Purlin
A horizontal beam along the length of a roof that rests on principals (pairs of angled supporting beams that meet at the top) and supports the common rafters to prevent sagging.
A horizontal beam along the length of a roof that rests on principals (pairs of angled supporting beams that meet at the top) and supports the common rafters to prevent sagging.
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1. Builders
2. Scaffolding
3. Contractors
4. Architects
8. Bricklayers
10. Extensions
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