Multi-use sealant PASSIVHAUS BRICKSEAL

for building

Overview
Passivhaus Brickseal – breathable, invisible water protection for brick and masonry that improves thermal performance and provides long-term weatherproofing for 20+ years.

Key benefits

• Invisible protection – dries clear and preserves the natural appearance of masonry
• Breathable – maintains vapour permeability to avoid trapped moisture
• Energy saving – dry walls retain heat better, reducing heat loss
• Durable – long-term protection (20+ years)
• Versatile – suitable for brick, sandstone, concrete paving and mortar

Product description
Passivhaus Brickseal is a cream-based breathable masonry water repellent that penetrates into brick, sandstone, concrete and mortar and cures within the substrate. Unlike surface coatings, it provides weather protection without altering wall appearance while allowing vapour to pass through. Keeping masonry dry improves thermal efficiency and reduces damp-related deterioration, making Brickseal appropriate for new build, retrofit and heritage projects.

Related content

• Damp Walls? Two Breathable Solutions That Actually Work (guide)
• What Causes Damp Walls and What is the Solution? (guide)
• Rising Damp vs Penetrating Damp vs Condensation (guide)

Installation notes
Apply by brush, roller or airless spray. Coverage depends on substrate porosity; typical coverage approx. 4 m² per kg. Not suitable for painted, damp or pre-sealed surfaces. Installation checklists and technical guidance are provided with product documentation for QA and correct application.

Technical specifications

• Product type: Cream-based breathable masonry water repellent
• Finish: Invisible, dries clear
• Suitable for: Brick (including Fletton), sandstone, 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 absorbency)
• Durability: 20+ years
• Breathability: Fully vapour-open
• Ideal use: New builds, retrofits, heritage buildings, energy upgrades
• Sizes available online: 3.2 kg (3.76 L), 6 kg (7.06 L); 20 kg (23.53 L) on request
• Typical substrates: Fletton brick, West Hoathley brick, mortar, Blaxter/York/Sheffield sandstone, concrete paving