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Injection Damp Proofing.

Injection damp prevention is a common and effective method used to stop rising damp in masonry walls. It involves creating a chemical damp-proof course (DPC) by injecting a water-repellent substance into the wall.

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​Rising damp occurs when moisture from the ground travels upward through porous materials like brick or mortar. If there’s no proper DPC, or if the original one has failed, injection damp prevention is used to create a new barrier that blocks capillary movement of water.

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4 Step Process

  • Assessment:
    The wall is inspected to identify the extent of damp and ensure the problem is not due to other causes (like leaks or condensation).

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  • Drilling:
    Small holes (usually 10–12 mm in diameter) are drilled horizontally along the mortar joint at a uniform height—typically 150 mm above ground level, spaced about 100–120 mm apart.

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  • Injection:
    A silane/siloxane-based cream or liquid is injected into the holes using a special gun or pump.

    • The cream gradually diffuses into the surrounding masonry.

    • The chemical reacts with the moisture and minerals in the wall, lining the pores with a water-repellent layer.

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  • Sealing:
    Once injected, the holes are sealed with mortar, and any damaged or salt-contaminated plaster is replaced with a damp-resistant render.

Barrier Protection.

When a silane/siloxane cream or similar chemical is injected into a wall, it diffuses through the masonry pores and capillaries. Inside the wall, the active ingredients react with silica and moisture to form a hydrophobic (water-repelling) layer on the internal surfaces of each pore.

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Think of it as lining the microscopic pathways that water would normally travel up through — but instead of sealing them shut (which could trap moisture), the treatment coats them with a repellent film.

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So, water can’t rise up through capillary action anymore, but the wall can still “breathe” — allowing water vapour to escape. This is crucial for long-term success.

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  1. Stops Rising Damp at Its Source
    Moisture from the ground can no longer rise above the new chemical damp-proof course, because the treated zone breaks the capillary chain.

  2. Prevents Salt Migration
    Groundwater often carries nitrates and chlorides (“salts”) that crystallize in plaster and damage finishes. By halting the upward movement of moisture, the injection also stops these salts from reaching higher parts of the wall.

  3. Allows Wall Drying
    Once the source of moisture is stopped, the existing dampness in the wall slowly evaporates. Over time (often several months), the wall becomes progressively drier.

  4. Compatible Plastering Ensures Longevity
    After treatment, damaged plaster must be replaced with a breathable renovating plaster or lime-based render. This ensures that any residual moisture can escape rather than being trapped — which helps the system last indefinitely.

  5. Chemical Stability
    Modern silane/siloxane creams are designed to remain stable and effective for decades — most manufacturers guarantee 20–30 years of performance when installed correctly.

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