Retrofitting Airtightness At Scale Spray — Intelligent Membranes

Retrofitting Airtightness at Scale (Spray)

On larger retrofit projects — whole houses, blocks or social-housing programmes — sealing by brush alone is too slow. Spraying covers big areas fast while keeping walls breathable, so you get scale without sacrificing moisture safety.

Spraying airtightness at scale

The problem

Detailing every junction by hand doesn’t scale across large retrofit areas, but you still can’t afford to trap moisture in existing fabric. Retrofit frameworks like PAS 2035 require a moisture-safe approach, so the membrane has to be vapour-open as well as fast.

The solution: Passive Purple Retrofit (10kg Spray)

Passive Purple Retrofit (10kg) is a vapour-open airtight membrane that sprays across large areas quickly, sealing existing walls against air leakage while letting them breathe. Use the brush grade for the details and this for the open runs — one system, two application methods.

How it is applied

  • Prepare and prime the substrate as needed
  • Brush-detail junctions and penetrations first
  • Spray the open wall, floor and soffit areas
  • Pair with controlled ventilation

Benefits

  • Fast coverage on large retrofits
  • Vapour-open for existing walls
  • Internal or external use

Frequently asked questions

Internal or external? Both — it suits internal retrofit and external re-cladding works.

Does spraying need special kit? Yes — airless spray equipment; ask us for the spec.

New to airtightness? Read What Is Airtightness?

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