Roof Valley Flashing Detail

Closed valley s or open valleys.

Roof valley flashing detail.

At the end of the vertical sidewall the step flashing shall be turned out in a manner that directs water away from the wall and onto the roof and or gutter. 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. Flashing against a vertical sidewall shall be by the step flashing method. Details roofing wrb flashing storm proof roof 2.

Riverside provides roof valley flashing for general contractors roofers and do it yourself home owners. Cad details document name pdf dwg download all cad construction details 37 1 mb 3 4 mb mc01 identification of roof areas 694 kb 167 kb mc01a single layer underlayment 678 kb 302 kb mc01b double layer underlayment 711 kb 322 kb mc02 vent pipe flashing 626 kb 349 kb mc03 valley. Extend entire width of flashing completely to the bottom of the roof valley. Special pricing available for large quantities.

One of the details that varies between homes is the method of flashing the valley areas of the roof. An open valley relies on metal flashing for protection. When properly installed w valley flashing will reliably channel run off water down the roof and into the gutter. There are two common methods for completing the flashing of a valley in a shingle roof system.

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. To understand what makes a valley either closed or open it is important to understand how a valley is constructed. Use roof valley cleats at intervals of 24 o c. The flashing shall be a minimum of 4 inches 102 mm high and 4 inches 102 mm wide.

Overview w valley flashing protects the critical area of your roof where two slopes come together to form a valley. 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. That flashing is left exposed so the roof has visible lines of metal running down the valley. Cut the bottom edge and fold it down over the drip edge.

Be sure to check local building codes to ensure you have the proper width for your application. 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. Using clips permits movement in the valley as temperatures change.