Universal GRP Dry Valley

Advantages

  • Dry fix, mortar free system
  • Durable GRP technology
  • Simple and fast installation
  • Can accommodate up to a 20° pitch variance either side of the valley
  • Performs on pitches up to 60°
  • Gives a finished appearance of a close cut roof
Valleys are one of the most vulnerable parts of the roof. Marley Universal GRP dry valleys provide totally weathertight detailing that are fast and easy to install and compatible with all Marley concrete, clay plain and interlocking tiles.

Function & Compatibility

  • Provides weathertight ventilation in the roof slope
  • Provides up to 10,000mm2 free area of ventilation
  • For natural, mechanical or soil pipe ventilation
  • For use with all concrete plain and interlocking tiles
Technical Data

Accommodates up to a 20° pitch variation either side of the valley

Continuous support for the valley through must be provided using ply boards

Rafter pitch

Max. valley length

Min. lap length

15 to 17°

10.0m

400mm

17.5 to 22.5°

12.0m

350mm

22.5 to 29°

14.5m

300mm

30 to 34°

15.0m

250mm

35 to 39°

15.5m

200mm

40 to 44°

16.5m

150mm

45 to 49°

17.5m

150mm

50 to 55°

18.5m

150mm

 

This table is a guide to the recommended application criteria. It assumes a standard roof intersection of 90° and a roof drainage area of 100m². For applications other than this, specific advice should be sought from our technical department.


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