Hi all, I'm undertaking a fairly ambitious project (For me, anyway) and DIY building an extension. When the first BCO came around we had a chat and he told me "not to worry" about vertical DPC's. At the time I thought that was an easy win, but now I'm about to start laying I'm getting a bit nervous/paranoid. Situation is: Existing House: Solid brick, double skin wall. Standard slate DPC, then a normal course of bricks, then another course with injected damp proofing. We fully renovated the house several years ago and have had no issues with damp. New extension: Conventional cavity wall, tied in using wall starters. FFL is between the slate and injected dpc: https://imgur.com/1cNer8K (Ignore the ground level being too high there, it'll get sorted) So my new DPC is going to be in the same place as the FFL - what do I need to do to ensure there's no DPC bridging here? Am I worrying over nothing?