NCC (National Construction Code) and the appropriate Australian Standard.
Appropriate Reference material
The Building Code of Australia, now known as the NCC (National Construction Code)
The NCC is free for use online, which can be accessed from the Australian Building Codes Board website (registration required) at http://www.abcb.gov.au/
The appropriate Australian Standard is A.S.1684
A.S.1684 is available for a fee from the SIA Global website at http://infostore.saiglobal.com/store/
The NCC is free for use online, which can be accessed from the Australian Building Codes Board website (registration required) at http://www.abcb.gov.au/
The appropriate Australian Standard is A.S.1684
A.S.1684 is available for a fee from the SIA Global website at http://infostore.saiglobal.com/store/
Pitched Roof methods of construction
There are two methods of constructing a Pitched Roof
1. Coupled Roof
2. Non-coupled Roof
A Coupled Roof is a roof where the Ceiling Joists of the Ceiling Frame are fixed to the "feet" of the Rafters, which act like a tie to hold the feet of the rafters in position stopping the rafters feet from spreading and causing the roof to sag and walls to lean outwards.
A Non-coupled Roof is a roof that is constructed with a "Ridge Beam", the Ridge Beam holds the rafters up, preventing the roof from sagging, this type of construction is used in buildings with ceilings that are commonly known as "Cathedral ceilings", where essentially the underside of the rafters become the ceiling frame.
1. Coupled Roof
2. Non-coupled Roof
A Coupled Roof is a roof where the Ceiling Joists of the Ceiling Frame are fixed to the "feet" of the Rafters, which act like a tie to hold the feet of the rafters in position stopping the rafters feet from spreading and causing the roof to sag and walls to lean outwards.
A Non-coupled Roof is a roof that is constructed with a "Ridge Beam", the Ridge Beam holds the rafters up, preventing the roof from sagging, this type of construction is used in buildings with ceilings that are commonly known as "Cathedral ceilings", where essentially the underside of the rafters become the ceiling frame.
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