Lower roof tie beam / ceiling joist fixing

I would use threaded bar with timber connectors and a 50mm plate square washers. I would check with your structural engineer the diameter of the bolt, I would suggest 12mm. I have used uk stainlessdirect.co.uk for bar washers etc and have found prices competitive.hope this info maybe of some help.Normally I would put the tie beam at the side of the corresponding rafter and bolt through using timber connector. If in doubt it would be best to get advice from your structural engineer.

I would have gone for a higher grade of c32! Really you should refer yourself back to the engineer as its their responsibility to advise so the works are fit for purpose. In the past I've used two 4" 12'ś screws at each end drilled and counter sunk for best practice, but saying that I would now use heavy duty sabre brackets from any building merchants or screwfix and use 2" 10ś screws to fix them so you have extra fasteners. Also belts and braces I know you could use plywood gussets along the ridge on each pairing of rafters to prevent spread even further. Hope I haven't baffled you even more Dave Myers Dce Joinery and Building

A secure easy fix for this problem would be to cut your 47x150 timbers to the required lengths for each joist/rafter and use 2 75mm timberlock screws at either end. Check with your structural engineer that this is a suitable fix as different engineers will have varied solutions. Hope that helps.

Hi it sounds like you have found the correct timber usually the engineer would give you preferred fixing which you could purchase from a good ironmongery company or builders merchant just make sure you don't try to cut corners or it will come back at you thanks