What is a valley?

A roof valley is formed where two roof slopes meet. Water collects in a valley to flow off the roof. Your choice of valley installation method is critical because, when improperly installed, valleys are risks for serious leaks. The valley itself acts as a waterproofing system when installed properly and DOES NOT require additional waterproofing!

Valleys and waterproofing

It is a common error that valleys are waterproofed using the following methods:

  • cement
  • liquid rubber products
  • foam
  • membrane waterproofing systems

This may not be done under any circumstances and does not meet South African National Standards for roofing!

incorrect valleys

The Professional Roof Repair and Waterproofing Association does not wish to discourage contractor's but rather to educate, up-skill and uplift. Should you need advice on how to correctly navigate a valley please email us and we will happily assist.