Triflex Prothan Solvent-Free roof waterproofing system

Manufacturer: Triflex 

Materials: Polyurethane 

The Triflex ProThan Solvent-Free Roof Waterproofing System is based on a two-component (base and hardener), solvent-free, liquid-applied polyurethane membrane, reinforced with Triflex 110 g Reinforcement, a polyester fleece with a nominal mass per unit area of 110 g·m–2

The system is applied to provide a waterproofing membrane with a minimum dry film thickness of 2.1 mm

BBA logo

Number: 13/5051 PS7
Issue date: 09/04/2020

ETA logo

Number: 10/0254
Issue date: 22/06/2018

Approved for use on

Flat Roofs Green Roofs Inverted Roofs Pitched Roofs Protected Roofs Roof Gardens Zero Falls Buried Roofs 

For use as a fully adhered waterproofing layer on new and existing:

• exposed flat (including protected zero fall) and pitched roofs with limited access
• protected and inverted roofs with limited access
• green roofs and roof gardens


Concrete Insulation Boards PUR or PIR Insulation Reinforced Bituminous Membranes Steel 

The system has been assessed for use on:
• concrete
• steel
• PU insulation(1)
• bitumen felt

(1) The cohesive strength of the insulation must be considered with respect to the resistance to wind loading of the system

Surface Temperature Application

Installation should not be carried out during inclement weather, eg rain, fog or snow, and the ambient temperature at the time of laying must be between 8 and 35°C.


25 Years 

Accelerated weathering tests and evidence from existing installations confirm that satisfactory retention of physical properties is achieved. All available evidence indicates that under normal conditions, the system will have a service life in excess of 25 years.

Installation Requirements

The system should only be installed by installers who have been trained and approved by the Certificate holder.

Puncture Resistance

P1 - non accessible

Least compressible (eg concrete)

P4 - roof gardens, inverted roofs and green roofs)

Most Compressible Substrate (eg insulation)

Fire Safety

When tested to DD CEN/TS 1187 : 2012, Test 4, a composite build-up comprising:

  • the Triflex ProThan Roof Waterproofing System (green grey) applied at a rate of 3.11 kg·m–2 including Triflex 110 g Reinforcement
  • a 0.6 mm thick bitumen carrier membrane
  • 120 mm thick PIR Insulation board bonded to a vapour control membrane with a two-component PUR adhesive
  • 19 mm thick plywood primed with a synthetic rubber resin, when tested in the flat position in accordance with DD CEN/TS 1187 : 2012 (test 4) was classified in accordance with EN 13501-5 : 2010 as European Class BROOF(t4), and when tested in the flat position in accordance with BS 476-3 : 2004 achieved an EXT.F.AA rating. The system can contribute to a roof being unrestricted under the national Building Regulations.

Protected or inverted roof specifications, including an inorganic covering listed in the Annex of Commission Decision 2000/553/EC, can be considered to be unrestricted under the national Requirements.

The designation of other specifications should be confirmed by: England and Wales — test or assessment in accordance with Approved Document B (Volumes 1 and 2), Appendix A, clause A1. Scotland — test to conform to Mandatory Standard 2.8, clause 2.8.1. Northern Ireland — test or assessment by a UKAS accredited laboratory, or an independent consultant with appropriate experience.

In the opinion of the BBA, irrigated green roofs and roof gardens will be unrestricted under the national Requirements.

If allowed to dry, the plants used may allow the spread of flame across the roof. This must be taken into consideration when selecting suitable plants for the roof. Appropriate planting, irrigation and/or protection must be applied to ensure the overall fire-rating of the roof is not compromised.

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