Sarnafil® S 327-20 L
POLYMERIC PVC MEMBRANE FOR MECHANICALLY FASTENED ROOF WATERPROOFING
Sarnafil® S 327-20 L (thickness 2.0 mm) is a polyester reinforced, multi-layer, synthetic roof waterproofing sheet based on polyvinyl chloride (PVC) containing ultraviolet light stabilizers according to EN 13956/GB 12952. Sarnafil® S 327-20 L is a hot air weldable roof membrane formulated for direct exposure and designed to use in all global climatic conditions.
- Proven performance over decades
- Lacquer coated surface
- Resistant to permanent UV exposure
- Resistant to permanent wind exposure
- Resistant to all common environmental influences
- Hot air weldable
- No open flame equipment required
- High water vapour permeability
Usage
Sarnafil® S 327-20 L may only be used by experienced professionals. Waterproofing membrane for:- Mechanically fastened roofing systems
Advantages
- Proven performance over decades
- Lacquer coated surface
- Resistant to permanent UV exposure
- Resistant to permanent wind exposure
- Resistant to all common environmental influences
- Hot air weldable
- No open flame equipment required
- High water vapour permeability
Packaging
Sarnafil® S 327-20 L 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 kg |
Colour
| Surface | matt |
| Colours | |
| Top Surface | light grey |
| Bottom surface | dark grey |
Top surface of sheet, other colours on request, subject to minimum order quantities.
Product Details
ENVIRONMENTAL INFORMATION
- Conformity with LEED v4 SSc 5 (Option 1): Heat Island Reduction - Roof (only white)
- Conformity with LEED v4 MRc 3 (Option 2): Building Product Disclosure and Optimization - Sourcing of Raw Materials
- Conformity with LEED v4 MRc 4 (Option 2): Building Product Disclosure and Optimization - Material Ingredients (only light grey and white)
APPROVALS / STANDARDS
- GB 12952, Sarnafil® S 327-20 L, Test report No. RS19-21
- CE Marking and Declaration of Performance to EN 13956 - Polymeric sheets for roof waterproofing
- Included in BRANZ Appraisal #619, Sarnafil Roof and Deck Membrane System
Product Declaration
EN 13956 Polymeric sheets for roof waterproofing
GB 12952 Type P
Chemical Base
Polyvinyl Chloride (PVC)
Shelf Life
5 years from date of production.
Storage Conditions
Product must be stored in original unopened and undamaged sealed 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 m (-0 % / +5 %) | (EN 1848-2) |
Width
| 2 m (-0,5 % / +1 %) | (EN 1848-2) |
Effective Thickness
| 2,0 mm (-5 % / +10 %) | (EN 1849-2) |
Overall Thickness
| 2,0 mm (-5 % / +10 %) | (GB 12952) |
Straightness
| ≤ 30 mm | (EN 1848-2) |
Flatness
| ≤ 10 mm | (EN 1848-2) |
Mass per Unit Area
| 2,4 kg/m² (-5 % / +10 %) | (EN 1849-2) |
System Structure
The following products must be considered for use depending on roof design:
- Sarnafil® G 410-20 L Sheet for detailing
- Sarnafil® Metal Sheet PVC
- Sarnabar® / Sarnafast®
- S-Welding Cord PVC
- Sarnacol® 2170 (contact adhesive)
- Sarna Cleaner
Ancillary Products: e.g. Prefabricated parts, roof drains, scuppers, walkway pad, decor profiles, protection sheets.
Compatibility
Not compatible in direct contact with bitumen, tar, fat, oil, solvent containing materials and other plastic materials. Must be isolated from contact with building wrap systems (including building wraps with self-adhesive backings) and flashing tapes. Refer to Sika for detailing advice.
Insulated boards of expanded polystyrene (EPS), extruded polystyrene (XPS), polyurethane (PUR), polyisocyanurate (PIR) or phenolic foam (PF) should be isolated from the membrane either with integral aluminium or glass tissue facers, or with separation cloth such as Sarnafil S-Felt. Direct contact with any of the above materials could adversely affect the product properties.
Resistance to Impact
| hard substrate | ≥ 900 mm |
| soft substrate | ≥ 1250 mm |
| pass | (GB/T20624.2) |
Hail Resistance
| rigid substrate | ≥ 35 m/s |
| flexible substrate | ≥ 40 m/s |
Resistance to Static Load
| soft substrate | ≥ 20 kg |
| rigid substrate | ≥ 20 kg |
| pass | (GB/T328.25) |
Tensile Strength
| longitudinal (md)1) | ≥ 1000 N/50 mm |
| transversal (cmd)2) | ≥ 1000 N/50 mm |
| longitudinal (md)1) | ≥ 250 N/cm |
| transversal (cmd)2) | ≥ 250 N/cm |
1) md = machine direction
2) cmd = cross machine direction
Elongation at maximum tensile stress
| longitudinal (md)1) | ≥ 15 % |
| transversal (cmd)2) | ≥ 15 % |
1) md = machine direction
2) cmd = cross machine direction
Elongation
| longitudinal (md)1) | ≥ 12 % |
| transversal (cmd)2) | ≥ 12 % |
1) md = machine direction
2) cmd = cross machine direction
Tear Strength
| longitudinal (md)1) | ≥ 200 N |
| transversal (cmd)2) | ≥ 200 N |
| longitudinal (md)1) | ≥ 250 N |
| transversal (cmd)2) | ≥ 250 N |
1) md = machine direction
2) cmd = cross machine direction
Joint Peel Resistance
| Failure mode: C, no failure of the joint | (EN 12316-2) |
| ≥ 3 N/mm | (GB/T328.21) |
Joint Shear Resistance
| ≥ 800 N/50 mm | (EN 12317-2) |
Dimensional Stability
| longitudinal (md)1) | ≤ |0,4| % |
| transversal (cmd)2) | ≤ |0,4| % |
| longitudinal (md)1) | ≤ |0,5| % |
| transversal (cmd)2) | ≤ |0,5| % |
1) md = machine direction
2) cmd = cross machine direction
Solar Reflectance
| 0,80 | (GJB 2502.2) |
Solar Reflectance Index
| Colour | Initial |
| white | 108 |
Foldability at Low Temperature
| ≤ -25 °C | (EN 495-5) |
| ≤ -25 °C | (GB/T328.15) |
Water Absorption
| wet weight | ≤ 4 % |
| dry weight | ≥ -0,4 % |
Water Tightness
| pass |
Effect of Liquid Chemicals Including Water
| breaking strength retention | ≥ 85 % |
| elongation at break ret. | ≥ 80 % |
| low temperature bend | pass |
Resistance to UV Exposure
| Pass (> 5000 h / grade 0) | (EN 1297) |
Resistance to Weathering
| breaking strength retention | ≥ 85 % |
| elongation at break ret. | ≥ 80 % |
| low temperature bend | no crack |
Retention of Properties after Heat Ageing
| breaking strength retention | ≥ 85 % |
| elongation at break ret. | ≥ 80 % |
| low temperature bend | pass |
External Fire Performance
| BROOF (t1) < 20° | (EN 1187) |
| (EN 13501-5) | |
Reaction to Fire
| Class E | (EN ISO 11925-2, classification to EN 13501-1) (GB 8624) |
Application
Ambient Air Temperature
-20 °C min. / +60 °C max.
Substrate Temperature
-30 °C min. / +60 °C max.
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 : Leister Varimat
- Semi-automatic: Leister Triac Drive
SUBSTRATE QUALITY
The substrate surface must be uniform, smooth and free of any sharp protrusions or burrs, etc. Sarnafil® S 327-20 L must be separated from any incompatible substrates / materials by an effective separation layer to prevent accelerated ageing. The supporting layer must be compatible with 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.
Fixing method - General
The waterproofing membrane is installed by loose laying (without stretching membrane or installing under tension) with mechanical fastening in seam overlaps or independent from overlaps. Overlap seams are hot welded using specialised hot air equipment.
Fixing method - Linear fastening (Sarnabar®)
Unroll the Sarnafil® S 327-20 L membrane, overlap by 80 mm, weld immediately and fix to the substructure by means of the Sarnafast® fasteners. The preferred type of fastening will be advised by Sika. The spacing of the fasteners is in accordance with the project specific Sika calculations. The perimeter piece ends must be secured with the Sarnabar® Load Distribution Plate. For protection fasten a piece of Sarnafil® S 327-20 L under bar end and plate. Leave a 10 mm clearance between bar ends. Do not fasten in hole nearest bar end. Cover the bar ends with a piece of Sarnafil® S 327-20 L and weld. After installation the Sarnabar® must immediately be made watertight with a Sarnafil® S 327-20 L cover strip. At upstands and at all penetrations, the Sarnafil® S 327-20 L membrane must be secured with a Sarnabar®. The 4 mm diameter S-Welding Cord protects the Sarnafil® S 327-20 L roof covering against tearing and peeling off by wind uplift.
Fixing method - Spot fastening (Sarnafast®)
Sarnafil® S 327-20 L must always be installed at right angles to the deck direction. Sarnafil® S 327-20 L is fixed by means of the Sarnafast® fasteners and barbed washers/tubes along the marked line, 35 mm from the edge of the membrane. Sarnafil® S 327-20 L is overlapped by 120 mm. The spacing of the fasteners is in accordance with the project specific Sika calculations. At upstands and at all penetrations, the Sarnafil® S 327-20 L membrane must be secured with a Sarnabar®. The 4 mm diameter S-Welding Cord protects the Sarnafil® S 327-20 L roof covering against tearing and peeling off by wind uplift.
Fixing method - Field fastening (Sarnaweld or Rhinobond)
Sarnafil® S 327-20 L is fixed by induction welding Sarnadisc hot melt coated washers and Sarnafast® fasteners according to the project specific instructions. Sarnafil® S 327-20 L is overlapped by 80 mm. The spacing of the fasteners is in accordance with the project specific Sika calculations. At upstands and at all penetrations, the Sarnafil® S 327-20 L membrane must be secured with a Sarnabar®. The 4 mm diameter S-Welding Cord protects the Sarnafil® S 327-20 L roof covering against tearing and peeling off by wind uplift.
Hot welding method
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.
Testing overlap seams
The seams must be mechanically tested with a screw driver (rounded edges) to ensure the integrity/completion of the weld. Any imperfections must be rectified by hot air welding.