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I didn’t think they needed tying below dpc? The space I’m talking about filling is really just the space below finished ground level to prevent the skins collapsing in. Should I be using ties there also?

I thought it might be quicker and easier if I could build both skins then drop the blocks in between and put some not too wet mortar on top chamfered to the outside. There is also a drain that I am having to bridge and I thought it would be a good way of avoiding filling that space?

Hi all, I’m self building a small extension. The trenches are dug and concrete footing poured. I’m building the inner and outer skins using 100mm concrete blocks with a 100mm cavity. Rather than mix concrete to fill the cavity, can I fill the cavity with concrete blocks and mortar? Thanks...