Tremco CPG UK Ltd

Alphaguard Blueshield Inverted Waterproofing System

Manufacturer: Tremco CPG UK Ltd 

Materials: two part spray applied Polyurethane 

The Certificate holder provided the following description for the system under assessment. The AlphaGuard Blueshield Inverted Blue Roof Waterproofing System consists of:

  • AlphaGuard Blueshield PMCS/01 Primer — a single-component, solvent-based primer containing di-phenylmethane di-isocyanate
  • AlphaGuard Blueshield — a two-part, solvent-free, blue-pigmented polyurethane elastomer, comprising Part A, PmB PU 0308 (catalyst/blue pigment) and Part B, Desmodur PU 0309

BBA logo

Number: 23/6877 PS1 Issue 1
Issue date: 06/06/2023

Approved for use on

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

The system is intended for use as a waterproofing layer on new or existing flat and zero fall roofs in:

  • inverted roof specifications using aggregate ballast with limited access
  • protected roof specifications using pavers or other suitable protection with limited or pedestrian access
  • green roof specifications with limited or pedestrian access
  • roof garden specifications with limited or pedestrian access
  • biodiverse specifications with limited or pedestrian access
  • blue roof specifications


Concrete Metal 

The system is suitable for use on concrete and metal substrates.


25 Years 

Under normal service conditions, the system will have a service life of at least 25 years provided it is designed, installed and maintained in accordance with this Certificate and the Certificate holder’s instructions.

Where the system is used in a fully protected specification and is subjected to normal service conditions, it will provide an effective barrier to the transmission of liquid water and water vapour for the design life of the roof in which it is incorporated, provided it is designed, installed and maintained in accordance with this Certificate and the Certificate holder’s instructions

Installation Requirements

Practicability of installation was assessed by the BBA on the basis of Certificate holder’s information. To achieve the performance described in this Certificate, the system must only be installed by contractors who have been trained and approved by the Certificate holder.

Fire Safety

Data were assessed for the following characteristics.
2.1 External fire spread

When tested to CEN/TS 1187 : 2012 Test 4, and classified to BS EN 13501-5 : 2016, the constructions given in Tables 1 and 2 of this Certificate achieved BROOF(t4) for slopes below 10°.
Please refer to Table 1 Tested unprotected systems and Table 2 Tested protected system (see BBA certificate p5 & 6)


Certified Products

The following products are also covered by the same certification:

  • Downloads

Tremco CPG UK Limited

Coupland Road

T : 01942 251 400

E :

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