Supporting loft purlins with struts...angle issues

Assuming you accept the strut at an angle is acceptable :cautious:, if gravity is acting downwards wouldn't that strut need to be the other way round , that is with the notch out of the wood at the top so the purlin bears on to the ' meat ' of the wood :?::!:
 
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Leofric said:
Assuming you accept the strut at an angle is acceptable :cautious:, if gravity is acting downwards wouldn't that strut need to be the other way round , that is with the notch out of the wood at the top so the purlin bears on to the ' meat ' of the wood :?::!:
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Ideally, yes, but then I should really be living in the Bahamas and not Manchester.
 
Leofric said:
if gravity is acting downwards wouldn't that strut need to be
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That's interesting, I'd always assumed in a triangulated roof, the purlins and struts were to prevent the rafters deflecting rather than support them against gravity. The ceiling ties wouldn't really stretch so the point supported by the purlin would not go straight down but keep the same distance from the rafter feet. Hence the force would act perpendicular to the rafters rather than downwards.
In a roof with a ridge beam or similar i understand that all the forces would be vertical, and i don't think it's clear what kind of roof this is (as a diyer!)

Any thought I'd be interested in whether that makes sense?
 
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