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Terrace and flat roof waterproofing

Waterproofing

Terrace and flat roof waterproofing

Complete terrace waterproofing with bitumen membranes, liquid polyurethane or insulated inverted systems, including parapets, drains and penetrations.

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When do you need it?

  • Stains or drips on the top-floor ceiling after rain
  • The existing membrane is over 15 years old, blistered or cracked
  • A garden, deck or solar array is planned on the terrace
  • Water ponds due to inadequate falls
  • In new builds once the screed is done, before finishes

Layer build-up

Terrace and flat roof waterproofing
  1. 52nd layer membraneSlate-surfaced, UV-resistantView product →
  2. 41st layer membrane3 mm glass fleeceView product →
  3. 3Bitumen primer0.3 kg/m²View product →
  4. 2Fall screedMinimum 1.5% fall towards drains
  5. 1Concrete slabStructure
Layers are listed bottom-up; details are finalised per project after survey.

Process

Step by step

  1. 01Survey and measurement

    Our technical team measures moisture on site, inspects existing layers and details, takes dimensions and photos.

  2. 02System selection and quote

    Based on the survey we prepare a written quote with the system and layer-by-layer materials and labour.

  3. 03Surface preparation

    Old coverings are removed if needed, the screed repaired, falls corrected and fillets formed at upstands.

  4. 04Details

    Drains, chimneys, plant supports and parapet upstands are pre-treated with reinforcement pieces.

  5. 05Membrane laying

    Once the primer dries, two staggered membrane layers are torch-applied with laps.

  6. 06Inspection and handover

    At completion we carry out a water test or visual inspection and hand over a photo report and written warranty certificate.

Products in this system

FAQ

Can you apply over the old membrane without removing it?

If the old membrane is well bonded with no trapped water, liquid PU or a new membrane layer can go over it. Blistered or wet layers must be removed.

Can terrace waterproofing be done in winter?

Bitumen membranes can be applied if the deck is dry and above +5 °C. Work stops in rain and open areas are temporarily covered.

Can tiles be laid on the terrace?

Yes; a protection screed is poured over the membrane before tiling, or flexible cementitious waterproofing is used under the tiles.

Projects

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