Valleys - Calgary Roofing
In the same way water runs along the valleys between two mountains, water runs along the valleys on your roof peaks. Valleys generally receive the highest concentration of water flowing through them, therefore installing them correctly is extremely important!
Having leak barriers installed under valleys is a requirement by the Alberta Building Code.
A word of caution: Many roofing contractors install valleys in a style referred to as 'closed'. A closed valley consists of shingles woven inside the valley, as opposed to an 'open' valley which has sheet metal running from top to bottom. Both the open and the closed styles of installation are acceptable by the Alberta Building Code and by most manufacturers, however the open style installation has consistently out-performed the closed style, and costs exactly the same price to install. Asking your contractor to use the open style of installation for could save you from having to replace your roof system prematurely and avoid headaches in the long run.
Typically, an open valley is installed with a 30 gauge sheet metal, 4' wide, coming in 10' sheets. This metal can be ordered in any color to match the shingles on your roof system.