Am I being thick? Got a drawing for temp roof , it’s a splayed building so they want it done with 3 separate tinned roofs. One each side and one just above in the middle which is wider one end than the other…the designer is saying use swivels for the purlins? Can’t see how that’s gonna work with the sheets? Am I missing something here?
Temp roof
- Thread starter Dyton88
- Start date
AshReactive
Well-known member
Yeah, swivels and sheets won't work very well, and even if you forced it so it did fit, you'd see a load of threads punched through your sheets wouldn't you. Not particularly waterproof that.
Splayed temporary roofs do certainly come with their difficulties though and I've only found two reliable ways round it.
1. All the beams go in the same orientation and are supported off ring beams.
This increases the spans a bit, but does ensure the sheets fit nicely. You just have to stagger / step them so you cover everything you need and don't cover too much fresh air. Setting out the ring beams is also not fun as each beam technically goes in at a different height to keep the angle of the roof correct, but puncheons, shorter ring beams and suitable bracing works to fix this. Just needs a fair bit of thought.
2. Go bigger.
The roof over a roof solution is probably the most common and probably similar to what you've already got designed, but you essentially just put square roofs 'over' each other until you've covered the whole building. You'll either need to build a separate support scaffold outside the lower roof or cantilever over depending on the overlap and the angle of the building.
There's also a third method which is putting all three roofs in at the same height, then bridging beams or tubes between the two edge roof beams to fill in the triangular gaps. I've seen this a few times, but it's horrible to erect and even worse to waterproof.
Splayed temporary roofs do certainly come with their difficulties though and I've only found two reliable ways round it.
1. All the beams go in the same orientation and are supported off ring beams.
This increases the spans a bit, but does ensure the sheets fit nicely. You just have to stagger / step them so you cover everything you need and don't cover too much fresh air. Setting out the ring beams is also not fun as each beam technically goes in at a different height to keep the angle of the roof correct, but puncheons, shorter ring beams and suitable bracing works to fix this. Just needs a fair bit of thought.
2. Go bigger.
The roof over a roof solution is probably the most common and probably similar to what you've already got designed, but you essentially just put square roofs 'over' each other until you've covered the whole building. You'll either need to build a separate support scaffold outside the lower roof or cantilever over depending on the overlap and the angle of the building.
There's also a third method which is putting all three roofs in at the same height, then bridging beams or tubes between the two edge roof beams to fill in the triangular gaps. I've seen this a few times, but it's horrible to erect and even worse to waterproof.