Where’s the job?

Overview

• Penetrating damp treatment involves injecting damp-proofing chemicals into masonry to form an internal barrier against rising damp.

• Skill level: 4 / 5 (requires accurate diagnosis, chemical handling and precise injection techniques).

• Typical duration: 1 – 2 days depending on the extent of damp and number of injection points.

Safety First

• Always wear protective clothing, gloves, goggles and a respirator when handling chemical treatments.

• Ensure the area is well ventilated to avoid inhaling chemical fumes.

• Secure the work area and cover furnishings to protect against chemical spills.

• Always follow manufacturer guidelines for mixing, injecting and curing of chemicals.

• Isolate any sensitive electronics or wiring nearby if chemical spillage is a risk.

Tools & Materials

1. Inspect the wall – assess the moisture levels and identify signs of rising damp.

2. Prepare the area – clear loose plaster, protect furnishings and mark injection points.

3. Drill holes – make evenly spaced holes in the wall to allow uniform chemical distribution.

4. Inject damp-proofing chemical – use the injection gun to deliver the treatment carefully into each hole.

5. Seal the holes – fill the drilled holes with an appropriate filler or sealant once treatment is applied.

6. Re-plaster & cure – repair the wall surface and allow sufficient time for the chemical to stabilise.

7. Re-test moisture levels – confirm that the damp has been arrested before finishing.

Completion Checks

• Wall moisture readings should be well below problem levels after treatment.

• No further signs of salt efflorescence or blistering plaster.

• Treated areas show a uniform finish with no re-emergence of damp.

• Final visual inspection confirms repair integrity and surface readiness.

When to Call a Pro Instead

If the building has extensive structural issues, severe mould growth, or prior damp treatments have failed, it is advisable to engage a certified damp-proofing specialist to ensure long-term protection and compliance with industry standards.