BBA Agrément Certificate
Mechanically fastened roof covering system.
PVC-P single-ply roofing system for mechanical fastening.
- 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.
Rigid polyisocyanurate foam insulation boards to BS 13166; with foil facing. Available in uniform thickness or tapered.
- Vapour control layer:
A 0.15 mm thick, polyethylene based, vapour control layer. Sarnavap 500E 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 the Sarnafil PVC membranes only. 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".
- Waterproof membrane:
Sarnafil S327-EL is mechanically attached to the substrate using either the Sarnafast or Sarnabar system and Sarnafil SFT or SBT tube 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.
SarnaTherm S can be attached to the substrate (deck or suitable vapour control layer) by mechanically fastening with SBT tubes and SBIW-70x70 pressure plates.
A vapour control layer will be required when SarnaTherm S 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 should be used as cushioning layer.
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
J42/10 Warm deck roof covering
J42/110 Warm deck roof covering
S327-EL Mechanically Fastened Roof System - Sarnavap 500E
Copper Patina Green
White RAL 9016 SR (solar reflective)
SarnaTherm S Tapered
Vapour control layer
Double L rainwater outlets
G/S rainwater outlets
Sarnafil Constant Force post
Sarnafil heat weldable lightning conductor clips
Sarnafil Type T
Sarnavap jointing tape
Standard product features
- Length of roll:
20 m: 15 m for 1.8 mm thick membrane.
Vapour control layer:
Low density polyethylene (LDPE).
Water vapour resistance: >450 MNs/g.
Available in standard colours. Other colours may be available, subject to a lead time and minimum order quantities.
G410-EL Adhered Roof System - Sarnavap 1000E
G410-EL Adhered Roof System - Sarnavap 5000E SA
G410-EL Adhered Roof System - Sarnavap 500E
G410-EL Adhered Roof System – Sarnavap 500E
G410-EL Ballasted Roof System - Sarnavap 1000E & S-Felt T 300
G410-EL Ballasted Roof System - Sarnavap 1000E & Sarnafil G445-13
G410-EL Ballasted Roof System - Sarnavap 5000E SA & S-Felt T 300
G410-EL Ballasted Roof System - Sarnavap 5000E SA & Sarnafil G445-13