Be sure to check local building codes to ensure you have the proper width for your application.
Valley on a metal roof.
Why is a metal valley important while there are a number of materials that can be used in roof valleys metal provides the most durable longest lasting solution.
W valley flashing protects the critical area of your roof where two slopes come together to form a valley.
Some homeowners do not like the look of open valleys while others feel the metal accentuates the roof s shape particularly if copper or painted flashing is used.
Valleys are a very important part of a well designed roofing system.
Fasteners placed in the exposed center area.
No sales pitch or other fluff.
How to seal metal roof valley.
For an open valley a sheet of metal usually steel sometimes copper is fastened to the roof deck.
Whether for slate shingle or metal roofing valley flashing adds detail and helps to direct water.
With a clean valley you can lay down some peel and stick roofing membrane.
Avoid the following common errors.
Roofing shingles are installed then cut and sealed where they overlap the metal channel.
Punctures in the center of the valley.
Low slope roofs slope less than 3 12 use tape sealant between the valley trim and the panel.
That flashing is left exposed so the roof has visible lines of metal running down the valley.
This will reduce the installed cost of the project.
The metal is usually pre painted to best complement the shingles color blend.
Contractors may be able to reduce the cost of materials on roofing projects by eliminating the metal being installed in the valleys.
An open valley relies on metal flashing for protection.
Best practices for sealing the metal roof valley vary based on the slope of the roof.
Use fasteners to attach the panel to the structure making sure that there is complete compression of the sealant.
Roof mastic applied along sides of valley flashing.
The metal valley is installed on top of the ice and water shield and creates a highly effective barrier and passageway to keep your roof dry and protected.
Failure to extend the entire width of the metal valley flashing beyond the eave of the roof.
Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing.
Closed cut valley fully replaced with new metal valley flashing.
These items can be fabricated in many different profiles.
Fold the top over the roof ridge and cut the bottom along the drip edge metal.
When properly installed w valley flashing will reliably channel run off water down the roof and into the gutter.
