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Upgrading Ledge and Brace Doors

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Upgrading Ledge and Brace Doors

Before coating, ensure all surfaces are sound, clean, dry and free from dirt, grease, wax etc.

METHOD 1

If the boards of the door are at least 20mm thick and the thickness of the tongue & groove joints is more than 10mm, a Ledge and Braced door may be upgraded to 30 minutes fire protection with either:

  • Clear Finish – Apply 2 coats of HW02 Clear Intumescent Coating at 8 m2 per litre, per coat and 1 coat of WBI Clear Protective Topcoat (matt, satin or gloss) at 10 m2 per litre to both sides of the door.

  • Painted Finish – Apply 2 coats of HW01 Intumescent Paint at 8 m2 per litre, per coat and 1 or 2 coats of WBI Protective Topcoat (matt, satin or gloss) at 10 m2 per litre, per coat to both sides of the door. White or chosen colour.

If the door has been previously coated, 1 coat of HW/AP Adhesion Primer should be used prior to the application of HW01 or HW02.

Ensure that HW01 or HW02 is well brushed into joints.

METHOD 2

If the boards of the door are less than 20mm thick and/or thickness of the tongue & groove joints are less than 10mm, it is not possible to upgrade a ledge and braced door to 30 minutes fire protection by simply coating it.

However, by adopting the following method, it is possible to upgrade the door to 30 minutes fire protection.

  1. Sand down existing coatings and ensure all surfaces are clean, dry and free from dirt, grease, wax etc. Fill the grooves on the risk side with AM Intumescent Mastic.

  2. Cut 12mm ply inset panels to the risk side of the door. Sandwich ES/MP Intumescent Membrane between door and panel using IA Adhesive. Securely fix the panels to timber with screws etc.

  3. Apply 1 coat HW/AP Adhesion Primer to all previously painted surfaces on both sides of the door. Allow 2 hours to dry.

  4. Apply HW Intumescent system as outlined in method 1.

NOTES

Install Intumescent fire & smoke seals.

Envirograf Product 69 - Surface Mounted Fire & Smoke Seal Kits may be more appropriate which are adhered and pinned to the door frame, butting up to the door stop.

Envirograf Product 100 - Fire & Smoke Seals for rebated doors.

Envirograf Product 69 - Surface Mounted Fire & Smoke Seals for around the frames (No routing necessary).

Envirograf Product 71 - Door locks, hinges etc must be fitted with Intumescent hinge, lock and door closer protection.

The above method will upgrade suitable doors to 30 and 60 minute fire rating to achieve compliance with BS 476 Part 22

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