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Can anyone tell me what these blocks are called/made from? They're in my 1950's ex council house, mainly internal walls but have seen them in the inner leaf of the cavity wall too. They're only 60-70mm thick, look aerated judging by the hole-y inside appearance and really difficult to get a strong fitting into as it just crumbles away.
I want to hang a very large and heavy picture frame on a wall made entirely from them so was thinking either:
Option 1 - self-tapping concrete screws (https://www.screwfix.com/p/easydrive-tx-countersunk-concrete-screws-7-5mm-x-60mm-100-pack/3313h) as I managed to get some good fittings holding the skirting boards on with these if I drilled an smaller hole than on the instructions
Option 2 - some big 50mm rawl plug held in firmly with some gripfill or similar
For extra security I will do two fixings 300mm apart - is this enough?
I want to hang a very large and heavy picture frame on a wall made entirely from them so was thinking either:
Option 1 - self-tapping concrete screws (https://www.screwfix.com/p/easydrive-tx-countersunk-concrete-screws-7-5mm-x-60mm-100-pack/3313h) as I managed to get some good fittings holding the skirting boards on with these if I drilled an smaller hole than on the instructions
Option 2 - some big 50mm rawl plug held in firmly with some gripfill or similar
For extra security I will do two fixings 300mm apart - is this enough?