Four Different Styles Of Valleys To Install With Asphalt Shingles And Preventing Leaks

Posted on: 26 January 2015

If you have a roof with valleys in the design, this can be an area that is prone to leaks in your home. There are different types of styles of installation, which can be woven, straight cut, open valley or Long Island Valley (also called California Valley). These can also be combined with things like straight cuts with woven eaves. These different style valleys are not ideal for all asphalt shingles, and need to be done properly to protect from leaks. If you are having a new roof installed on your home, here are four things you will want to know about these different valley styles:

1. Using The Best Materials To Protect From Leaks In Open Valleys

An open valley is where the shingles are cut several inches back from the roof valley. This is commonly done with an asphalt roofing membrane to protect the valley from leaks. It is a better idea to use a metal valley or metal flashing beneath the membrane to protect from leaks. This is because the roofing membrane will where faster than tabbed asphalt shingles when used on the valley of a shingle roof.

2. Woven Valleys, Flashing And The Right Type Of Shingles

Woven valleys are where the shingles appear to be woven into the valleys of the roof. This type of valley installation is prone to leaks and should be done with architectural shingles. If you want to have this type of valley done, it is a good idea to have valley flashing installed to prevent leaks. There are rubber membranes that can be installed in the valley to give your further protection from water leaks if you have a woven valley style installation on your roof.  You may want to ask the roofer about installing a metal flashing and the rubber membrane to minimize the potential for leaks with this type of installation.

3. Proper Installation Of The Common Straight Cut Valley

The straight cut valley is one of the most common types of valley styles for asphalt shingles. It is where the shingles on either side of the valley are cut in a straight line down the slope of the valley. This type of valley should at least have a metal flashing product installed under it. You may also want to talk to the roofer about installing a membrane here too, which will help reduce the chance of leaks, especially on roofs that are not steep.

4. Long Island Or California Valley And Proper Roofing Installation

The Long Island (East Coast) or California (West Coast) style valley is a valley where one side of the valley has shingles that run underneath the adjacent shingles. This type of valley should also have flashing, and is ideal for use with architectural shingles. As long as it is properly flashed, you should not have any problems with leaks and will have an attractive style of valley installed on your home.

These are some of the different styles of roofing valleys that you can have installed on your home. Some of these perform better than others and may only be ideal for certain types of roofing products. If you want to have one of these types of valleys installed on your roof, contact a roofing contractor (such as one from Roof Tech) and ask if it can be done.