Weatherproofing solutions — Passive Purple External liquid weatherproof facade membrane, raintight and vapour open

Weatherproofing

Weatherproofing that’s airtight, breathable and fire-rated. A facade has to keep wind-driven rain out, let water vapour escape, and hold the airtight line — all at once, for decades. Our liquid-applied weatherproof membranes do all three in one coat.

The external weatherproofing system

  • Facades at scale — Passive Purple External: spray or roller applied, airtight, vapour-open and fire Class B — built for facades, re-cladding and high-rise remediation.
  • Detailing & junctions — brush-grade facade membrane for reveals, junctions and penetrations.
  • Exposed brickwork — Passivhaus brick sealer cream: invisible weatherproof masonry protection that stops penetrating damp without changing the look of the brick.
  • Windows & interfaces — IM Fleece Tape keeping the line continuous where materials meet.

Browse the full weatherproof membrane collection.

Install from the outside

On retrofit and re-cladding projects, working from the outside means residents stay in their homes while the envelope is upgraded — a game-changer for social housing and high-rise. Read how it works: airtight and vapour control for high-rise re-cladding, installed from the outside.

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