How to build a Roof Purlins and Rafters
This leaflet gives the size of wood purlins and rafters needed for low-human-occupancy farm buildings. Purlins are horizontal roof members that span the trusses or rafters and support the roof cladding. Rafters are sloped-roof frame members that usually extend from plate-to-ridge, or, in the case of small shed roofs, from plate-to-plate. Both the structural and functional design of purlins and rafters are important
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