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Innoline Corotherm multiwall Vistalux Technical documents

Roof drainage / Product information

Joining Gutter

The Corodrain Joining Gutter provides a waterproof seal between the adjacent roofs of terraced houses or where a new roof needs to join an existing roof.

More about this product

The gutter can join any combination of slates, double lap or interlocking tiles with minimal disturbance to the adjacent roof. The design ensures there is a minimum kick up of the slates. There is a 50mm wide sanded strip for mortar retention.

  • BBA Approved Cert No. 89/2153
  • 1.8m, 2.4m and 3m lengths
  • At least durable as lead
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Joining Gutter
Joining Gutter · published Ariel image

Published product information

Detail & guidance

BBA Approved Cert No. 89/2153

1.8m, 2.4m and 3m lengths

At least durable as lead

Similar in appearance to lead

Less prone to theft

Quick to install

UV light and acid rain resistant

Smooth surface inhibits the growth of moss & lichen and build-up of debris

Fire resistance to SAB to BS476 part 3 and Class 3 BS476 part 7

ideal for

Providing a waterproof seal between adjacent roofs

Please contact our Technical Department who will be happy to advise on installation instructions.

Joining Gutter HC

Properties

LEAD REPLACEMENT GRP lasts as long as lead, is tougher, cheaper, more resistant to accidental damage, and is less prone to theft or vandalism. Using preformed GRP joining gutter saves significant installation time over traditional methods. Roofers report elimination of many problems with valley troughs when changing from lead to CORODRAIN GRP. Coloured lead grey as standard (other colours available on request). DURABILITY Made with high quality un-filled polyester resin with glass fibre reinforcement for maximum strength. A tough bonded melinex film gives excellent weathering performance. Minimum life of 30 years. MANUFACTURED IN THE UK Manufactured to BS EN ISO 9001:2008 quality standard, at our automated continuous pultrusion plant in Coventry. NO MAINTENANCE The inherent qualities of the materials make the gutters UV light and acid rain resistant, and the smooth surface finish inhibits the growth of moss, lichen and the build up of debris.

Supporting resources

Documents for this range

Linked in the published catalogue

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Product & project support

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Source & review information

Content imported from Ariel’s published product information, captured 27 October 2026. Final technical/content approval is pending; current stock, delivery and warranty assurances are not asserted. Source reference (opens a new tab) ↗