Damp proofing in Liverpool: Rising Damp Treated on Two Walls in 2 Days

The problem

The homeowner had damp low down on two ground floor walls. Our surveyor visited on 7 October 2026 and found rising damp in the back wall and the gable wall, with a failed or missing damp-proof course and ground salts in the plaster up to about 1 metre.

Plaster full of ground salts keeps pulling moisture out of the air, so it has to come off rather than be dried out. There was also an old round core hole in the outside wall, stuffed with expanding foam, that needed filling properly.

What we did

1. Free survey: confirmed rising damp in the two walls and agreed a written specification and fixed price.
2. Laid floor protection, took the skirting off both walls and removed the socket back boxes in the treatment area.
3. Stripped the plaster from both walls back to brick to 1 metre, about 10m², and took it away.
4. Applied Permagard salt neutraliser across the full stripped area.
5. Drilled the mortar bed along both walls, including the internal corner, and injected Permagard damp-proofing cream to form a continuous chemical damp-proof course, about 10 linear metres.
6. Fixed Permagard 3mm mesh membrane over the stripped area with sealed plugs, taping the joints and sealing the corners and floor line.
7. Replastered with renovating plaster and a multi-finish skim, with angle and stop beads, and refitted the back boxes flush where the cables had slack.
8. Outside, cut back the foam, filled the old core hole solid with sand and cement, pointed it flush and touched it up to match, leaving the existing air brick open.

The result

Both walls now have a new chemical damp-proof course and a membrane behind fresh plaster, finished flush with the existing walls and ready to decorate once the plaster has dried, usually 4 to 6 weeks.

The job was done in 2 days, 29 and 30 October 2026. The homeowner has a completion certificate with before, during and after photos and a 25-year guarantee, insurance-backed by GPI.

What the customer said

• “A minor problem was dealt with quickly and professionally.”

  “Job in Liverpool. Pleased with outcome. A minor problem was dealt with quickly and professionally. Would recommend.”

  John, Liverpool 5/5Google review · Nov 2026