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How many trusses do you need for a 30wx45lx15h garage?
For a gable end to gable end installation on 16" spacing you would need 34 trusses, 2 of which would be the gables. If your roof-line has hip ends or will be incorporated into an existing structure there will be more trusses.
What is the Maximum overhang allowed on a scaffold boards?
1/2n
Why do trusses deflect?
Roof trusses are designed to counter the weight imposed on them. If your roof is completed tiled EC. and looks out of shape. I could be. Wrong design/ trusses too wide apart/ roofs 600mm apart tended to sag between/ the load bearing partition under truss higher than external walls. seen this before completely distorted the whole roof.
How much of an overhang is needed to protect a south facing window from summer sun?
How much of an overhang needed depends on how big your property (and especially your south facing window) is. You'll need to get an expert on this matter to check out your house and then you'll know.
What is better a roof truss or rafter?
They each have their place, but on the same style roof, trusses would be stronger.
