I'm going to be building some heavy duty shelves in the basement, attached to concrete block. The horizontal supports will be 2x4s, with 5/8 material for shelves. My plan was to attach the 2x4s to the block using tapcons. Pre-drill through the 2x4s, then since the longest length tapcons I can find are 2
3/4, I was going to counter sink them into the 2x4 about 1/2". Here is the question. Am I better off going into the block, or the mortar joint? I've got a hammer drill, so that isn't an issue. I'm thinking into the block, rather than the mortar, would be a stronger fit. Each set of shelves will be 8' long, 2' wide. I was going to use 5 tapcons per 8' section into the wall. Open to suggestions. I've built these same shelves every house we've lived in, but in the garage attached to the studs. First time trying with concrete block.Thanks,