FlexiProof Water Block Mastic – Compression Sealant for EPDM

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Manufacturer/Brand: Flexiproof EPDM Rubber

WATER-BLOCK/SEAL

£10.45 GBP
£10.45 GBP
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FlexiProof Water Block Mastic is a specialist sealant designed to provide a reliable and long-lasting compression seal during EPDM roofing installations. Perfect for use with termination bars and compression-type seals such as roof drains, this high-performance mastic ensures a watertight finish between EPDM membranes.

Its unique formulation remains tacky throughout its lifespan, offering continued flexibility and sealing performance over time. Easy to apply and highly effective, FlexiProof Water Block Mastic is an essential component for professional EPDM roofing systems.

Key Features:

  • Designed for termination bar installations.
  • Provides a durable compression seal between EPDM sheets.
  • Ideal for use around roof drains and other compression-type terminations.
  • Light grey in colour for a neat, professional finish.
  • Remains tacky permanently – no hardening or cracking.
  • Easy to apply with a standard mastic gun.

Coverage: approx. 3 linear metres per tube

Application Note: Ensure surfaces are clean and dry before application for optimal sealing performance.

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Additional Information for FlexiProof Water Block Mastic – Compression Sealant for EPDM

Technical Information

Flexiproof EPDM Product Brochure

Delivery Information

Delivery & Collection Information

Nationwide Delivery

We offer delivery of our EPDM roofing products to all Mainland UK postcode regions on a 1 to 5 working day basis. For deliveries to the Scottish Highlands and UK Islands, please allow up to 7 working days.

Please note:

Orders may arrive in multiple deliveries and not necessarily all at the same time. Each part of your order may be shipped separately.

To avoid any delays or complications, we strongly advise against booking or beginning any roofing work until your entire order has been delivered and checked.

Important Delivery Information

To ensure smooth delivery, please inform us of any access restrictions at your delivery location, such as weight limits, height barriers, or parking constraints. Failure to do so may result in delayed or cancelled deliveries and could incur additional charges.

All deliveries are kerbside only, to firm, level ground, and are made at the driver's discretion.

Collection from Our Depot

We hold limited stock of certain items at our depot, including:

3.05m, 4.58m, and 6.1m rolls of EPDM (1.2mm thickness)

A selection of trims, tapes, and adhesives

If you would like to collect your order in person, we kindly request that you contact us first for a quotation before ordering online. You’re also very welcome to visit us at the depot to discuss your requirements.

Please note that prices may vary instore compared to online.

FAQ's