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it would be less than 150 above ground and not line up with original dpm

I'm self building a porch, have done some bricklaying in the past but very much a keen amateur ! I've made the mistake of not gauging DOWN from DPC top level so when I checked my levels after raking back 3 courses of first corner i found my top level was going to be short by 10mm, can I make up...

I've got an extension to do at the rear so using the porch as a bit of practice and also to keep all materials the same, that's why I took the decision to go with the 265 blocks same as rear extension :D . For info the blocks are celcon solar

Detail drawing shows cavity filled to top, but when I queried with the architect who drew the details he said I can if i want or not bother ??! I'm thinking solid wall above why not be solid below ie cavity filled ?

What mix should I use ? And do i need any wall ties in there ?

I am self building a porch, have laid trench fill foundations now ready to lay DPC - 3 courses below ground, 2 above all in class B's. My drawings show the 2 skins tied and filled with lean concrete, are these both necessary ? Above DPC the walls will be solid blocks 265mm wide so no cavity...