Product Data Sheet Show all documents

Sarnafil® G 476-20 (CN_GB)

POLYMERIC MEMBRANE FOR BALLASTED ROOF WATERPROOFING

Sarnafil® G 476-20 (CN_GB) (thickness 2.0 mm)  is a multi-layer, synthetic roof waterproofing membrane based on polyvinyl chloride (PVC) with an inlay of non-woven glass fibre. Sarnafil® G 476-20 (CN_GB) is a hot-air weldable roof membrane, formulated and designed for use in all global climatic conditions.

  • Proven performance over decades
  • High dimensional stability from glass fleece inlay
  • High water vapour permeability
  • Resistant to all common environmental influences
  • Resistant to mechanical influences
  • Resistant to micro-organisms
  • Resistant to root penetration
  • Hot-air weldable
  • No open flame equipment required
Sarnafil® G 476-20 (CN_GB)
Product Data Sheet Show all documents

Usage

Waterproofing membrane for ballasted roofs:
  • Roof gardens (intensive / extensive)
  • Utility roofs
  • Inverted roofs
Waterproofing membrane for applications with a ballasted protection layer:
  • Balconies and terraces
  • Plaza decks
  • Planters
  • Split slab applications
  • Concrete slabs
 

Advantages

  • Proven performance over decades
  • High dimensional stability from glass fleece inlay
  • High water vapour permeability
  • Resistant to all common environmental influences
  • Resistant to mechanical influences
  • Resistant to micro-organisms
  • Resistant to root penetration
  • Hot-air weldable
  • No open flame equipment required

Packaging

Standard rolls are wrapped individually in a blue PE-foil.

Packing unit

Refer to price list

Roll length

15.00 m

Roll width

2.00 m

Roll weight

81.00 kg

Refer to current price list for packaging variations.

Colour

Surface

Matt

Colours

Top Surface

Orange

Bottom surface

Dark grey

Product Details

Sustainability / Certifications / Approvals

APPROVALS / STANDARDS

  • CE Marking and Declaration of Performance to EN 13956 - Polymeric sheets for roof waterproofing
  • Quality Management System in accordance to EN ISO 9001/ 14001
  • Certified Singapore Green Building Product - SGBC Green Marks 4 Ticks: Leader
Product Information

Product Declaration

EN 13956: Polymeric sheets for roof waterproofing

Chemical Base

Polyvinyl Chloride (PVC)

Shelf Life

5 years from date of production.

 

Storage Conditions

Product must be stored in original unopened and undamaged packaging in dry conditions and temperatures between +5 °C and +30 °C. Store in a horizontal position. Do not stack pallets of the rolls on top of each other, or under pallets of any other materials during transport or storage. Always refer to packaging.

Visible Defects

Pass

(EN 1850-2)

Length

15.00 m (-0 / +5 %)

(EN 1848-2)

Width

2.00 m (-0.5 / +1 %)

(EN 1848-2)

Effective Thickness

2.0 mm (-5 / +10 %)

(EN 1849-2)

Straightness

≤  30 mm

(EN 1848-2)

Flatness

≤  10 mm

(EN 1848-2)

Mass per Unit Area

2.55 kg/m2 (-5 % / +10 %)

(EN 1849-2)
System information

System Structure

The following products must be considered for use depending on roof design:

  • Sarnafil® G 410-15 Sheet for detailing
  • Sarnafil® Metal Sheet
  • Sarnabar or S-U Bar
  • S-Welding Cord
  • Sarna Seam Cleaner
  • Sarna Cleaner
  • S-Felt

Ancillary products: wide range of accessories is available e.g. prefabricated parts, roof drains, scuppers, protection sheets and separation layers.

Compatibility

Not compatible in direct contact with bitumen, tar, fat, oil, solvent containing materials and other plastic materials, e.g. Expanded Polystyrene (EPS), Extruded Polystyrene (XPS), Polyurethane (PUR), Polyisocyanurate (PIR) or Phenolic Foam (PF). Use an approved separation layer to completely separate Sarnafil G 476 from any incompatible materials.
Technical Information

Resistance to Impact

Hard substrate

≥ 700 mm

Soft substrate

≥ 1250 mm

Resistance to Static Load

Soft substrate

≥ 20 kg

Rigid substrate

≥ 20 kg

Resistance to Root Penetration

Pass

(EN 13948)

Pass

(FLL)

Tensile Strength

Longitudinal (md)1)

≥ 8.5 N/mm2

Transversal (cmd)2)

≥ 8.5 N/mm2

1) md =      machine direction
2) cmd =    cross machine direction

Elongation

Longitudinal (md)1)

≥ 180 %

Transversal (cmd)2)

≥ 180 %

1) md =      machine direction
2) cmd =    cross machine direction

Joint Shear Resistance

≥  500 N/50 mm

(EN 12317-2)

Dimensional Stability

Longitudinal (md)1)≤  |0.2| %
Transversal (cmd)2)≤  |0.2| %

1) md = machine direction
2) cmd = cross machine direction

Foldability at Low Temperature

≤  -25 °C

(EN 495-5)

Water Tightness

Pass

(EN 1928)

Effect of Liquid Chemicals, Including Water

On request

(EN 1928)

Resistance to UV Exposure

Not resistant for permanent exposure to UV irradiation.

Reaction to Fire

Class E

(EN ISO 11925-2, classification to EN 13501-1)

Application

Application Information

Ambient Air Temperature

-20 °C min. / +60 °C max.

Substrate Temperature

-30 °C min. / +60 °C max.
Application steps

EQUIPMENT

Hot welding overlap seams
Electric hot-air welding equipment, such as hand held manual hot-air welding equipment and pressure rollers or automatic hot-air welding machines with controlled hot-air temperature capability of a minimum +600 °C.
Recommended type of equipment:

  • Manual: Leister Triac
  • Automatic: Sarnamatic 681

SUBSTRATE QUALITY

  • The supporting structure must be of sufficient structural strength to apply all new and existing layers of the roof build-up. Complete roof system must be designed and secured against wind uplift loadings.
  • The substrate surface must be uniform, smooth and free of any sharp protrusions or burrs, etc.
  • Sarnafil® G 476-20 (CN_GB) must be separated from any incompatible substrates / materials by an effective separation layer to prevent accelerated ageing.
  • The supporting layer must be compatible to the membrane, solvent resistant, clean, dry and free of grease and dust.
  • Metal sheets must be degreased with Sarna Cleaner before adhesive is applied.

APPLICATION

Installation procedure
Strictly follow installation procedures as defined in method statements, application manuals and working instructions which must always be adjusted to the actual site conditions.
 

Fully Adhered System

  • Sarnafil G 476 is lay flat without creases and fully adhered / bonded on roof surfaces and junction areas by suitable Sarnacol adhesive (See Sarnacol PDS).
  • For main roof areas, overlap seams of 80 mm are hot air welded by automatic hot air welding machines, wherever possible, with controlled hot air temperature to ensure a good and continuous fused seam weld.
  • For detailing and corner areas, overlap seams are welded manually with hand held hot air welding gun and pressure rollers, best by skilled welders.
  • The roof perimeter has to be fixed mechanically with Sarnabar / S-U bar to keep the membrane in place.
  • It is then covered with ballast or a protection layer immediately after laying and seam welding.
 

Balconies, terraces and plaza decks

  • A protective sheet of Sarnafil® Protective Sheet or S-Felt Type GK must be installed on top of the Sarnafil® G 476-20 (CN_GB) membrane.
  • The ballasted protective layer (slabs, tiles, etc) must be installed on top of a drainage layer (chippings, gravel, elevated beds or similar).
     

Flashings
Refer to standard details in Application Manual                                                                                             

Hot welding overlap seams
Overlap seams must be welded by electric hot-welding equipment. Welding parameters including temperature, machine speed, air flow, pressure and machine settings must be evaluated, adapted and checked on site according to the type of equipment and the climatic conditions prior to welding. The effective width of welded overlaps by hot-air must be a minimum 20 mm.

Testing overlap seams
The seams must be mechanically tested with screw-driver (rounded edges) to ensure the integrity/completion of the weld. Any imperfections must be rectified by hot-air welding.

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