Passivhaus Brickseal – Clear waterproofing for new and old Masonry builds - Single Coat Masonry Protection System

Product Application – PassiveHaus Brick Seal

General

Apply in accordance with manufacturer’s written instructions.

PassiveHaus Brick Seal shall be applied to external masonry to provide a breathable, water-repellent barrier while maintaining vapour permeability and the natural appearance of the substrate.

Suitable Substrates

• Clay brick
• Facing brickwork
• Mortar joints
• Sandstone and natural stone
• Concrete block
• Masonry façades

Substrates must be mineral, absorbent and suitable for penetration treatment.

Substrate Preparation

Substrates shall be:

• Clean and dry
• Free from dust, dirt, efflorescence and biological growth
• Free from surface coatings, sealers or contaminants that may inhibit penetration
• Structurally sound and fully cured

Cracked or defective mortar joints should be repaired prior to application.

Environmental Conditions

• Minimum application temperature: +5°C and rising
• Do not apply during rainfall or where rain is forecast before curing
• Avoid application to frozen substrates
• Protect adjacent glazing and surfaces from overspray or contact

Application Method

• Ready to use – do not dilute
• Apply evenly by brush, roller or low-pressure spray
• Ensure full saturation of the masonry surface
• Work from the bottom upwards to avoid streaking
• Avoid ponding or excessive surface build-up

One coat is generally sufficient due to deep penetration technology.

Curing and Performance

The product penetrates into the masonry substrate where it reacts to form a durable, invisible hydrophobic barrier.

Once cured, the treated surface shall:

• Repel driving rain
• Remain vapour permeable
• Maintain original surface appearance
• Reduce water absorption and moisture-related deterioration

Coverage

Coverage rates will vary depending on substrate porosity and profile.

Apply sufficient material to ensure full penetration and effective water repellency.