Hi all, I just wanted to check with the more knowledgeable whether the following project is workable and safe. I'm looking to create a 3m2 mezzanine floor in my garage by hanging 2" x 6" joists at 450mm centres from 2 ledgers fixed to 100mm thermalite block using m12 x 160mm threaded rod set into polyester resin at a depth of 80mm and then through the 50mm of ledger board. Both the joists and ledgers are c16 quality timber. Once hung from 45mm x 145mm hangers, attached to the ledgers, I'll look to board with 18mm chipboard. My main concern (having not much structural knowledge) is that the thermalite block and bolt can take the total live weight (which I've calculated at about 30 lbs/ft2) and the ongoing shearing effect through the horizontal bolt. The mezzanine will be used as a loft type space for storage with the obvious need to take a person's weight to put things away and get them out. And advice is appreciated. Regards Danny
Mark a level line all the way around where the top of the joists would be ideally, then mark at 400 centres not 450 and cut out slots in the wall with an angle grinder where the joists are to go and slot in masonry joist hangers, wedge them in tight with slate or thin timber wedges then point it all up with mortar and let it go off. Once gone off cut and fit your joists. Don't bother with noggins if the span is under two and a half metres.
You will struggle to get a good fixing into thermalite, joist hangers in the mortar course would be better and less fuss.
Thanks for the reply guys, appreciated. So the idea of resin at a depth of 80 / 90mm into the thermalite is a no go then? Just out of interest what would cause ot to fail because there is no risk of the fixing coming out as all the weight is downward. Surely it will just shear off if anything? Regards and thanks again Danny
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