Custom Metal Valleys & Custom Metal Flashing

What is a valley?

 A “valley” is a seam that occurs where two planes of the roof meet each other. Typically, valleys are exposed to a much larger volume of rain and snow than the other shingled areas of the roof. This is due to both planes of the roof spilling down the valley. Because a valley takes a lot of abuse relative to the rest of the roof, they’re treated in a special way.

How are valleys treated?

There are two methods to treat a valley, and both begin with the extensive use of ice and water shield. One method is a “closed, shingled valley” which involves shingling the two roof planes in an overlapping pattern. The other is to install what is called a “metal valley”.

What is a metal valley?

 A metal valley is a wide piece of flashing that has a channel bent into the center to facilitate water run-off. The roof is extensively lined with ice and water shield, the metal valley is installed, and then the shingles are placed over the metal valley to within a couple of inches of the water channel. The part you see in an installed metal valley is just the water channel – most of the metal valley is actually covered with shingles.

Why are metal valleys better than shingled valleys?

Often, shingled valleys wear out faster than the rest of the shingled roof. The large volume of water, ice, and snow washes away the shingle’s granules (the mineral “rocks” embedded in the asphalt shingle). Because the granules aren’t there to protect the shingle from the sun’s UV rays, the decay of the shingle is greatly accelerated, often causing it to curl dramatically. Once curling begins, it’s just a matter of time before the shingle fails completely and starts leaking. Depending on the slope of the roof and the skill level of the installer, the shingled valley could be “washed-out” in as few as eight years after installation. We’ve seen many of our competitors’ shingled valleys fail and require a roof replacement when the rest of the roof still had years of life left in it.

Are the metal valleys painted? Will they match the rest of my metal work?

At HomeTown Roofing, we only use metal valleys with baked-on enamel paint, and the color options are the same as the drip edge we use: extensive! You can rest assured that the valley will look beautiful while performing as well as the rest of the roof, without premature degradation and leaks that are common to closed, shingled valleys. The metal valleys are aesthetically superior to shingled valleys, with striking, clean lines. Metal valleys are installed to match the existing flashing and drip edge, which ties the different components of the roof together into a cohesive, thoughtful design.

What is Metal Flashing?

Flashing refers to thin pieces of impervious material installed to prevent the passage of water into a structure from a joint or as part of a weather resistant barrier (WRB) system. In modern buildings, flashing is intended to decrease water penetration at objects such as chimneys, vent pipes, walls, windows and door openings to make buildings more durable and to reduce indoor mold problems. Metal flashing materials include lead, aluminium, copper, stainless steel, zinc alloy, and other materials.

  • We customize each piece of flashing on site for a custom fit every time!