Eht explores some basic roof framing techniques from layout to installation.
Roof bracing types.
Roof framing is one of those carpenter skills that appears quite complicated and indeed some roof designs are difficult.
Common rafter valley rafter valley jack rafter hip rafter hip jack rafter cripple jack rafter dormer rafter.
Applicable to all trussed rafter roofs unless rigid sarking such as timber boarding or plywood is used.
Bracing for roofs that are approximately square.
Roofs may require bracing.
Bracing between column lines provides load paths for the transference of horizontal forces to ground level.
Shed gable hip gambrel and mansard.
Collar ties rafter ties structural ridge beams.
Just as there are many types of roofs with many roof parts there are many different types of roof trusses this extensive article explains through a series of custom truss diagrams the different truss configurations you can use for various roofs.
Portal bracing is made up of two columns that attach between the frame liner to the structural frame with a beam connecting them.
Roof bracing is a pre punched v shaped component that fixes in an x or v pattern to the top of the top chord to firmly brace roof trusses to the building frame.
Trussing or triangulation is formed by inserting diagonal structural members into rectangular areas of a structural frame helping to stabilise the frame.
Pyramid hip roof roof bracing design a pyramid hip roof corresponds an easy hip roof however the wall surfaces are square as opposed to rectangle shaped making the form of the structure is roof incline involved a factor in a pyramid form on top.
While this article focuses on configurations we also have a very cool set of illustrations showcasing the different parts anatomy of roof trusses.
Bracing for larger roofs.
Diagonal rafter bracing should be approximately 45 to the rafters on plan.
If a single brace is used it must be sufficiently resistant to tension and compression.
Horizontal bracing is needed at each floor level however the floor system itself may provide sufficient resistance.
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Roofs may require bracing.
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In the instance that a metal building can t have cable or wind bracing the non panel shear brace will need to have portal bracing.