Good morning,
Thanks for your reply PeterW. We are using the Timber Beam calculator and are very pleased with the program as well as with the team behind it. We gave them a ring with a few questions and they were very helpful.
With their advice, we've decided to go for a flitch beam, which would be more than sufficient.
We've also checked the compressive load on the timber frame using the Timber Beam calculator and it's more than adequate. We will, nevertheless, quadruple up the uprights either side of the doors just for our own peace of mind.
We calculated the roof loading ourselves. We've checked again and keep getting the same.
We are using 72x220 joists at 400 centres and doubling up either side of the roof lights, which seems incredibly excessive. Any thoughts on that? Do we really need to double up the whole joist? Or could we get away with just doubling up the trimmers?
Also, any idea on what's the best way of attaching the trimmers? I guess joist hangers?