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I could possibly put a new beam under the struts, tied into the party wall and supported at one of the load bearing walls toward the other end. If I did this, and put a plywood facing on the rear of the struts, this should spread the load sufficiently to avoid too much joist deflection. Its...

Thanks for these opinions. I realise that purlins and collars have different purposes; that is why I suggested taking the horizontal load via the collars, and the vertical load by means of struts beneath the rafters supporting them from the joists below (probably actually from a cross-beam...

Thanks, I have reposted the query on that forum.

I have been advised on the loft forum to seek assistance from "shytalkz" on this issue I have a 1930s semi with a large hip roof. It has purlins on each of the 3 slopes supporting the 4x2 rafters. These purlins are themselves supported by centrally positioned diagonal timber struts to load...

Sorry, I'm new to this forum; how do I do that?? :?

Thanks for this. It's a trip to my favorite structural engineer then!! I guess I had hoped that someone who had done something similar would be able to say if what I was talking about was sane or insane 8-)

I have a 1930s semi with a large hip roof. It has purlins on each of the 3 slopes supporting the 4x2 rafters. These purlins are themselves supported by centrally positioned diagonal timber struts to load bearing walls. I would like to make an "occasional use" hobby room in this loft, and to...