To understand what makes a valley either closed or open it is important to understand how a valley is constructed.
Roof valley flashing detail.
That flashing is left exposed so the roof has visible lines of metal running down the valley.
W type valley flashing is more rigid for handling so it stays straight and it stops waler rushing down one side of a roof from rushing back up the other side.
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.
Overview w valley flashing protects the critical area of your roof where two slopes come together to form a valley.
Riverside provides roof valley flashing for general contractors roofers and do it yourself home owners.
Cut bottom of flashing so the entire width of the valley flashing extends approximately 1 2 to 3 4 over the fascia trim board along eaves the following photos illustrate removal and replacement of a closed cut valley with new open metal valley.
One of the details that varies between homes is the method of flashing the valley areas of the roof.
Extend entire width of flashing completely to the bottom of the roof valley.
Flashing against a vertical sidewall shall be by the step flashing method.
Special pricing available for large quantities.
The installer fabricates simple clips or valley flashing cleats whose bent edge interlocks with the folded over or hemmed edges of the metal roof valley flashing to secure the valley to the roof deck.
Details roofing wrb flashing storm proof roof 2.
There are two common methods for completing the flashing of a valley in a shingle roof system.
Cut the bottom edge and fold it down over the drip edge.
When properly installed w valley flashing will reliably channel run off water down the roof and into the gutter.
Using clips permits movement in the valley as temperatures change.
Use roof valley cleats at intervals of 24 o c.
Edge flashing and starter strip roofs peel off from the edges so it is critical to hold them tight with the roof deck sealed on the outside we turn to flashing the edges with metal and membranes metal drip edge flashing details roofing wrb flashing.
Make sure to cover the gap at the bottom of the raised ridge to keep bugs and ice out.
The flashing shall be a minimum of 4 inches 102 mm high and 4 inches 102 mm wide.
Closed valley s or open valleys.
Be sure to check local building codes to ensure you have the proper width for your application.
Valley flashings are custom fabricated to any measurements and angles and usually measure 10 in length but can also be we can also match any profile.
