Roof Replacement and
Roof Repair Specialist(703) 475-2446
July 29, 2011 by Roofer911 - 1 Comments
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What is a roof valley anyway? When two roof surfaces meet on the inside corner of an ‘L’ shaped building, where they meet is called the valley. This can be a critical juncture on a roof because double the volume of water is directed at a crack during a storm. Valleys can be built just for utility, or can also be a decorative element.
A valley can be open or closed. An open valley is one where shingles come up to a 'W' shaped piece of valley metal. A closed valley is where shingles are interwoven to form the valley. Shingle manufacturers put instructions on the package wrappers for the methods they recommend in order to maintain the warranty. Some manufacturers have switched wrapper instructions from closed to open valley because few people installed correctly. Closed valleys are sometimes installed with methods called Tamko, Long Island, or California cut, or even woven.
Open valleys use valley metal which comes in colored aluminum or can be copper, which is longer lasting and more expensive. The valley metal can blend or accent your choice of roofing materials. To protect this area, ice and water shield can be installed on top of roof decking. This is a stretchy, sticky underlayment that seals itself against nail holes, and gives with minor structural shifts. Rolled roofing can be laid the length of the valley on top of this before the valley metal. Protecting your roof valley with proper installation prevents water damage in your house.
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