Preparing the Valley of a Roof for Shingling
Proper preparation goes a long way toward preventing leaks.
There may be several ways to shingle a roof, but when preparing, all the valleys start the same. A most effective material to start with is waterproof shingle underlayment (WSU). These peel-and-stick membranes seal around nails and are easy to work with.
Builder, construction consultant, and contributing editor Mike Guertin demonstrates his method for prepping a valley, solo, on the roof mock-up built to illustrate his article, Four Ways to Shingle a Valley.