As with most things, variables will influence your outcome, such as wood type and weather encountered. In general the maximum distance between posts is 15'
how far apart should screws be placed ina metal roof
You can see the rafters of the roof very clearly here.
At the peak of the roof where the rafters meet instead of the rafters meeting each other, there is a beam between them that they rest against. It runs the length of the roof peak.
The horizontal board that connects two rafters on opposite sides of a ridge board is called a collar tie. It helps to stabilize the rafters and prevent them from spreading apart, ensuring the structural integrity of the roof.
in need of rafters on my roof,before i can have it weatherized
A longitudinal member in a roof frame, usually for supporting common rafters or the like between the plate and the ridge. One of several horizontal timbers supporting the rafters of a roof. http://www.bw-industries.co.uk/roof-purlins.htm
A longitudinal member in a roof frame, usually for supporting common rafters or the like between the plate and the ridge. One of several horizontal timbers supporting the rafters of a roof. http://www.bw-industries.co.uk/roof-purlins.htm
A purlin is a structural part of a roof which is used to support rafters and carry the roof cladding By supporting the rafters they allow for longer roof spans to be created allowing for wider buildings to be created.
In most cases 2 ft.
Poplar.
You could have foam sprayed on the underneath side. The rafters are probably 3 or 4 feet apart so you can't use regular fiberglass insulation unless you add rafters. You can glue rigid foam panels to the strips. The roof sweats because the air inside comes in contact with it. Any insulation and a vapor barrier should stop this from happening.
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