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Having been round the loop with the calculations it's interesting to see how close new joints are to the original designs. Certainly the joint designs aren't something I've overly worried about. I'm much happier with hand tools than power tools.. but my arms aren't.. so I'm coming down to...

I'll admit part of me just wants to have a go at an oak frame... but also I'm very nervous of steel in this construction as Observatories have a bad habit of getting very damp. When I'm imaging water can be almost running off the scope there's so much dew, in cold conditions I end up looking...

Thanks for all the feedback.. I've now got my first design modification, anyway.. Now that I'm up to 3 posts.. I can post a sketch. Note, the eaves beams are acting as roof ties, the crown ties stablalise the structure, allowing the use of the space between the eaves beams and the crown...

Wow.. that porch is quite something, thanks for posting, real inspiration. Yes I'm expecting the oak to move, but I think I can control things.. I'm anticipating 5% radially across grain, 10% round the grain, and about 0.5% along the grain. Both my gate posts are 1/2 sawn, although the core...

Thanks for the link, that could be helpful, I've found a lot of US stuff which has helped with the design, but hadn't found that forum. RE 8m.. there is a requirement for that beam not to have any major wiggles in it.. hence 1/4 sawn and one piece. I'm building a roll off roof observatory...

Hi. I'm new here, attracted by many of the knowledgeable posts I've seen in other threads. I'm looking at making a small oak framed building.. a glorified shed. I'm an engineer by training and temperament and tackled a wide variety of jobs. Early this year I handled oak for the first time...