IM Fleece Airtightness Tape for Windows & Junctions

£40.00 GBP

excl. VAT

IM Fleece Airtightness Tape connects window and door frames, board joints and building junctions to the surrounding air barrier. Its self-adhesive backing and plasterable fleece face help create a neat, continuous seal in new-build and retrofit construction.

Choose a 25m roll in 75mm, 100mm, 150mm or 200mm width, with single-roll and box options available above. Select the width to suit the junction, the required bonded area on each surface and the movement allowance in your project detail.

Choose tape for the detail

Windows and doors: connect the frame to the designed airtight layer around the reveal.
Board and membrane joints: use where the substrate and adjoining membrane are confirmed as compatible.
Retrofit junctions: bridge changes of material after making the surfaces sound and preparing a suitable bonding area.
Plastered finishes: the fleece face accepts compatible plaster or paint as specified in the installation detail.

The tape has a modified polyamide film and nonwoven fleece construction with moisture-dependent vapour resistance. Airtightness and vapour control are different requirements: confirm the complete wall or roof build-up when selecting the tape and adjoining membrane.

Prepare and apply correctly

Use sound, dry surfaces free from dust, grease and loose material. Check adhesion on the actual substrate and use a suitable primer where required.
Apply between +5°C and +40°C. Do not bond to wet or damp surfaces.
Peel back the release liner progressively, leave the required movement allowance and press the bonded area firmly with a roller.
Overlap tape joins by at least 50mm and inspect corners and ends for open paths.
Connect the tape into the adjoining air barrier using the specified compatible detail. Inspect before covering and protect exposed tape within the stated 12-month UV limit.

These are selection notes, not a substitute for the IM Fleece Tape technical data sheet and installation guide. Ask our technical team to confirm primer, substrate and membrane compatibility for your junction.

Part of a complete airtight system

Use the tape at suitable linear junctions and Passive Purple liquid airtight membrane across the specified surrounding surface. Follow the approved interface detail, coating coverage and curing instructions. Choosing a tape alone does not guarantee a whole-building air-test result or establish a radon-resistant detail.

Find the right guide

Ready to order? Select your width and pack size above. For an unusual junction, contact our technical team before installation.

Details
Data Sheets
FAQ

Moisture-dependent SD value
Suitable for retrofit and new construction
For compatible prepared window frames, masonry and other substrates identified in the technical guidance
Application temperature +5°C to +40°C; compatible plaster or paint finishes
Stretchable
Service-temperature resistance -40°C to +80°C (not the application range)
Shelf life 24 months, dry at room temperature and in the original packaging
Weight – approx. 350 g/m²
Thickness – approx. 0.55 mm
Fire performance – Class E, MPA*
UV stability 12 months, MPA
View our technical data sheet for more details

IM Fleece Tape - Technical Data Sheet (TDS)

IM Fleece Tape - Install Guide

IM Fleece Tape - Safety Data Sheet (SDS)

3D Detail Drawings - Booklet Set One

3D Detail Drawings - Booklet Set Two

3D Detail Drawings - Booklet Set Three

All 3D Detail Drawings

Can I plaster or paint over it? The fleece face accepts compatible finishes. Confirm the finishing sequence and ensure the tape is fully bonded first.

Can I apply it to damp masonry? No. Use sound, clean, dry surfaces and a suitable primer where required. Apply within +5°C to +40°C.

What overlap should I use? The IM data sheet requires at least 50mm at tape-to-tape joins. Follow the project detail for frame and substrate bonding areas.

Is it automatically suitable for radon barriers? No. Airtightness does not establish radon-system suitability; require documented compatibility and an approved complete detail.

Why choose IM Fleece Airtightness Tape?

Use the self-adhesive tape to connect prepared window frames and compatible building junctions to the air barrier. The fleece face accepts compatible plaster or paint, and the modified polyamide layer has moisture-dependent vapour resistance. Sd describes equivalent air-layer thickness for vapour diffusion. Follow the specified substrate preparation, movement allowance and finishing detail; whole-building airtightness depends on the complete envelope and its installation.

Shipping & returns summary

We, at Intelligent Membranes, would like you to be 100% satisfied with your purchase and our service. In the unfortunate event of any item being unsuitable or wrong, please read the following for advice on returning goods to us.

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For architects and specifiers

How to specify this product

The NBS clauses and Uniclass codes this product is specified under, with clause wording you can paste straight into your specification.

NBS clauses

L10/75Sealant joints
L10/810Sealant joints
P10/60Air and vapour control layer

Uniclass 2015

Pr_30_31_76_16Construction joint sealants

View on NBS Source Get specification support

Clause wording

SEALANT JOINTS – AIRTIGHT TAPE TO WINDOW AND DOOR PERIMETERS
Manufacturer: Intelligent Membranes Ltd, Cambridge. Tel 01223 208174. intelligentmembranes.com
Product reference: IM Fleece airtightness tape, fleece-backed.
Use: Airtight seal between window and door frames and the structural opening, and at junctions and penetrations.
Substrates: Bonds to timber, brick, concrete and membranes.
Finishing: Plasterable and paintable.
Service temperature: −40 °C to +80 °C.
Interface: Overcoated with Passive Purple / Airtight White where the tape meets the liquid airtight layer.
Installation: In accordance with the manufacturer's current technical data sheet and installation guide.

Check against the current technical data sheet before issue. Certificates are in the Downloads tab.

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