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HD Sharman Ltd.
High Peak Works,
High Peak,
Derbyshire SK23 0HW

Certification & guarantees

Extensive testing guarantees our systems

Our unique scope of certifications underpins our market leadership within the gutter and roofing refurbishment sector. Independently tested against leading rigorous industry standards, the systems have been specifically designed for the gutter and roof environments.

Contractor support…making your project flow

We provide contractors with a choice of support and guarantees. As standard, a 25 year product guarantee is available to Trained Contractors installing the Plygene Gutterline system. In addition, we also offer Trained Contractors a 25 year single point guarantee (covering both materials and installation) with full project management support.


Gutter refurbishment – the Plygene® Gutterline system

Plygene® Gutterline’s unique scope of third party certification underpins its market leadership within the roofing sector. Independently tested against leading rigorous industry standards, the system has been specifically designed for the gutter environment to prevent leaks for good.

BBA certified

Within the UK roofing industry, Plygene Gutterline is the only commercial lining system accredited by the BBA for the gutter environment. Onerous testing in the areas dimensional stability, tear strength, tensile strength, elongation, heat resistance and low temperature flexibility make Plygene Gutterline the first choice for both specifiers and contractors alike.

Guaranteed for 25 years

Engineered to meet the many challenges of the UK gutter environment, Plygene Gutterline’s bespoke non-bonded and non-jointed system design provides a market leading minimum 25 year system product guarantee.

UV certification

Independent accelerated outdoor ultra violet (U.V.) testing by Q-Labs in the arduous sub tropical high intensity sunlight of southern Florida have been ongoing since May 1997 and provide an equivalent U.K. U.V. certification of 39 years……and rising.

BBA certificate and guarantees

BBA certificate
Format: pdf

Function: This certificate relates to Gutterline, a watertight thermoplastic membrane system for lining existing gutters

25 year guarantee certificate
Format: pdf

This is a specimen 25 year guarantee certificate.

Single point guarantee
Format: pdf

Plygene Gutterline system specimen 25 year guarantee certificate.

Roof refurbishment systems

Our systems have been tried and tested for 20 years, offering complete peace of mind and guaranteed performance.

Cut edge corrosion

Seamsil system is guaranteed for 15 years,

Architectural roof coatings

Delcote system is guaranteed for 20 years.

Rooflight coatings

Delglaze system is guaranteed for 10 years.


Delcote Guarantee
Format: pdf

Architectural Coatings 20 year guarantee

Delglaze Guarantee
Format: pdf

Rooflight Coatings 10 year guarantee

Seamsil Guarantee
Format: pdf

Cut Edge Corrosion system 15 year guarantee

Site surveys and technical support

From site survey, condition reports and specification generation through to installation, inspection and guarantee, we support you all the way. Read more…

Book a training course

We run regular training courses at our purpose built training centres in Derbyshire and Wiltshire.

Become a trained contractor

Learn how you can join our Trained Contractor Network.