Roof drainage
A Type Universal Valley Trough
The Corodrain A Type Valley Trough is a narrow valley trough for use with single lap tiles in limited applications. There is a standard (type:HA) and heavy duty (type:AX) option…
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Corodrain Valley Troughs
The Corodrain range of BBA approved valley troughs are manufactured in GRP as an economic and durable alternative to using lead and all conform to NFRC Technical Bulletin 28.
More about this range
Corodrain valley troughs can be used on both slate and tiled roofs and with any combination of double or interlocking slates, clay or concrete tiles. Corodrain can also provide a weatherproof seal between roofs of terraced houses or where a new roof needs to join an existing roof. Options include A, B, D and E valleys and also the Diamond 60 range of D and B valleys with enhanced durability which has been recognised as matching code 7 lead.
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Roof drainage
B Type Valley Trough
The Corodrain B Type Valley Trough is for use with double lap slates and tiles, which are dry bedded. There is a standard (type:HB) and heavy duty (type:BX) option. The valley f…
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Roof drainage
D Type Universal Valley Trough
The Corodrain D Type Universal Valley Trough is a narrow valley trough for use with single lap tiles in limited applications. There is a standard (type:HD) and heavy duty (type:…
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Roof drainage
E Type Universal Valley Trough
The Corodrain E Type Universal Valley Trough is a narrow valley trough for use with single lap tiles in limited applications. There is a standard (type:HE) option. The valleys i…
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Roof drainage
Diamond 60 B Type Slate Valley
Heavy weight Type B valley with the addition of floride based patented surface protection. Provides complete protection against UV light, resistant to virtually all chemicals,so…
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Roof drainage
Diamond 60 D Type Universal Valley
Heavy weight Type D Universal Valley with the addition of floride based patented surface protection. Provides complete protection against UV light, resistant to virtually all ch…
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Documents for this range
Ariel Product GuideMar2026 (PDF, opens a new tab)
PDF · discovered on the published product page. File version and current applicability require confirmation.
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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) ↗