When there is damage in the valley, with all the excessive water rushing down the valley, it can cause wood to rot at a quicker pace than other parts of the roof. It’s quite common to need wood replaced when it comes to fixing a leak in the valley.
There are multiple types of valley flashing. Manufacturers and building codes regulate what method is best for your area. On a shingle roof, you can have the shingles installed in the valley in four different ways. Although the open valley with exposed metal is not proper for the Fort Lauderdale area.
Cover the edges in reinforced polyester fabric and roof cement and lastly, lay the shingles. The shingle can be installed in a woven pattern or a “closed cut” method. If you do need to replace the plywood, make sure that the new piece spans the distance of three trusses. Be sure to inspect the trusses for wood rot as well.
Tile roofs always require metal, lead or copper to be installed in the valley, and from the ground, you will see the metal exposed. You always want Ice and Water Shield to be installed in the valleys and at the eaves. This will add the extra protection needed in these areas of high amounts of water draining off the roof.