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:
- liquid rubber products
- membrane waterproofing systems
This may not be done under any circumstances and does not meet South African National Standards for roofing!