Our range of open valley troughs are suitable for roof pitch differentials up to 15o

Standard Open Valley Trough for Tile Roofs

The open valley trough range provides drainage channels at the roof valleys. These traditional, pre-formed GRP troughs are perfectly safe to use when wanting to collect rainwater runoff. Designed with a greater capacity, they are a lightweight and cost effective alternative to lead. Being manufactured from GRP, the valley troughs have the following benefits;

  • Up to half the cost and time of traditional lead installation
  • Semi-skilled fitting procedure
  • Light in weight and easy to handle
  • 30 year service life guarantee
  • Do not streak or stain
  • No value to the thief
  • Contains recycled glass

Product Codes

HDL 401 and HDL 402

Application of the Open Valley Trough

The HDL 401 and HDL 402 are suitable for tile roofs.  They are for ‘standard’ application compliant with NFRC Technical Bulletin 28.

Find Hambleside Danelaw’s open valleys at a stockist.


Open Valley Troughs Datasheet
BBA 87 1915 Certificate GRP Flashing – Valley Tiled
HDL 401 and 402 Drawing
HDL 401 and 402
Danelaw Lead Replacement Products Brochure Oct19
  • Product code
    HDL 401 and HDL 402
  • Colour
  • Made from
  • Length
    3000mm or 2400mm
  • Width
  • Additional Links
  • NBS Product Spec XML