Harcon Corodrain HB18 Standard B-Type Valley for Slate & Plain Tiles - 1.8m

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Est. Delivery: 5-7 Working Days
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£8.53 Incl. VAT
£7.11 Ex. VAT

Product Description

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 fixes over the batten for fast and simple installation.


Suitable for use on roofs with pitches from 17.5° to 55°.
Can accommodate a maximum difference between two rafter pitches of 15°.
Designed for use with natural slate, manufactured slate and plain tiles.


Length: 1.8m.
Width: 330mm.
Weight: 1.83kg per m2.
Thickness: 1.3mm.
Colour: grey / blue.
Material: GRP - high quality unfilled polyester resin with glass fibre reinforcement.

Valley selection table

  Roof area less than 25m2

   Roof area 25m2 to 100m2  
Rafter Pitch Valley Type Max. Valley Length

Valley Type Max. Valley Length Minimum Lap Length
17.5-22° B / D 7m - - 350mm
22.5-29° A / B / D 7m B / D 14.5m 300mm
30-34° A / B / D 7.5m B / D 15m 200mm
35-39° A / B / D 7.5m B / D 15.5m 200mm
40-44° A / B / D 8m B / D 16.5m 150mm
45-49° A / B / D 8.5m B / D 17m 150mm
50-55° B / D 9m B / D 18.5m 150mm



Width 330mm Length 1800mm Thickness 1.3mm


Colour Grey Blue Minimum Pitch 17.5 Degrees

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Harcon Corodrain HB18 Standard B-Type Valley for Slate & Plain Tiles - 1.8m

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