Metal Roof Valley Flashing Detail

Use roof valley cleats at intervals of 24 o c.

Metal roof valley flashing detail. The cant strip can also be constructed as shown in detail 9 5d the shingles or slate must lap the flashing at least 6. Properly sized and installed valley flashing is key to channeling water safely off the roof. Wear soft soled shoes to improve traction and to minimize damage to the paint finish. Valley flashing is metal or sometimes peel and stick material that protects an important area on the 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. Avoid the following common errors. Multiply the length by 1 1 2 for a steep roof and by 1 1 4 for a non steep roof. The detail shows a typical open valley flashing for a shingle or slate roof.

Punctures in the center of the valley. These are v or w shaped flashings prepared commercially. Closed cut valley fully replaced with new metal valley flashing. Two different cants are illustrated.

Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing. Failure to extend the entire width of the metal valley flashing beyond the eave of the roof. Step 4 purchase the 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. Calculate the amount of flashing that you will need this can be done easily by measuring the length of the valleys that you will flash. Always be aware of your position on the roof relative to any roof openings roof edges co workers and penetrations. 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.

When installing metal valley flashing there are a few things to keep in mind from cutting metal roofing to sealing the flashing. Metal valley trim also known as metal valley flashing is beneficial because it drains water away from the structure of your metal building which helps prevent moisture damage. Fasteners placed in the exposed center area.