TG66 Ballasted Roof System - Sarnavap 1000E and S-Felt T 300

Flexible Polyolefine (FPO) single-ply roofing system for ballasted warm roofs and inverted roofs.

System includes:

• Stone ballast/precast concrete flag surface protection (supplied by others).

• S-Felt T 300 upper protective layer.

• Sarnafil TG66 waterproof membrane.

• SarnaTherm G insulation.

• Sarnavap 1000E vapour control layer.

- Upper protective layer:

A separation, levelling and protection layer made of polyester (PES).

- Waterproof membrane:

Sarnafil TG66 membranes are manufactured using a specially developed in line extrusion coating process. This coats both sides of the glass-fibre carrier simultaneously with a compounded Flexible Polyethylene to produce a dynamically stable membrane, which is suitable for adhered and loose laid ballasted applications.

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.

Performance:

Certified by BBA to have a life expectancy in excess of 25 years.

Installation:

- Upper protective layer:

Loose laid according to the valid installation instructions for Sarnafil®. If necessary, S-Felt T 300 can be tacked to the substrate with Sarnacol® T 660. Adjoining sheets must overlap at least 100mm.

- Waterproof membrane:

Sarnafil TG66 is intended to be loose-laid and ballasted. Installation is carried out by Sarnafil contractors, who are specifically trained in the installation requirements of Sarnafil T membranes.

- 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 platese. 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.