WHAT IS TRADITIONAL CUT ROOFING?
A traditional cut roof is exactly what it says on the tin, it is a roof where all elements are cut on site and tailored to each individual roof. The overall construction of a cut roof is to ensure the load imposed on it is evenly transmitted to the bearing points below.
The rafters are the main load bearing elements of the roof spanning from the wall plate to the ridge beam. The rafters are sometimes supported by purlins if the rafter length requires it, which act as a beam to support the rafter length. The purlins are supported by struts, which in turn are supported on an internal load bearing wall and the collar ties are used to connect the rafters which prevent them from spreading outwards. The collar ties and hangers are used to improve the overall strength and stability of the roof.
Traditional cut roofing is commonly used when a roof space is intended to be lived in and where the access of a crane is restricted.
WHAT ARE THE BENEFITS OF A TRADITIONAL CUT ROOFING?
No need for mechanical means such as a tele-handler or crane to load out material (roof size dependent)
Can create more room height on tighter buildings
Can be tailored made to any roof shape and size no matter how complex
Can later be adjusted to add Velux’s and or dormers
No need to worry about height restriction on access as all materials can be delivered on a flat bed
WHAT IS THE INSTALLATION PROCESS OF A TRADITIONAL CUT ROOFING?
Traditional cut roofing is the most flexible type of roofing as each individual structural member is purposely cut to size. Unlike truss roofing the need of mechanical lifting equipment is non-essential for unloading delivery vehicles and loading materials for the purpose of siting roof members into position.
The general procedure of works would be to fit timber wall plates to the top of the load bearing walls, ensure that they are perfectly straight, level & parallel to opposite walls, the plates will be fixed down to the structural walls with galvanised metal wall plate straps.
The Carpenter will then set out the roofing works depending upon the design marking where each rafter and joist will sit on the walls.
The pitched roof members such as common rafters, hip rafter & valley rafters will be accurately set out to suit the design intention with regard to the required pitch of the roof or the height of the ridge board that determines the top of the roof apex. This is often critical so that planning permissions are accurately adhered to.
Often the roof members will be marked out and cut to their finished lengths before being loaded up to the roof scaffold for fixing into position, this can be very convenient on a restrictive building site.
Usually the horizontal members that create the ceiling of the room below or the floor of a loft space such as beams, joists, trimming joists etc, would be installed first as these can then be temporary boarded and used as a working platform to reduce the risk of falling through the floor zone.
The pitched common rafters, hips, valleys etc would then be installed, often a working platform will be required to reach the apex of the roof depending on the scale of the building. Lightweight access scaffold systems will be used for this, sited from the floor joists and temporary working deck.
All roof members will be fixed in accordance to the structural engineer details regarding specification of ironworks, fixings and fastenings.
The roof will be inspected by Build control and the warranty provider prior to roof covering works commencing.
Payne Carpentry have extensive experience in the many types of traditional cut roofing. We manage our clients’ needs by providing time and cost saving solutions by carrying out the following compulsory works procedures as part of our standard service.
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