New build new

Cheers for the reply Dave. On further investigation the inner leaf is at finished floor level. As Keith said, it seems to be for the introduction of a stepped cavity tray. Yes I think so Keith. Would this be common practice or would it be on the drawing detail? Hi Brickie, thanks for reply. Yes I know these are footings. It appears that Keith is correct. The inner course is at ffl. The dpm will lap over and down onto the block on flat creating a tray. Then the outer leaf will be built up. thank u all.

Hi all, I'm a novice builder, except for labouring jobs during the summer when in college. I'm now looking at building a home office at the back of my garden. I plan on doing this myself. Originally I planned on building the rising walls in solid blocks on flat and the main structure in cavity blocks. From looking around it seems as if cavity walls are the preferred and better form of blockwork for construction i.e 100mm wall - 100mm cavity - 100mm wall. The problem I have now is how to construct the rising walls for this type of construction? Any pictures I've found seems to leave the outer leaf of the wall down by a half a block or even a full block. Could someone explain why this is to me?? Thanks.