Fixing gym equipment to Thermalite Blocks

I would use threaded studs cut to length and chem fixed in, ensuring holes dust free

You could drill right through the blocks, use threaded studs to go through a metal plate with holes Drilled in the correct place, on the outside. Then tighten a nut on both ends of the stud.

Masonry drill holes out to 12mm Depth to around 90mm A’s block is 100mm. Cut lengths of 12 mm threaded bar being shore to cut as straight as possible to allow the nut to fit remove any burrs. Thoroughly hoover out the holes so no dust is left. Squeeze epoxy resin into holes one at a time this gear goes off quick so don’t mess around once hard in the nozzle that’s that one done. Insert threaded bar once in spin with your fingers to allow resin to move fully around threads, try to keep the bars as level as possible and to the same lengths this will make it easier to align anything you want to fix to them I e metal plates/flanges etc. Once fully hardened push plate/flanges over the threaded bar use 12mm washers and nuts and tighten. If the bar is too long angle grind off access clean off burrs job done 👍

If the out house is made from single skin Thermalite I would not attach anything to it that is going to add extra wheight