Pitched Roof Construction Advice

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19 Oct 2009
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Cheshire
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Can you guys give me some advice on pitched ridged roof construction please.

Single storey 6m wide x 4m extension, will I get away with a timber roof ridge or would it be best to go with steel ?

Secondly if I went for a vaulted ceiling would I need to add purlins for additional support ?

I want 2 of the 3 sides of the extension to be mainly glazed so unsure on roof spread also.

Thanks in advance.
 
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Single storey 6m wide x 4m extension, will I get away with a timber roof ridge or would it be best to go with steel ?
A timber ridge board is fine with a standard pitched roof.

Secondly if I went for a vaulted ceiling would I need to add purlins for additional support ?
You will most likely need to fix a steel ridge in this instance. The use of purlins will depend upon rafter span and preferred/practical timber section.

I want 2 of the 3 sides of the extension to be mainly glazed so unsure on roof spread also.
Mmmm. You may hit a large stumbling block here both structurally and with building regulations.
 
A pitched roof is a roof for which one or more roof surfaces is pitched more than 10 degrees, and alternately a roof with two slopes that meet at a central ridge.The shape of roofs differs greatly from region to region. The main factors which influence the shape of roofs are the climate and the materials available for roof structure and the outer covering.Roofs vary from almost flat to steeply pitched. They can be arched or dome. They can be a single flat sheet or a complex arrangement of slopes, gables and hips.I think that I will use my experience to set the parameters and say that an average One story home (2-3 bedrooms) would be around 1,600 SF, making the math simpler, we'll say the dimensions are 40'x40'.
 
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