Sika-Trocal Approved Contractor

Graham Roofing (Scotland) Limited is a Sika-Trocal Single-Ply Roofing approved contractor based in Glasgow and operating throughout Scotland and the North of England.

Sika-Trocal Single-Ply Roofing - Roofing System Options


Sika-Trocal roofing membranes can be installed in a variety of new build and refurbishment roof, both warm and cold. Each installation options offers its own benefits to the specifier and client, with low maintenance and low whole life cost being demonstrated consistently across all applications.


The British Board of Agrément Certificates, listed below, cover all Sika-Tropcal single-ply membranes.

  • Certificate number 95/3092 covers Sika-Trocal Type S and SG.
  • Certificate number 91/2649 covers Sika-Trocal Type SGK.
  • Certificate number 94/3060 covers Sika-Trocal Type SGmA.


The British Board of Agrément have given the Sika-Trocal Type S, SG, SGK and SGmA membranes a stated life expectancy 'in excess of 30 years'.

Mechanical Fastened Installation

The majority of Sika-Trocal installations are mechanically fastened; this is primarily due tothe speed on installation of the Sika-Trocal Disc System.

The significant benefit of the Sika-Trocal Disc System over other conventional systems is that this single fastener and plate combination is used to mechanically attach the thermal insulation and membrane to the roof, saving the expense of 2 attachement systems.

Adhered Installation

In situations where a Siki-Trocal mechanically fastened or ballasted membrane is not suitable for a particular project then the adhered Type SGK can offer a viable solution. Typical examples of this are swimming pools and laundry rooms, where the high humidity requiries the use of high cost stainless steel fasteners, renovation of existing failed roofs, concretedeckas and where fasteners cannot be visible internally.

Green and Ballasted Installations

A ballasted roofing system will normally be surfaced with gravel or pavers and with the membrane laid above the insulation. In some cases when creating green roofs the membrane may be located under the insulation in an 'inverted' situation.

Sika-Trocal Type SGmA membrane is loose laid over the substrate and fastened at the perimeters and around penetrations prior to the installations of the ballasting material, typically round washed stone, pavers or roof greening.

Roof greening systems are generally categorised as Intensive, Extensive or Biodiverse depending on the type of planting used and the level of amenity required.

More Information

Sika Trocal: http://gbr.sika-trocal.sika.com/

  • CHAS
  • BSI 18001
  • Intelligent Membrane Trade Association
  • Gas Safe Register
  • NFRC
  • Construction Line
  • Sika Liquid PLastics
  • BSI 14001
  • BSI 9001
  • SFHA