SIGnature PU-20

Manufacturer: AccuRoof 

Materials: Polyurethane 

SIGnature PU-20 is a liquid applied roof waterproofing kit which consists of:

• SIGnature PU-20 — a one-component, polyurethane, liquid-applied waterproofing membrane
• SIGnature PU Terrace — a one-component, liquid-applied, aliphatic polyurethane top coat for use over SIGnature PU-20.

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Number: 19/5696 Issue 2
Issue date: 12/12/2023

Approved for use on

Flat Roofs Pitched Roofs 

For use as a waterproofing system on new and existing, flat and pitched, limited access roofs. When installed without the SIGnature PU Terrace, the system is only suitable for non-accessible areas or under protection.


Concrete Fibre Cement 

The system is suitable for use on the following substrates:
• concrete
• mortar
• fibre cement


10 Years 

SIGnature PU-20 will achieve an initial life expectancy of at least 25 years when used under protection or in non-accessible areas. SIGnature PU Terrace may require re-application after 10 years.

Installation Requirements

Installation of the system must be carried out by specialist roofing contractors trained and approved by the Certificate holder.

Fire Safety

When tested to DD CEN/TS 1187 : 2012, Test 4, and classified in accordance with BS EN 13501-5 : 2016, a system comprising an 8 mm fibre cement board, a base coat of SIGnature PU-20 and a top coat of SIGnature PU Terrace reinforced with SIGnature PU Reinforcing Fabric (134 g·m–2), achieved a classification of BROOF(t4).

The designation of other specifications should be confirmed by reference to the requirements of the documents supporting the national Building Regulations.

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Unit 31F, Gelders Hall Road
LE12 9NH

T : 01509 505714

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