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Material Uses
Ideal for
- Slate and Tiled Roofs
- Joining To Existing Roofs
- An Abutment Soaker
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Key Properties
The Corodrain range of valley troughs are manufacured in
GRP as an economic and durable alternative to using lead.
They can be used on both slate and tiled roofs and also
provide a weatherproof seal between roofs of terraced houses,
or where a new roof needs to join an existing roof. The
Corodrain abutment soaker produces a weatherproof seal where
the verge of a sloping roof meets a vertical abutment..
- Lasting as long as lead, Corodrain is tougher and cheaper.
- More resistant to accidental damage and theft from site.
- Maintenance free.
- UV light and acid rain resistant.
- Smooth finish inhibits growth of moss or build up of
debris.
- Significant reduction in installation time.
- Excellent weathering performance.
- Manufactured in the UK to quality assurance ISO9000
standard.
Product Brochure
Download our product brochure (PDF File Format). This document requires Adobe reader to view, click here to download.
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| Corodrain
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| Types |
Features |
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D-Valleys |
Standard Corodrain valley troughs for use
with single lap tiles. Both standard(type;HD)
and heavy duty (type:DX). They incoperate sanded
strips (min. width 35mm) for the mortar to bond
to. |
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A-Valleys |
Narrow Corodrain valley troughs for use with
single lap tiles in limited applications. Both
standard (type:HA) and heavy duty (type:AX).
They incorporate sanded strips (min. width 35mm)
for the mortar to bond to. |
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B-Valleys |
Standard Corodrain valley
troughs for use with double lap slates and
tiles, which are dry bedded. Both stardard
(type:HB) and heavy duty (type:BX). |
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Diamond 60 |
Heavy weight type B or D valleys with the
addition of floride based patented surface protection.
Provides complete protection against UV light,
resistant to virtually all chemicals,solvents
and pollutants,temperature range -40º to
+100º. The durability of Diamond 60 has
been recognised as matching code 7 lead by Housing
Association Property Mutual (HAPM). Designed
for very harsh environments or prestige building. |
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Abutment Soaker |
Provides a weatherproof protection between
a sloping roof and a vertical abutment. The
bonded sanded strip gives maximum mortar adhesion,
and the two bars along the horizontal section
prevent moisture entering the roofspace. |
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| Joining Gutter |
Lasting as long as lead, Corodrain is tougher
and cheaper.Gives a weatherproof seal between
adjacent roofs. Joins
any combination of double lap or interlocking
slates, clayor concrete tiles, with minimum
disturbance to the adjacent
roof. The design ensures that the slates don’t
‘kick up’. |
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Unequal Pitches |
B&D- Valleys are designed for use where
the differential between two rafter pitches
is 15º or less. Industry standards recommend
A- valleys should only be used for pitch differences
of 10º or less. |
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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 valley troughs 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 UK
Manufactured to ISO9000 quality standard, our automated continuous
pultrusion plant in Coventry. All available from stock for
rapid delivery to site. |
NO MAINTENANCE
The inherent qualities of the materials make the valleys UV
light and acid rain resistant, and the smooth surface finish
inhibits the growth of moss, lichen and the build up of debris. |
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Roof
area less than 25m² |
Roof area 25
- 100m² |
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Rafter Pitch
(degrees) |
Valley Type |
Max. Vally
Lenght |
Valley Type |
Valley Type
Lenght |
Minimum Lap
Lenght |
| 17.5 to 22 |
B/D |
7.0m |
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350mm |
| 22.5 to 29 |
A/B/D |
7.0m |
B/D |
14.5m |
300m |
| 30 to 34 |
A/B/D |
7.5m |
B/D |
15.0m |
200m |
| 35 to 39 |
A/B/D |
7.5m |
B/D |
15.5m |
200m |
| 40 to 44 |
A/B/D |
8.0m |
B/D |
16.5m |
150m |
| 45 to 49 |
A/B/D |
8.5m |
B/D |
17.0m |
150m |
| 50 to 55 |
B/D |
9.0m |
B/D |
18.5m |
150m |
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| Valley Weights |
Valley Thickness |
| Standard valley troughs (HD, HA, HB) |
1.64kg/m² |
Standard valley throughs (HD,HA,HB) |
1.3mm |
| Heavy weight valley troughs (DX,AX,HB) |
2.10kg/m² |
Heavy weight throughs (DX,AX,BX) |
1.6mm |
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