Metal Roof Valley Flashing Detail

These items can be fabricated in many different profiles.

Metal roof valley flashing detail.

Failure to extend the entire width of the metal valley flashing beyond the eave of the roof. Closed cut valley fully replaced with new metal valley flashing. 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. Roof mastic applied along sides of valley flashing.

Since this was an introductory guide to the basics of standing seam metal roof installations we purposefully left out more technical details such as z bar flashing end wall and valley flashing details however they are covered in the video above if you like to learn more about the components that go beyond the basics. The top joinery of both valleys when they meet on the same plane of roof is shown here. Valleys are a very important part of a well designed roofing system. Avoid the following common errors.

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. Fasteners placed in the exposed center area. 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. Whether for slate shingle or metal roofing valley flashing adds detail and helps to direct water.

Open valleys have metal flashing to protect this critical area of the roof. While some skylight manufacturers include flashing in their products sometimes roofing professionals have to create it or purchase it separately. To understand what makes a valley either closed or open it is important to understand how a valley is constructed. How to secure metal roof valley by clips cleats or edge trapping roofing nails.

The edge of the roof has thin metal flashing that helps water drip off the roof without damaging the home or causing a leak. I have my valley custom made with water trough to help with leaking b. Punctures in the center of the valley. Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing.

Closed valleys or open valleys. Use roof valley cleats at intervals of 24 o c.