Whether you are building with Timber, Steel, Concrete,or Block—Passive Purple is the Passivhaus Certified liquid vapour control layer that guarantees performance without the headache of tape.
Old-fashioned paper membranes and tapes are fiddly, fragile, and prone to "site damage." Passive Purple changes the game.
No Joints: It dries into a single, seamless skin. No overlaps to tape means no weak points to leak.
Speed: One person can seal a whole house in a day using a sprayer or roller.
Durability: It is fused to your wall. It won’t peel off or tear when other trades come in.
Works on Any System
Passive Purple (Internal) is the industry’s most versatile airtightness layer. It adheres aggressively to almost any common building material, making it the perfect choice for:
Timber Frame
The classic self-build choice. Passive Purple seals the warm side of the insulation, protecting your timber from moisture and eliminating drafts through the frame.
LGS (Light Gauge Steel)
Steel frames can be tricky to tape. Passive Purple sprays directly onto the metal and boarding, moulding perfectly around profiles and screws for a guaranteed seal.
Masonry & Block
Forget about "wet plaster" layers just for airtightness. Apply Passive Purple directly to concrete blocks or brickwork to stop air leakage through the mortar joints and porous blocks.
ICF (Insulated Concrete Formwork)
ICF is great for insulation, but the joints still need sealing. Passive Purple bonds seamlessly to the polystyrene face, creating the final airtight skin your high-performance home needs.
The "Must-Have" Features
1. Passivhaus Certified
You don't just take our word for it. This product is certified by the Passivhaus Institute. It is proven to achieve 0.03 ACH (Air Changes per Hour), ensuring your home stays warm and your bills stay low.
2. Swimming Pool Ready
Building a home with a pool?
YES, Passive Purple is suitable for swimming pool environments.
The Critical Rule: To handle the extreme humidity of a pool hall, the membrane must be applied at the correct thickness. You must verify the wet film thickness during application to ensure performance. Always check the technical datasheet for the specific pool gauge requirements.
3. The Radon "Bonus"
We sell this as an airtight vapour control layer, but you get a major free upgrade. Passive Purple is also a Certified Radon Barrier. By sealing your floor-to-wall junctions, you are automatically protecting your family from ground gases.
"What if I have a Solid Wall or need Class B Fire Rating?"
You might need the upgrade.
While Standard Passive Purple covers 90% of new builds, some projects have unique demands.
If you are doing a Retrofit on an old solid-walled property (which needs to breathe), OR
If your building regulations demand a Class B Fire Rating (superior fire resistance).then you should check out Passive Purple X. It offers intelligent breathability and higher fire specs for complex projects. (Note: Passive Purple X is NOT suitable for swimming pools).
Ready to Build Tight?
Join thousands of self-builders using the purple paint to pass their air test first time.
