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Edit, I personally detest all chemical anchors and try to avoid using them at all cost. As said above, they are quite finicky to use correctly and I have had many a discussion with a structural...

I would suggest that your Rib Raft floor isn't what it seems if you hit aggregate? Like was said up further rib raft is around 85mm slab with ribs over 2-300mm thick polystyrene pods over damp proof...

Sorry Mauser308, I should have been clearer. I was laughing at "chemset" being referred to as one simple product, where as it is one of 100s of chemical anchors. I was also laughing at the idea that...

It is funny watching DIYers talk about fixing steel to concrete. Chemset lol