G410-EL Ballasted Roof System - Sarnavap 5000E SA and Sarnafil G445-13

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 5000E SA 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 0.60 mm thick, high-performance, self-adhesive vapour control layer, manufactured from polymer modified bitumen, with glass fibre reinforcement and aluminium foil top layer. Suitable for use in high humidity environments, green roofing systems, loose-laid ballasted warm roof systems and all adhered and mechanically fastened systems. Can be used as a temporary waterproof layer for up to 4 weeks, in strict accordance with the product data sheet.

Performance:

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".

Installation:

- 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, or by bonding to Sarnavap 5000E SA using Sarnacol 2162 cold bonding adhesive or Sika C250 spray applied adhesive. 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:

Sarnavap® 5000E SA is self-adhered to the substrate. Include Sarnafil Primer 610/600 to the substrate, and in addition metal deck may need de-greasing using Sarnafil T Prep.