Why IM Fleece Airtight Tape is the Installer’s Secret Weapon for Airtightness

When it comes to creating airtight, smoke-tight, and energy-efficient buildings, every detail matters. Joints, corners, service penetrations, and window junctions are the weak spots where most air leakage happens. That’s why IM Fleece Airtight Tape is a game-changer for installers, architects, and retrofit specialists.

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Why Airtight Tapes?

Even the best membranes and plasters need reinforcement at key junctions. Airtight tapes ensure:

• Continuity of the airtight layer – no breaks, no leaks.
• Long-term adhesion – designed to last the life of the building.
• Passivhaus airtightness standards – helping projects achieve <0.6 ACH in air tests.

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Why Fleece?

The fleece backing is what sets IM Fleece Airtight Tape apart:

✅ Plasterable Surface – the fleece face can be plastered, skimmed, or painted over, making the tape completely invisible once the build is finished.

✅ Vapour Open, Airtight Performance – fleece allows controlled vapour diffusion while maintaining a fully airtight seal.

✅ Flexible Detailing – the soft fleece backing means it easily adapts to irregular substrates, corners, and junctions.

✅ Perfect Bond with Substrates – the fleece fibres lock into plaster or paint, ensuring a permanent airtight connection.

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Where Do We Use IM Fleece Airtight Tape?

• Window & Door Frames – sealing junctions between frame and masonry.
• Floor-to-Wall Junctions – covering the critical edge where leakage usually occurs.
• Service Penetrations – pipes, cables, and ducts are sealed airtight but remain accessible.
• Retrofit Projects – works perfectly with old blockwork, concrete, and plaster.

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Installation Made Simple

1. Prepare the surface (use IM Primer on dusty or porous masonry).
2. Cut the tape to length and apply with firm pressure.
3. Plaster or skim over the fleece face for an invisible finish.

The result? A seamless, airtight layer that disappears into the building fabric.

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The IM Advantage

Unlike standard airtight tapes, IM Fleece Airtight Tape is designed for both performance and practicality:

• Works internally and externally
• Compatible with Passive Purple for total airtight systems
• Designed to last the lifetime of the building
• Helps smash airtightness testing targets

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Conclusion

IM Fleece Airtight Tape is more than just tape — it’s the bridge between building fabric and airtightness strategy. By using fleece-backed tapes, installers ensure airtightness is not only achieved but permanently locked into the structure.

If you’re building or retrofitting to Passivhaus, EnerPHit, or Net Zero standards, IM Fleece Airtight Tape is the detail that makes the difference.