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SikaTrocal SGmA Mechanically Fastened Timber Decking Surface Protection

SikaTrocal SGmA Mechanically Fastened Timber Decking Surface Protection

Third party certifications:
  • BBA Agrément Certificate

    BBA Agrément Certificate

    Certificate type


PVC waterproof system with glass fibre reinforcement for mechanically fastened applications.

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+44 (0)1707 394444 www.sikatrocal.co.uk

A PVC waterproof system which uses a membrane with glass fibre reinforcement, for use in mechanically fastened timber deck roof systems.


  • Timber decking surface protection.
  • S-Felt T 300 or Sika-Trocal® SBV lower protection layer.
  • Sika-Trocal® SGmA waterproof membrane.
  • Polyisocyanurate foam board insulation.
  • S-Vap 500E vapour control layer.

- Lower protection layer:

S-Felt 300:

A 300 g/m² polypropylene fleece used either as a protective layer below the waterproof liner or as a protective layer on top of the liner. UV stabilised S-Felt Type T can be left exposed to weathering.

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:

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 usually restrained by the weight of ballast, however under timber decking additional restraint such as Sika-Trocal metal discs or proprietary pressure plates are 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 Mechanically Fastened Timber Decking Surface Protection

Lower protection layer

S-Felt T 300

Sika-Trocal® SBV

Waterproof membrane



Sika-Trocal SGmA


1.5 mm

2.0 mm



Foam board insulation


Vapour control layer

S-Vap 500E


Sika-Trocal injection moulded corners

Sika-Trocal metal

Standard product features

Lower protection layer:

- S-Felt 300:

  • Size: 2 x 50 m.
  • Thickness: 2.5 mm.
  • Colour: White.

- Sika-Trocal® SBV:

  • Size: 2 x 20 m.
  • Thickness: 1.7 mm.
  • Colour: Fleece: white, PVC: Anthracite.

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:


- Performance:

Water vapour resistance: 476 MNs/g.

Product Options

Waterproof membrane:

- 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.

Third party certifications
  • 95/3092
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