Salt brought up by rising damp. Any one who say rising damp doesn't exist LOOK !
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The entrance hall floor had soaked up damp over 100 years as the in fill for the solid floor was slag and ash from a local iron works when the house was built. The worse affected walls all bordered on to the solid hallway floor.
Unfortunately the original Victorian Minton tiles had to be lifted. I saved as many as I could but quite a few got broken in the process.
We dug down 10 inches to remove the ash and slag. Then put a concrete footing in for the staircase on which we built a support wall consisting of engineering bricks (which included a physical damp proof course). The staircase had lifted 1/2 an inch as the sub floor infill had
swollen over years, it relaxed back when we dug out the floor but will
always be out of true somewhat. We removed the plaster to a height of
one meter on all walls
All the walls were drilled and injected with Dryzone Cream according to manufacturers requirements.
The solid floor removal, plaster removal and damp proofing has been hard but satisfying work.
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