Kemper System Ltd

Kemperol 2K-PUR Roof Waterproofing System

Manufacturer: Kemper System Ltd 

Materials: Polyurethane 

The Kemperol 2K-PUR Roof Waterproofing System is a cold liquid-applied polyurethane coating reinforced with an embedded polyester fleece to provide a waterproofing membrane with a minimum dry film thickness of 2 mm. 1.2 The system components are:

• Kemperol 2K-PUR Resin — a two-component, solvent-free liquid-applied resin that cures to form a flexible waterproofing membrane
• Kemperol 165 Fleece — a polyester fleece for embedding into Kemperol 2K-PUR Resin to act as reinforcement. The fleece has the nominal characteristics of:
– weight per unit area (g·m–2) 165 ± 10%
– tensile strength (N·50 mm–1) ≥ 250
– elongation at break (%) ≥ 40
– roll length (m) 50
– roll width (mm) 105, 210, 262.5, 350, 525, 700 and 1050.

BBA logo

Number: 06/4388
Issue date: 02/08/2019

ETA logo

Number: 03/0044
Issue date: 24/11/2016

Approved for use on

Balconies, Terraces & Walkways Brown Roofs Flat Roofs Green Roofs Pitched Roofs Protected Roofs Roof Gardens Zero Falls Buried Roofs 

The Kemperol 2K-PUR Roof Waterproofing System is satisfactory for use as a built-up system on pitched, flat and zero fall roofs with limited access. The system is also satisfactory for use as a built-up system on roofs with limited or pedestrian access in:
• roof gardens (intensive) on flat roofs
• green roofs (extensive) on flat and pitched roofs
• biodiverse roofs
• brown roofs
• protected terraces/balconies with pedestrian access.


Acrylic Glazing Aluminium Concrete Copper Fibre Cement Glass Insulation Boards Lead Mastic Asphalt PUR or PIR Insulation Reinforced Bituminous Membranes Single Ply Membranes - PVC Steel Tiles Timber Zinc 

When treated with the appropriate primer in accordance with the Certificate holder’s instructions, the Kemperol 2K-PUR Roof Waterproofing System is suitable for use on substrates of:
• acrylic glazing
• aluminium
• bituminous felts including polymer-modified hot- and cold-applied bitumens and bitumen emulsions
• concrete and concrete screeds cured sufficiently to achieve the required bond strength
• copper
• fibre-reinforced cement sheeting
• glass
• lead
• lightweight concrete
• mastic asphalt to BS 8218 : 1998
• polyisocyanurate insulation board (PIR)(1)
• stainless steel V2A
• steel to CP 143-10 : 1973
• tiles (glazed and unglazed)
• timber, including appropriate grade plywood (minimum EN 636-2 : 1997) and oriented strand board (OSB3) (EN 300 : 2006)
• zinc.
(1) The Certificate holder should be consulted for specific advice on board facing compatibility.

The substrate list represents a guide to the user; adhesion should be confirmed by test if necessary


25 Years 

Under normal service conditions, the system will provide a durable waterproof covering with a service life of at least 25 years.

Installation Requirements

Installation of the system must only be carried out by installers trained and approved by the Certificate holder.

Puncture Resistance

P1 - non accessible

Most Compressible Substrate (eg insulation)

P4 - roof gardens, inverted roofs and green roofs)

Least compressible (eg concrete)

Fire Safety

A system comprising 12 mm thick Superlux board primed with a coat of Kempertec D-Primer, a coat of Kemperol 2K-PUR Resin embedded with a single layer of polyester fleece covered with a further coat of Kemperol 2K-PUR Resin and a layer of kiln dried quartz sand is unrestricted under the national Building Regulations. Warrington Fire Research, fire report reference 138673, 02/04/2004. Report available upon request from the Certificate holder.

In the opinion of the BBA, a roof incorporating the system will be unrestricted under the national Building Regulations in the following circumstances: a roof garden covered with a drainage layer of gravel 100 mm thick and a soil layer 300 mm thick, when protected by an inorganic covering (eg gravel or paving slabs) listed in the Annex of Commission Decision 2000/553/EC and in irrigated green roofs, roof gardens, biodiverse roofs or brown roofs.

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.

If allowed to dry plants used may allow the spread of flame across the roof. This must be taken into consideration when selecting suitable plants. 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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Kemper System Ltd

Kemper House
30 Kingsland Grange

T : 01925 445532

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