Sika-Trocal SGmA Ballasted Roof System S-Vap 500E

PVC waterproof system for use on ballasted roofs.

System includes:

  • Ballast surface protection (supplied by others).
  • S-Felt T 300 or Sika-Trocal® SBV upper protection layer.
  • Sika-Trocal® SGmA waterproof membrane.
  • Polyisocyanurate foam board insulation.
  • S-Vap 500E vapour control layer.

- Upper protective layer:

S-Felt T 300:

A separation, levelling and protection layer made of polyester (PES).

- Sika-Trocal® SBV:

A protection and separation layer made of polyester (PES) fleece with a PVC-P coating on one side. The fleece free edge is 5–15 mm wide.

- Waterproof membrane:

A PVC membrane, with glass fibre reinforcement, for use in ballasted single-ply waterproof systems. The membrane contains biocides and is highly resistant to ageing, to industrial pollutants and to the bacteria that flourish in the moist layer of dirt present immediately above the membrane in ballasted roofs. It requires no maintenance throughout its service life.

The membrane is restrained by the weight of ballast, although under timber decking additional restraint such as Sika-Trocal metal discs or proprietary pressure plates may be required.

Laps are sealed with THF welding agent, with hot air sealing used at details.

- Vapour control layer:

A 0.15 mm thick, polyethylene based, vapour control layer. S-vap 500E is manufactured from low density polyethylene, blended to produce a vapour control layer that is flexible when cold, resistant to chemicals and ageing and rot proof. It is suitable for use in most mechanically fastened systems using the Sika-Trocal PVC membranes only. Not suitable for high humidity applications or under green roofs.

General information

Uniclass 2015

Ss_30_40_30_80 Single layer sheet warm roof covering systemsPrimary


J42/10 Warm deck roof covering

J42/110 Warm deck roof covering

Specification data - Single layer sheet warm roof covering systems

Product Reference

Sika-Trocal SGmA Ballasted Roof System S-Vap 500E

Upper protection layer

S-Felt T 300

Sika-Trocal SBV

Waterproof membrane



Sika-Trocal SGmA


1.5 mm

2.0 mm




Polyisocyanurate foam board

Vapour control layer

S-Vap 500E


Sika-Trocal injection moulded corners

Sika-Trocal metal

Standard product features

Vapour control layer:

- Material:

Low density polyethylene (LDPE).

- Dimensions:

  • Thickness: 0.15 mm.
  • Width: 5.0 m.
  • Roll width: 1.3 m.
  • Roll length: 25 m.

- Weight:

0.144 kg/m².

- Colour:


Product Options

Waterproof membrane:

- Dimensions:

1.5 mm thick membrane.

  • Width: 2.0 m.
  • Mass: 1.9 kg/m².

2.0 mm thick membrane.

  • Width: 2.0 m.
  • Mass: 2.5 kg/m².


  • Sika-Trocal injection moulded corners: Pre-formed pieces for forming corners.
  • Sika-Trocal metal: 0.6 mm thick galvanized steel coated on the upper side with 0.8 mm thick layer of plasticized PVC. Coloured to match the waterproof membrane. Used to produce perimeter flashings, connections and fixings.

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