Why Spray Application?

Sheet membranes and tapes fail at the joints — spray-applied liquid membranes don’t have any. One operative can cover up to 300m² per day, forming a single seamless, monolithic layer over any substrate.

  • Speed: whole plots sealed in a day, not a week
  • Seamless: no laps, no tapes, no weak points — the membrane follows every junction and penetration
  • Any substrate: OSB, blockwork, concrete, brick and complex hybrid builds
  • Certified: Passivhaus-certified and BBA-approved systems
  • Lower labour cost: fewer people, fewer hours, fewer callbacks

Built for every job

  • Installer applying Passive Purple liquid-applied airtight membrane with an airless sprayer onto OSB and timber frame walls, creating a continuous Passivhaus-standard air barrier for energy-efficient building envelopes.

    New build & timber frame

    Passive Purple spray-applied straight onto OSB and timber frame — the airtight layer is on and curing before the plasterboard arrives.

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    Large envelopes, fast

    A complete modular hospital envelope spray-sealed to an airtightness score of 0.2 ACH — Passivhaus-level performance at building scale.

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    Retrofit & re-cladding

    Spray grades handle high-rise re-cladding and whole-street retrofits where taping every junction simply isn’t viable.

Watch How Fast the Spray System Works

Graco TexSpray Mark IV airless spraying machine with high-pressure hose and gun, used for applying professional liquid coatings such as airtight membranes and waterproof systems

The kit is simple

A professional airless rig — like the Graco TexSpray range — the right nozzle, and standard PPE. That’s it. Brush and roller grades cover detailing, reveals and small areas, so one system handles the whole envelope.

Check exact coverage rates and application specs for every product before you price a job.

Application & coverage rates

Easy enough for Grand Designs

Kevin McCloud spray-applying Passive Purple on the Grand Designs North Cotswolds Passivhaus Premium self-build. If it can be picked up on camera in an afternoon, your crew will fly with it — and our team trains every installer who wants it.

Installer training & support