masonry wall protection paint to protect buildings from getting damp
Side-by-side comparison of untreated bricks and bricks protected with Passivhaus Brickseal, showing no change in appearance but complete moisture protection.
masonry brick sealant to stop mold and damp
Hand applying Passivhaus Brickseal invisible coating to a brick wall to stop damp and moisture penetration.
Exterior brick wall coated with Passivhaus Brickseal, providing long-lasting, breathable protection against rain, damp, and frost damage.

Weatherproof Masonry Damp Proof Paint

Enquire Now BelowFrom £45.00 + VAT

Product Collection: Passivhaus Brickseal
Applied By: Brush, Roller or Spray
Size Available to Buy Online: 3.2kg (3.76 litres), 6kg (7.06 litres)
Size Available on Request: 20kg (23.53 litres)
Substraints Used On: Brick Fletton, Brick West Hoathley, Mortar, Sandstone Blaxter, Sandstone York, Sandstone Sheffield, Concrete Paving

Sample Available Here

Passivhaus Brickseal – Invisible Protection for Brick and Masonry with Superior Airtightness

Passivhaus Brickseal from Intelligent Membranes is an advanced liquid-applied sealing solution, specifically designed for brick and masonry surfaces. Passivhaus Brickseal delivers invisible protection, creating a weather barrier which prevents moisture from penetrating your walls. Engineered to meet Passivhaus standards, it is perfect for new builds and retrofit projects where both energy efficiency and protection from damp are critical.

Key Features and Benefits:

  • Invisible and Seamless Finish: Once applied, Passivhaus Brickseal dries clear, ensuring that the aesthetic appearance of your brick or masonry is not altered. This makes it an ideal choice for protecting heritage or visually sensitive buildings.
  • Stops Damp Penetration: Designed to stop damp from seeping through walls, Passivhaus Brickseal forms a water-repellent barrier on masonry surfaces, protecting against moisture infiltration and reducing the risk of damp-related damage over time.
  • Brush or Roller Application: Easy to apply using a brush or roller, Passivhaus Brickseal provides full coverage and seamless protection, allowing for a quick and efficient application process on both new and existing structures.
  • Long-Lasting Protection: Once applied, Passivhaus Brickseal forms a tough, durable barrier that protects brick and masonry from the elements, preventing moisture damage and weathering while maintaining airtightness for years to come.
  • Preserves Building Appearance: The invisible finish ensures that the look and feel of your brickwork or masonry is not compromised, maintaining the building’s original aesthetic.

PassivHaus brick sealer masonry protection paste is a deeply penetrating water-repellent paste for the protection of masonry. The thick, white paste is ready to use and can be applied by brush, roller, or airless spray. It penetrates into the brickwork, masonry, mortar, and concrete, where it will cure to a colourless, natural finish, lasting for a minimum of 15 years. Passivhaus Brickseal paste can help improve the energy efficiency of dwellings by reducing heat loss.

Consumption 4m2 per kg.

Passivhaus Brickseal can not be applied to damp or wet surfaces.

Passivhaus Brickseal can not be applied to any pre-paint surfaces.

Organic material must be removed and treated with a biocide prior to the application of Passivhaus Brickseal.

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What is Passivhaus Brickseal?
  • Key Details

    Key Details – Passivhaus Brickseal

    • Product Type: Cream-based breathable masonry water repellent

    • Finish: Invisible, dries clear – no change to wall appearance

    • Suitable For: Brick, sandstone, Fletton brick, concrete paving, mortar

    • Not Suitable For: Painted, damp, or pre-sealed surfaces

    • Application: Brush, roller, or airless spray

    • Coverage: Approx. 4 m² per kg (varies with surface absorbency)

    • Performance: Improves thermal efficiency by keeping walls dry

    • Durability: 20+ years of long-term protection

    • Ideal Use: New builds, retrofits, heritage buildings, and energy upgrades

    • Breathability: Fully vapour-open – prevents trapped moisture

  • Description

    Passivhaus Brickseal – Breathable Masonry Water Repellent

    “Invisible, breathable water protection for brick and masonry – improve energy efficiency and safeguard your walls for over 20 years.”

    Passivhaus Brickseal is a high-performance, cream-based water-repellent treatment for masonry. Designed to protect brick, concrete, sandstone, and mortar, it penetrates deep into the substrate, creating an invisible barrier against driving rain and moisture while allowing the wall to remain fully breathable.

    Unlike paints or surface coatings, Brickseal cures within the masonry itself, ensuring long-term weather protection without altering the natural look of your walls.

    By keeping walls dry, Brickseal helps improve thermal efficiency, reduces heat loss, and protects buildings from damp-related damage — making it an ideal solution for retrofit upgrades, heritage properties, and new-build projects alike.

    Key Benefits:

    • ✅ Invisible protection – dries clear, preserving natural brickwork appearance

    • ✅ Breathable – maintains vapour permeability to prevent trapped moisture

    • ✅ Energy saving – dry walls retain heat better, reducing energy loss

    • ✅ Durable – long-lasting protection for 20+ years

    • ✅ Versatile – suitable for brick, sandstone, concrete, paving, and mortar

    Passivhaus Brickseal is the smart choice for anyone looking to protect masonry from the elements, enhance building performance, and extend the life of their property — whether it’s a modern home, a retrofit project, or a listed building.

    Additional information

    Weight 3.2 kg
    Tub Size

    3.2kg, 6kg
  • Data Sheets & Certificates
    Technical Data Sheet
    Safety Data Sheet
    Install Guide
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  • Delivery

    All delivery charges are included in the price of the products and are dependent on the products selected for purchase. This charge is based on delivery to mainland UK, excluding the Scottish Highlands & the Islands where additional shipping charges will apply. For more information read our delivery policy in full.

    Intelligent Membranes do not offer a next day delivery service.

    Intelligent Membranes aim for deliveries to be with the customer within 2 working days. During the festive period deliveries could take longer.

    Orders placed before 12pm will be dispatched the same day, any orders placed after 12pm will be dispatched the following working day

  • Returns

    We, at Intelligent Membranes, would like you to be 100% satisfied with your purchase and our service. In the unfortunate event of any item being unsuitable or wrong, please read our returns policy in full.

Frequently Asked Questions (FAQ) – Passivhaus Brickseal

1. Can Passivhaus Brickseal be applied to all types of masonry surfaces?

Yes. Passivhaus Brickseal is suitable for a wide range of masonry, including brick, sandstone, Fletton brick, concrete paving, and mortar joints. It should not be applied to damp, painted, or previously sealed surfaces.

2. Will Brickseal change the look of my brickwork?

No. Brickseal dries to an invisible, clear finish that preserves the natural character of your brickwork while providing high-performance water repellency.

3. How do you apply Passivhaus Brickseal?

Simply apply with a brush, roller, or airless spray. The cream penetrates deeply into the substrate, cures within the wall, and creates long-lasting, invisible weather protection.

4. Does Brickseal improve energy efficiency?

Yes. By reducing moisture absorption in masonry, Brickseal helps prevent walls from staying cold and damp. Dry walls hold heat better, improving thermal efficiency and creating a warmer, healthier living environment.

5. Is Brickseal suitable for both new builds and older properties?

Absolutely. Brickseal is ideal for heritage buildings, retrofits, and renovations where breathability must be maintained, as well as new-build projects requiring long-term weather protection.

6. What preparation is required before use?

Surfaces must be clean, dry, and free from dirt, moss, algae, or organic growth. Where necessary, use a biocide to treat masonry beforehand. Do not apply to wet masonry, painted surfaces, or walls with existing sealants.

7. What coverage rate should I expect?

Coverage averages 4 m² per kg, but this will vary depending on masonry absorbency and surface roughness.

8. How long does Passivhaus Brickseal last?

Brickseal provides over 20 years of protection against water ingress while maintaining the natural breathability of the wall — offering reliable, long-term performance.

👉 Passivhaus Brickseal is the go-to solution for invisible, breathable water repellency — perfect for new-build construction, retrofits, and protecting historic masonry.

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