Chesterplus 3H

Perforated Venting Base Layer

Chesterplus 3H is a perforated pour and roll membrane which offers vapour dispersement prior to fitting the second and third waterproofing layers. It features a glass fibre core which is saturated and coated in high quality bitumen, and has a light sand finish.

When incorporated in a suitably designed and installed multi-layer system, maintained in accordance with BS 8217:2005 – Reinforced bitumen membranes for roofing, Chesterplus 3H will provide reliable performance.

Key Features & Benefits:

• Vapour disperse layer

• Integral part of built-up flat roofing system

• Simple, loose-laid application


Chesterplus Perforated

Accreditations and Certifications

Product Information
Product CodeRoll LengthRoll WidthPallet Quantity
P36020m1m30 rolls


To complete a full system, Chesterplus 3H is fitted as the initial venting layer and is overlayed with suitable Chesterfelt underlay and capsheet membranes. When used as part of a multi-layer built up roofing system, it provides reliable waterproofing protection and is suitable for use on a wide range of buildings.

Installation Guidelines

This product should be installed in accordance with manufacturer recommendations and all relevant national standards and codes of practice, including BS 8217:2005 – the code of practice for reinforced bitumen membranes for roofing.

Maintenance and Repair

Routine inspection, cleaning and maintenance of the roof membranes should be based on the recommendation in BS 8217:2005. Should it be damaged either during construction or at later date, then the repairs should be made using the same materials so that the performance of the built-up membranes is retained.


Manufactured in accordance with BS EN 13707:2004+A2:2009 – Flexible sheets for waterproofing. Reinforced bitumen sheets for roof waterproofing.

Handling and Storage

The material should be stored vertically on a firm flat surface and transported stood on end to avoid damage.

Health and Safety

Health and Safety should be observed at all times in accordance with HSE and industry guidance. Specific Risk Assessments and Method Statements should be produced by contractors where necessary to ensure Working at Heights, Fire Safety and Manual Handling rules are compliant with current law and regulations. Health and safety data sheets are available for all materials on request from Chesterfelt


UKCA certified & CE Marked to EN 13707:2004+A2:2009.
CE Certificate Number: 0086-CPR-595938.
UKCA Certificate Number: 0086 CPR 753192.

Quality Assurance

Chesterplus 3H is manufactured in accordance with BS EN ISO 9001:2015 – Quality Management Systems (QMS).

NBS Source

Chesterplus 3H is listed on NBS Source.

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