we live in an old house built around 1930 so it has not got a cavity as such just a gap of around 12 to 15mm between the outside brick work and the inside brick work and we have a damp problem i have brought some dryzone dpc cream to inject a new damp course and take the plaster off to the brick to around the 1000mm and treat the brick work with some kind of chemical to stop any salt coming through the bricks then was gong to apply a sand and cement render with a water proofer but on taking the skirting board off the concrete slab is around the same height as the mortar line i need to inject or a little higher so injecting to the next course will make the new dpc 100mm higher than it should be which will cause damp at skirting height would it be possible to apply a liquid dpm to the brick work from the floor level to the 1000mm and inject at one brick higher than it should be, im not a complete novice as im a joiner but not really clued up on damp problems any help would be much appreciated
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