Dormer windows require their own mini roofs and great care must be given to their detailing and construction.
Traditional hand cut roofs.
This is a great option for buildings with more complex layout than a simple rectangular of square and is a type of roof that will hold well in rain snow or windy conditions.
Not only is the volume large enough to convert into living space but the structure can generally be easily altered.
Tin snips can also cut through drip edges and gutters and they are available in right and left hand orientations.
The timbers are often 400mm or so centres and vary in size according to span.
There are two basic methods of pitched roof construction.
A traditional method of cutting timber on site and building up the roof using rafters joists purlins ridge boards etc.
Before you start cutting you first need to determine how long your roof rafters need to be and the angles at which you ll cut the top and bottom of the rafter.
The traditional option is steeply pitched rarely less than 35.
The best tin snips are good for cutting any edge of corrugated iron that is going to be seen as they are easy to control when cutting.
The roof can be cut in the traditional way or fabricated from mono trusses.
You want a pair of straight cuts or left or right handed pair for cutting both straight and around corners.
A cross hipped roof is a common roof type with perpendicular hip sections that form an l or t shape in the roof hip.
The cheapest way to cut metal roofing is with a pair of tin snips.
Traditional or cut roof.
A truss roof using factory made trusses which are delivered to site complete and just erected.
Measure as precisely as possible down to the 1 4 inch 0 64 cm 1 8 inch 0 32 cm or 1 16 inch 0 16 cm.
Tin snips tin snips are ideal for cutting the thin metal materials found on a roof such as flashing.
The finished structure is readily adaptable.
Use a tape measure to measure the entire width of your building.
Prefabricated trusses which are delivered to site and erected.
Every member of a traditional cut roof is individually cut and assembled on site.
The rafters are the main load bearing elements of the roof.
They span from the wallplate to the ridge board providing a platform for the underlay battens and tiles.
This reflects the weatherproofing requirements of older roofing materials like thatch and peg tiles.
Traditional or cut roofs usually comprise a series of sloping timbers rafters fixed to a wall plate at their feet and a ridge board or possibly a wall plate at their head.
50mm wide by 75mm 100mm or 125mm deep are all common.
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.
