G410-EL Ballasted Roof System - Sarnavap 1000E & Sarnafil G445-13

G410-EL Ballasted Roof System - Sarnavap 1000E & Sarnafil G445-13

Third party certifications:
  • BBA Agrément Certificate

    BBA Agrément Certificate

    Certificate type

Sika Sarnafil

Ballasted roof covering system

Jump to:
+44 (0)1707 394444 www.sarnafil.co.uk

PVC-P single-ply membrane for adhered and ballasted warm roofs.

System includes:

  • Stone ballast/precast concrete flag surface protection (supplied by others).
  • Sarnafil G445-13 upper protective layer.
  • Sarnafil G410-EL waterproof membrane.
  • SarnaTherm G insulation.
  • Sarnavap 1000E vapour control layer.

- Upper protective layer:

A protection sheet based on polyvinyl chloride (PVC) with inlay of glass non-woven containing flame retardant.

- Waterproof membrane:

Sarnafil G 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 glass fibre 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 surface 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.

- Insulation:

Rigid polyisocyanurate foam insulation boards to BS EN 13166; with mineral tissue facing. Available in uniform thickness or tapered.

- Vapour control layer:

A 0.20 mm thick, polyethylene based, vapour control layer. Sarnavap 1000E 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 both Sarnafil PVC & FPO membranes. Not suitable for high humidity applications or under green roofs.


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".


- Upper protective layer:

Loosely laid with the jointing method chosen according expected stresses:

  • Low stresses: Overlap the sheets by 50 mm and adhere with Sarnacol® 2170 or Sarnacol 2172.
  • High stresses: Overlap the sheets by 80 mm and hot air weld with a hand welder or the Sarnamatic automatic welder.

- Waterproof membrane:

In warm ballasted applications the G410-EL membrane is loose laid, with all overlapping joints hot air welded prior to the application of a protection/ filter fleece and the chosen ballast system.

Installation is carried out by Sarnafil trained contractors.

- Insulation:

SarnaTherm G can be attached to the substrate (deck or suitable vapour control layer) by mechanically fastening with SBT tubes and SBIW-70x70 pressure plates. SarnaTherm G can be loose laid if sufficient ballast weight is provided immediately to resist wind uplift pressures.

A vapour control layer will be required when SarnaTherm G is used.

- Vapour control layer:

Loose laid over any smooth surface with all side and end laps overlapped a minimum 80 mm, then sealed with Sarnavap jointing tape. At parapets and upstands, Sarnavap must be carried up to the upper edge of the thermal insulation and sealed to the upstand/ penetration with SarnaVap jointing tape, to form an airtight seal. When installed vertically, Sarnavap must be mechanically fastened along its top edge.

If the surface is rough, a layer of Sarnafil Type T fleece should be used as cushioning layer.

General information


All Sarnafil systems are subject to a project specific specification (including design against wind uplift) to be completed by Sika Sarnafil. Please contact your local Sarnafil Technical Adviser


Sarnafil single point, insurance backed, guarantees provide cover for all Sarnafil products supplied by Sika and branded Sarnafil products supplied by Sarnafil Partner suppliers

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

G410-EL Ballasted Roof System - Sarnavap 1000E and Sarnafil G445-13


Not required

Primer 110

Upper protective layer

Sarnafil G445-13

Waterproof membrane



Sarnafil G410-EL


1.5 mm

1.8 mm


Copper Patina Green

Lead grey

Light grey

White RAL 9016 SR (solar reflective)


Loose laid




SarnaTherm G

SarnaTherm G Tapered


Consult Sika Sarnafil for recommendations and details.


Loose laid

Vapour control layer



Sarnavap 1000E


Loose laid


Double L rainwater outlets

G/S rainwater outlets

Sarnacol® 2170

Sarnacol 2172 spray applied adhesive

Sarnafil Constant Force post

Sarnafil heat weldable lightning conductor clips

Sarnafil Type T fleece


Sarnaplast 2235

Sarnavap jointing tape

Standard product features

Upper protective layer:

- Surface:


- Colour top/bottom surface:

Beige/ dark grey.

- Roll size (l x w):

15 x 2 m.

- Thickness:

1.3 mm.

- Roll weight:

51 kg.

- Reaction to fire to BS EN 11925-2 (classification to BS EN 13501-1):


- Tensile strength:

≥ 10 N/ mm².

Waterproof membrane:

- Width:

2.0 m.

- Length of roll:

20 m (15 m for 1.8 mm thick membrane).

- Weight:

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


  • Low thermal conductivity: 0.027 W/mK (thicknesses <80 mm), 0.026 W/mK (thicknesses from 80–120 mm) and 0.025 W/mK (thicknesses >120 mm).
  • Compressive strength >150 kPa at 10% deformation.
  • Typical Density of 32 kg/m³.
  • <5% smoke emission when tested to BS 5111-1.
  • CFC/ HCFC-free.
  • Zero ozone depletion potential (ODP).
  • Class O fire rating.

Vapour control layer:

- Material:

Low density polyethylene (LDPE).

- Dimensions:

  • Thickness: 0.20 mm.
  • Width: 5.0 m.
  • Roll width: 1.3 m.
  • Roll length: 25 m.

- Weight:

0.192 kg/m².

- Colour:

Blue (opaque).

- Performance:

Water vapour resistance: >800 MNs/g.

Product Options

Waterproof membrane:

- Colour:

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


  • Double L rainwater outlets: Insulated outlets.
  • G/S rainwater outlets: Injection moulded PVC outlets and scuppers.
  • Primer 110: Surface primer creating a key for Sarnaplast 2235.
  • Sarnacol® 2170 or 2172 upper protective layer adhesive.
  • Sarnafil Constant Force post: Cable-based fall arrest and restraint system.
  • Sarnafil Double L: High drainage capacity insulated rainwater outlet.
  • Sarnafil heat weldable lightning conductor clips.
  • Sarnafil Type T fleece: For use with Sarnavap 1000E VCL.
  • Sarnametal: Galvanized metal sheet with Sarnafil G410-12EL factory laminated to it, for use in prefabricate flashings and drip details.
  • Sarnaplast 2235: Elastic one-part silicone sealant for sealing edges and perimeter upstand flashing terminations.
  • Sarnavap jointing tape: For use with Sarnavap 1000E VCL.

Digital objects
PlatformCompatibleVersionCertified to
IFC2X3 4 1.3
Revit 2016 8 2.0
- 1.0
- 2
- 1.0
Download now from NBS National BIM Library
Third party certifications
Similar products from Sika Sarnafil