First off we shall start with the old "QCon" Blocks, these are now down to a measely 25baht each so the building cost is on par with using crappy red bricks, ie each one you lay is equivelant to quite a few bricks ( no I am not going to work out how many bricks) also you use only 3 mm of mortar so they set off real quick and they are also nice and square which makes it easy to build a straight wall, anyway can you tell me where the builders went wrong on this job?