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Is it possible to go overboard with wall ties....already spent £30 and only four courses up on a smallish build?

When using 4inch blocks to return a wall over cavity around windows or doorframes should I use 6inch or 9" DPC? Where should the DPC lap back? i.e. should it lap back on both sides for example back into the door frame?

Please can someone help with this from a structural perspective, my foundation walls and external/internal above ground walls have matching perps in many places (two inexperienced blocklayers = one problem) //www.diynot.com/network/smarties/albums/ The diagram above is in my images in...

Project Garage/shed - 4inch cavity walls, with ties. Friend works - foundations dug, 1st blocks laid with ties etc, subbase compacted, base poured(4 inches) to groundfloor height. I get to work...DPM overlapped by DPC - above ground blockwork started - PROBLEM.... now at window height...

my friend has made a mess already of his self build 2 car garage. He has laid the 4 inch floor slab within his 2 block high, cavity walls, ties, all subbase compacted below accordingly, footings dug out and laid etc. He built these walls according to what type of bond I am not sure. There were...

Builders vs. Brickies.....Theoretically, I have heard it argued today that there is no real need to consider having a continuous blockwork bond above and below DPC? Since a house virtually 'sits on itself' on top of DPC (it could effectively slide off in one go. but unlikely). I would ask for...