Barbican BB025 Professional Masonry Water Repellent

Stop penetrating damp. Keep your home warmer, drier, and protected.

    • Damp walls don’t just look bad — they waste energy, damage your home, and make it harder to stay warm.
    Barbican BB025 Professional Masonry Water Repellent is the invisible shield that stops penetrating damp at its source. With up to 10 years of protection, it keeps your walls dry, your home warmer, and your maintenance bills lower.

    Penetrating damp can be caused by:
    -Leaking roofs or damaged flashings
    -Cracks and gaps in external walls
    -Blocked gutters and downpipes
    -Poor construction
    -Porous building materials

    • If all other causes are ruled out, porous masonry is usually the culprit. Over time, bricks and mortar deteriorate and the start absorb water through tiny cracks and channels. This moisture travels through the wall by capillary action, showing up indoors as damp patches, bubbling wallpaper, or mould.

    The Barbican BB025 Solution

    BB025 works by lining those microscopic channels with a hydrophobic (water‑repelling) barrier. Water can no longer travel through the wall, but vapour can still escape — so your home stays dry and breathable. Because the barrier forms inside the masonry itself, it’s:

    Because the water repellent barrier forms inside, and becomes part of the masonry it’s

    • Invisible
      • no change to colour or texture
    • Durable
      • Extremely resistant to UV and weathering
    • Effective
      • Barrier is deep within the masonry and starts protecting in just 24 hours, full protection in 7 – 20 days

    Protects your home

    • Up to 10 years of proven protection
    • Stops water travelling through porous masonry
    • prevents damp patches, mould and peeling wall paper

    Saves energy and money

    • Keeps walls dry so your home stays warmer
    • Reduces heating costs by preserving insulation performance

    Preserves appearance

    • Invisible finish – no change to colour or texture
    • Prevents white salt staining (efflorescence)
    • Stop frost damage and surface crumbling (spalding)

    Safe and easy to use

    • No VOC’s, water-based, easy clean-up
    • Apply with brush, roller, or spray
    • Concentrated formula = less packaging

    How to apply Barbican BB025 professional masonry water repellent
    Barbican BB025 professional masonry repellent must not be used un-diluted

    1. Dilute: For general use mix 1 part Barbican BB025 professional masonry water repellent with 9 parts clean water (trial pots available to test ratios).
    2. Prepare: Fill cracks, remove loose material and greenery, brush clean.
    3. Apply: Work top to bottom in sections. Apply 3 coats while surfaces remain damp.
    4. Conditions: Avoid rain and extreme temperatures (below 5°C or above 30°C) while applying.
    5. Finish: Clean tools with water. Protection begins in 24 hours.

    Why Choose BB025?

    Unlike surface coatings that peel or trap moisture, BB025 penetrates deep into the masonry, creating a long‑lasting, breathable barrier. The result: a warmer, healthier, more energy‑efficient home.

    ✅ Protect your home for the next decade.

    Order your trial pot today and see the difference in just 24 hours.