Proteus Pro-Felt Plain Dispersion Underlay - Torch-on Reinforced Bitumen Membrane

Torch-on reinforced spunbond polyester elastomeric bitumen membrane with a polypropylene finish to be used as an underlay to high performance Proteus capsheets or as part of the Proteus built-up roof system range when installing directly to asphalt, concrete or felt.

When overlaying, there may be trapped moisture in the existing roof construction. Proteus Pro-Felt® Plain Dispersion Underlay has been engineered to bond to 50% of the surface, with bituminous stripes allowing moisture gases to dissipate under the layer via channels and avoid blistering from gases which expand as they warm up.

Features and benefits:

• Manufactured in Europe.
• Designed to provide high performance at extreme temperatures at high altitudes.
• Retains its high elastomeric ability and performance and ensures the roof is protected by a durable and lasting waterproofing membrane.
• 4 kg/m² with high tensile strength.
• SBS (styrene-butadiene-styrene) modified bitumen.
• Thermofusible film.
• Polypropylene finish.
• The range includes flame-free, self-adhesive layers.
• Bespoke specifications available; consult manufacturer for details.

To be installed by roof torch flame-applied to the underside of the membrane. Ensure the bituminous stripes on the underside are heated to a sufficient level and are soundly adhered to the substrate. A partial bond of the membrane is to be achieved. All lap joints must be completely sealed, with a continuous 5 mm bitumen bead extruding from all laps. Side laps to be a minimum of 80 mm. End laps a minimum of 100 mm.