Specimen specifications//3.3.3

Double layer waterproofing system for access deck for pedestrianon concrete

Bituminous membranes

Reference system / Use of roof / Finishing / Standard warm roof /
inverted roof
3.3.3 / Concrete access deck for pedestrian / paving tiles on cement screed / Without insulation
  • Substrate

Concrete or masonry

Masonry bearing elements and substrates in compliance with local technical standards

Are not accepted: slope screeds of lightweight concrete.

  • Preparation: The bearing elements and substrates must comply with local technical standards.
    After proper cleaning of the roof area, a complete level survey shall be carried out by the Contractor, Slope and planarity survey shall be carried out with the following tolerances :
  • Slope:
    Exposed roofs : Minimum slope requirement : 2 % on concrete deck (depending on the kind of terrace, please contact Siplast - Icopal).

- Water pounding area shall be identified clearly.

  • Levels:

Tolerances for planarity shall be :

- 10 mm with a 2 meters straight edge.

- 5 mm with a 200 mm straight edge.

  • Surface:

The surface shall be smooth, clean, dry and free of dust, grease, oil, foreign chemicals, curing compound,...

  • Upstands

Siplast Primer: cold-applied, quick drying, universal elastomeric bitumen primer. Approx. coverage from 0.10 litre/m² on steel to approx. 0.40 litre/m² on concrete.
Parequerre: Polyester-reinforced SBS-modified elastomeric bitumen underlayer. Cut in 0,25m wide strip for use as reinforcement angle on upstands.

Paradial S: plain aluminium-faced, glass-reinforced elastomeric bitumen cap sheet, fusible film on the underside, nominal 70mm selvedge.

Or Parafor Solo GS: polyester-reinforced, torch-applied SBS-modified elastomeric bitumen capsheet, 4 mm thick, designed for single-layer systems. Surfaced with coloured granules benefiting of a large colour range. Grooved underside (patented system) surfaced with thermofusible film.

  • Separating layer

Loose laid Verecran 100: glass fleece separating layer free-laid

  • Waterproofing

Paradiene JSR4: SBS elastomeric bitumen membrane with self-adhesive side laps as underlayer of a loose-laid two ply system under heavy protection.

Paradiene S VV: glass-reinforced, torchapplied SBS-modified elastomeric bitumen underlayer, fusible film on the upper surface, sanded or film-faced on the underside.

Draina G10: drainage and separating layer to apply under heavy ballast made of concrete screed, prefabricated slabs of concrete or hard stone.

Cement screed or concrete slab: complying with local technical standards and scope of application.

  • Details

All details shall be finalized before roofing works to start:

Rainwater drains shall be well located, in sufficient number and ready to receive waterproofing membranes.

Expansion joints shall be located at highest roof points, on reinforced concrete curbs chamfered as shown on drawings.

All pipes, cables and other penetrations shall be in place. Provision for proper waterproofing at Chillers and Machinery shall be made.

All parapets shall be in place, with provision for groove or counter flashing at an acceptable height (150 mm above finished roof level).

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