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.
Valley flashing on metal roof.
Lay the flashing down in the roof valley and start at the lower end of the roof.
Use roof valley cleats at intervals of 24 o c.
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.
W valley flashing protects the critical area of your roof where two slopes come together to form a valley.
When installing metal valley flashing there are a few things to keep in mind from cutting metal roofing to sealing the flashing.
Attach the flashing panel in place at the bottom.
With a clean valley you can lay down some peel and stick roofing membrane.
Step 6 install the flashing.
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.
Install an underlayment centered in the roof valley.
Apply an approximately 3 inch width of asphalt roofing cement along the sides of flashing and embed shingles in mastic.
Fold the top over the roof ridge and cut the bottom along the drip edge metal.
First clean the debris out of the valley including sawdust nails and whatever else is in there.
How to secure metal roof valley by clips cleats or edge trapping roofing nails.
Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing.
Be sure to check local building codes to ensure you have the proper width for your application.
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.
Galvanized steel aluminum and copper can all be used.
Remember to caulk the underside of the flashing with a sealant.
Use 1 inch galvanized roofing nails.
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.
These items can be fabricated in many different profiles.
Make sure that the end of the flashing panel is perfectly in line with the edge of the roof.
Whether for slate shingle or metal roofing valley flashing adds detail and helps to direct water.
How to cut metal roofing to fit valleys.
As the asphalt shingles are installed over the roof deck the shingles are extended into the valley.
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.
