Sarnafil S327-EL Mechanically Fastened Cold Roof System

Sarnafil S327-EL Mechanically Fastened Cold Roof System

Sika Sarnafil Third party certifications:
  • BBA Agrément Certificate

    BBA Agrément Certificate

    Certificate type

PVC-P single-ply membrane with polyester reinforcement, for mechanical fastening.

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PVC-P single-ply membrane system for mechanical fastening on cold roofs.

System (can) include:

  • Sarnafil S327-EL waterproof membrane.
  • Optional Sarnafil Type T fleece or A fleece as cushion layer, mechanically fixed.

- Waterproof membrane:

Sarnafil S membranes are manufactured using a state of the art extrusion coating process that eliminates shrinkage and plastic memory and produces a dynamically stable membrane. In the coating process, a polyester scrim carrier is coated on both sides with liquid Plastisol, prior to the application of a lacquer coating on the upper surface and laser marking of the membrane for identification. The unique lacquer coating eliminates the need for biocides, provides the membrane with an easy to clean surface and prolongs the life of the membrane by reducing plasticiser loss.

The process enables between 2% and 5% of recycled material to be used in the production of new membranes.

- Fleece (cushion layer):

A polypropylene fleece used either as a protective layer below the waterproof liner or as a protective layer on top of the liner.

  • Sarnafil Type A: Is not UV stabilised and must not be subjected to external weather conditions for prolonged periods of time.
  • Sarnafil Type T: UV stabilised, can be left exposed to weathering.


Certified by BBA, in their opinion, to have a "life expectancy in excess of 40 years" for exposed applications, with periodic maintenance as stated below.

A planned maintenance cycle, including inspections by the Certificate holder at minimum intervals of five years, should be introduced if an extended service life is required. The Certificate holder can advise on methods of extending the service life. This could include the use of thicker membranes, specific maintenance requirements or localised replacement and repair.

Should the maintenance cycle not be followed Sarnafil G/S membranes have been given, by the BBA in their opinion, a life expectancy of "in excess of 35 years".


- Waterproof membrane:

Sarnafil S327-EL is mechanically attached to the substrate using either the Sarnafast or Sarnabar system and suitable Sarnafil fasteners. Laps are then hot air welded to form seams which are stronger than the membrane itself.

Installation is carried out by Sarnafil trained contractors.

- Fleece (cushion layer):

Sarnafil Type A and Type T:

Sarnafil Type A and Type T are generally loose laid, but can be partially bonded to the substrate with Sarnacol 2170 or Sarnacol 2172 if required. In either application, all edges must be overlapped by at least 100 mm.

General information

Uniclass 2015

Ss_30_40_30_78 Single layer sheet cold roof covering systemsPrimary


J42/130 Cold deck roof covering

Specification data - Single layer sheet cold roof covering systems

Product Reference

Sarnafil S327-EL Mechanically Fastened Cold Roof System


Not required

Primer 110

Waterproof membrane



Sarnafil S327-EL


1.2 mm

As standard.

1.5 mm

1.8 mm


Copper Patina Green

Lead grey

Light grey

White RAL 9016 SR (solar reflective)


Mechanically fastened


Not required

Sarnafil Type A

Sarnafil Type T


G/S rainwater outlets

Sarnafil Constant Force post

Sarnafil heat weldable lightning conductor clips


Sarnaplast 2235

Standard product features

Waterproof membrane:

- Width:

2.0 m.

- Length of roll:

20 m: 15 m for 1.8 mm thick membrane.

- Weight:

  • 1.2 mm thick: 1.50 kg/m².
  • 1.5 mm thick: 1.90 kg/m².
  • 1.8 mm thick: 2.30 kg/m².

Fleece (cushion layer):

  • Size: 2 x 50 m.
  • Weight: 300 g/m².

Product Options

Waterproof membrane:

- Colour:

Available in standard colours. Other colours may be available, subject to a lead time and minimum order quantities.


  • G/S rainwater outlets: Injection moulded PVC outlets and scuppers.
  • Primer 110: Surface primer creating a key for Sarnaplast 2235.
  • Sarnafil Constant Force post: Cable-based fall arrest and restraint system.
  • Sarnafil heat weldable lightning conductor clips.
  • Sarnametal: Galvanized metal sheet with Sarnafil G410-12EL factory laminated to it, for use in prefabricated flashings and drip details.
  • Sarnaplast 2235: Elastic one-part silicone sealant for sealing edges and perimeter upstand flashing terminations.

Third party certifications
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