Schlegel Aquamac 124 Qlon QL3020 Timber Weatherseal - 25m Pack

Schlegel Aquamac 124 (Qlon QL3020) Timber Door & Window Weatherseal – Kerf Fit Foam Gasket

The industry-standard kerf-fit weatherseal trusted by joiners and DIYers alike — no fixings, no fuss, outstanding performance for decades.

Schlegel Aquamac 124 (also referenced as Qlon QL3020 or AQ124) is one of the most widely specified polyurethane foam weatherseals in the UK joinery trade. Engineered to press-fit directly into a standard kerf slot with no adhesives, fixings, or specialist tools required, it delivers an immediate, professional-grade seal against draughts, water ingress, and heat loss, the moment it's installed. Whether you're refurbishing an ageing timber front door, restoring sash windows, or upgrading casement frames, Aquamac 124 restores a tight, energy-efficient seal in minutes.

Manufactured by Schlegel — now part of the ERA family, with nearly 50 years of weatherseal expertise, every metre of Aquamac 124 is built around a polyurethane (PU) foam core encased in a polyethylene (PE) film, with an internal glass fibre or polypropylene insert that prevents stretching or shrinkage. The result is a seal that conforms to BS644 and holds BBA approval, with independent testing under EN 12365:2003 confirming it retains its sealing performance after 10,000 opening and closing cycles, long after competing materials have begun to fail. Available in Black, White, and Brown to match your timber finish.

Key Benefits:

• Tool-Free Kerf Installation – Simply press the rigid foot into a 2.7–3.0mm wide kerf slot to depth. No adhesives, screws, or specialist equipment needed — most door or window frames can be sealed in under an hour.
• Excellent Memory & Shape Retention – The PU foam core returns to its original shape after repeated compression, maintaining a consistent seal year after year. Independent testing confirms performance after 10,000 open/close cycles.
• Exceptional Draught & Thermal Insulation – Seals gaps between 3.5mm and 7.5mm, closing the air paths responsible for heat loss and cold draughts — reducing energy bills and improving comfort throughout winter.
• Outstanding Acoustic Performance – Q-Lon's foam construction provides excellent sound attenuation, reducing external noise transmission through door and window frames.
• Impervious to Paint & Stain – Properties are completely unaffected by standard wood paints and stains, so you can redecorate without removing or replacing the seal — saving time and materials on every future decoration cycle.
• UV, Ozone & Weather Resistant – The polyethylene film cladding is UV-stabilised and immune to ozone degradation, ensuring the seal doesn't crack, harden, or discolour outdoors over time.
• Will Not Freeze to Mating Surfaces – The water-repellent foam construction prevents the seal from bonding to the opposing surface in frost conditions — doors and windows open freely even in sub-zero temperatures.
• Rot, Mould & Mildew Resistant – Unlike rubber or felt alternatives, Aquamac 124 will not deteriorate from moisture exposure, making it ideal for external applications in the UK's wet climate.
• Compensates for Frame Movement – The hinged, compressible profile accommodates seasonal timber movement and minor misalignment of the sash or door leaf, maintaining a consistent seal even as frames shift over time.
• BBA Approved & BS644 Compliant – Tested and approved to British Standards, making it the specification-safe choice for renovation projects, period properties, and any work where compliance documentation matters.

Product Specifications:

• Brand: Schlegel (ERA Group)
• Product Name: Aquamac 124 (AQ124)
• Also Known As: Qlon QL3020 / Schlegel QL3020
• Roll Length: 25 Metres
• Seal Material: Polyurethane (PU) foam core with polyethylene (PE) film cladding
• Internal Reinforcement: Glass fibre thread or polypropylene (PP) insert — prevents elongation and shrinkage
• Seal Operation: Hinged / compressible
• Application: Entry doors, windows — timber frames with kerf slots
• Fitting Method: Kerf slot (press-fit — no fixings required)
• Rebate Depth: 13.00mm
• Groove Width: 2.70mm minimum / 3.00mm maximum
• Groove Depth: 7.00mm
• Sealing Gap Range: 3.5mm minimum / 7.5mm maximum
• Available Colours: Black, White, Brown
• Compliance: BS644, BBA Approved, EN 12365:2003

Please measure your existing kerf slot carefully before ordering. Groove width must be between 2.70mm and 3.00mm and groove depth a minimum of 7.00mm to accept Aquamac 124. If your kerf dimensions differ, please contact us — alternative Aquamac profiles may be more suitable.

Pro Tips:

Pro Tip: Before installing, clean out the kerf slot with a dry brush to remove any sawdust, old sealant residue, or paint build-up. A clear, debris-free groove ensures the rigid foot seats fully to depth, giving you the correct seal compression from the outset. When cutting Aquamac 124 to length, use sharp scissors or a craft knife — a clean, square cut at each corner prevents gaps at the mitres. For best results on door frames, start at the top of the frame and work down each side, cutting mitres at 45° for neat, draught-free corners.

Package Contents:

• 1 × Aquamac 124 (Qlon QL3020) Weatherseal Coil (25 Metres)

No fixings or adhesives are required or included. The seal is self-retaining in a correctly sized kerf slot.

Frequently Asked Questions:

Is Aquamac AQ 124 suitable for uPVC doors and windows as well as timber?
Aquamac 124 is primarily designed and specified for timber frames where a 2.7–3.0mm kerf slot can be machined or already exists. Some manufacturers have used it in uPVC applications, but it is most commonly associated with timber joinery. If you have a uPVC frame, please check the kerf dimensions match the specification above, or contact us — there may be a more suitable profile available.

Can I paint over the seal after installation?
Yes. One of Aquamac 124's key advantages is that it is fully impervious to standard wood paints and stains. You can redecorate the surrounding timber without removing the seal, and the paint will not bond to or damage the polyethylene film surface. This makes it particularly practical for period properties where regular repainting is part of ongoing maintenance.

My door has gaps of around 5–6mm — will this seal work?
Yes. Aquamac 124 is designed to compress and seal gaps between 3.5mm and 7.5mm, so a 5–6mm gap falls comfortably within its operating range. The hinged PU foam profile compresses under door or window closure and springs back reliably when opened, maintaining consistent draught exclusion throughout the range.

How long will Aquamac 124 last in service?
Schlegel's independent testing under EN 12365:2003 demonstrates that Q-Lon seals maintain their sealing properties after 10,000 cycles of opening and closing — a level at which many competing seal materials fail to meet standard operational requirements.

What length do I need to seal a standard front door?
A standard single timber door frame (two vertical sides plus a head) typically requires approximately 5–6 metres of seal. We recommend measuring your frame perimeter accurately and adding 10–15% for wastage at the corners. For a full refurbishment of a door and multiple windows, our longer coil lengths offer significantly better value per metre.

Why Choose Schlegel Aquamac 124?

When a weatherseal has been the go-to specification for timber joiners and heritage window restorers for nearly five decades, it's not by accident. Schlegel's Q-Lon technology — the foundation of every Aquamac 124 seal — was developed through continuous research and strict material quality inspection, resulting in a product that consistently outperforms felt, rubber, and standard foam alternatives in thermal insulation, acoustic attenuation, weather resistance, and long-term shape retention. Independent testing confirms what the trade has known for generations: when you press Aquamac 124 into a kerf slot, you're fitting a seal that will still be performing correctly long after cheaper alternatives have compressed, cracked, or crumbled. Backed by a lifetime guarantee and BBA approval, this is the professional's choice — now available to every homeowner serious about keeping the cold out and the warmth in.