Valley Flashing On Metal Roof

Be sure to check local building codes to ensure you have the proper width for your application.

Valley flashing on metal roof. Lay the flashing down in the roof valley and start at the lower end of the roof. Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing. How to cut metal roofing to fit valleys. First clean the debris out of the valley including sawdust nails and whatever else is in there.

Galvanized steel aluminum and copper can all be used. Step 6 install the flashing. W valley flashing protects the critical area of your roof where two slopes come together to form a valley. These items can be fabricated in many different profiles.

Use 1 inch galvanized roofing nails. Make sure that the end of the flashing panel is perfectly in line with the edge of the roof. Install valley battens on both ends of the roof valley then attach first flashing 3 4 inches over the roof flange and another 3 4 inches over the fascia if any is present. Attach the flashing panel in place at the bottom.

Then install a non corrosive metal valley flashing of 24 minimum width lap successive sheets of metal flashing a minimum of 12 inches and seal laps. 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. As the asphalt shingles are installed over the roof deck the shingles are extended into the valley. With a clean valley you can lay down some peel and stick roofing membrane.

How to secure metal roof valley by clips cleats or edge trapping roofing nails. This valley flashing material can be manufactured from any metal that will resist the effects of weather acid rain and other contaminants. Whether for slate shingle or metal roofing valley flashing adds detail and helps to direct water. 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. For example in metal roofing systems valleys are commonly fabricated with hems but can also be fabricated without them in which case they could still be used for metal roofing or any other type of roofing. Drip edge metal valley flashing dormer chimney and kickout flashing are types of roof flashing that shed water away from the connections between roofs walls chimneys and other building assemblies. Install an underlayment centered in the roof valley.

Remember to caulk the underside of the flashing with a sealant. 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. Apply an approximately 3 inch width of asphalt roofing cement along the sides of flashing and embed shingles in mastic.