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Guarantee Requests

Permavent are so confident in the quality and efficacy of our products that we offer extensive warranties on installations that include them subject to our qualifying criteria and terms & conditions.

Permavent are pleased to offer a 25-year Diamond GRP guarantee, a 40-year Easy Roof System guarantee and the newly launched 20 year System Guarantee.

Please see below for eligibility criteria and apply for your guarantee using the form below.

Guarantee Criteria

20 Year System Guarantee

Permavent offer a 20 year guarantee on its range of pitched roof ventilation products, complementing the ventilation requirements of BS5250:2021, which includes the use of in-roof solar PV panel ventilation in new build, refurbishment and aftermarket projects.

The following must be used to qualify for the 20 year system guarantee:

LR Membrane

Cold roof with integrated solar panels – The Permavent LR membrane must be used in conjunction with high and low level ventilation products and underlay support tray.

Cold roof – If you do not have an airtight ceiling, Permavent LR membrane must be used in conjunction with high and low level ventilation products and underlay support tray.

Warm roof with integrated solar panels – Roof must be counter battened directly on top of the Permavent LR membrane, Permavent 25mm over fascia vents to ventilate the batten cavity, support tray and Permavent universal dry ridge.

Warm roof – Roof must be counter battened directly on top of the Permavent LR membrane, underlay support trays to be used at the eaves and Permavent universal dry ridge (if required).

APEX Membrane

Cold roof with integrated solar panels – The Permavent APEX membrane must be used in conjunction with Permavent 10mm over fascia vents, Permavent underlay support trays and Permavent universal dry ridge system.

Cold roof – Permavent APEX along with Permavent underlay support tray and Permavent universal dry ridge system.

Warm roof with integrated solar panels – Roof must be counter battened directly on top of the Permavent APEX, Permavent 25mm over fascia vents to ventilate the batten cavity, support tray and Permavent universal dry ridge system.

Warm roof – Permavent APEX along with Permavent underlay support tray and Permavent universal dry ridge system (if required).

Guarantee applications must be submitted no later than 1 month after project completion

Easy Roof System 40 Year Guarantee

We are so confident that our products are of the highest quality that we offer a 40-year product guarantee against the weatherproofing integrity of the roof structure, providing the following criteria is met:

  • The installation must be installed as per the manufacturer’s instructions and in accordance with BS5534:2014 + A2:2018
  • The specified membrane must be PERMAVENT DRY+
  • The specified tape must be PERMAVENT BUTYL TAPE
  • The contractor must record both in-progress and completed project images to be supplied alongside invoices at the time of guarantee application
  • Guarantee applications must be submitted no later than 1 month after project completion

Please note each Easy Roof installation requires its own submission

40 Year Guarantee Label Design

Diamond GRP 25 Year Guarantee

Diamond GRP is provided with a 25-year guarantee on materials for the end user. To qualify, Diamond GRP must have been installed per the manufacturers instructions and following relevant British Standards and guidelines for eligibility:

  • The installation must be installed as per the manufacturer’s instructions and in accordance with the relevant British Standards
  • The contractor must record both in-progress and completed project images to be supplied alongside invoices at time of guarantee application
  • Guarantee applications must be submitted no later than 1 month after project completion

Please note each Diamond GRP installation requires its own submission

Diamond GRP - 25 year Guarantee Logo Design

Submit a Guarantee Request

Please submit one form per address if submitting multiple sites

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Contractor Address(Required)
Date of completed works(Required)
Please note, we cannot accept guarantee requests more than one month after works have been completed.
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Please note, we cannot accept guarantee requests more than one month after works have been completed.
Site Owner's Name(Required)
Installation Address(Required)
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Photographs of the project during and after installation of the product, and before if possible.
Drop files here or
Accepted file types: jpg, png, gif, pdf, Max. file size: 9 MB.
    Are you happy for us to submit this project for a case study or award submission?(Required)
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    Before you begin:

    If you are unsure about your projects’ eligibility for the Permavent guarantee, please don’t hesitate to get in touch with the Permavent Technical Team by visiting the contact us page.

    Please ensure you have available copies of purchase invoices (can include photocopies or photographs provided information is clear and legible).

    Please ensure you have photographs of the project during and after installation of the product, and before installation if possible.

    What happens next?

    A representative of the Permavent Technical Team will contact you within 5 day to discuss your installation and request further information. Please note you will be required to provide copies of purchase invoices for guarantee verification.

    The applications will be reviewed and if approved your certificates will be issued via email in 7 to 10 working days from the date of approval.

    If you have any questions, please don’t hesitate to get in touch.