Roof Flashing Construction Methods

Fasten loose nails and cover exposed nail heads with roofing cement.

Roof flashing construction methods.

To understand what makes a valley either closed or open it is important to understand how a valley is constructed. This drip edge flashing provides protection from water damage along the eaves and rake of a roof. Closed valleys or open valleys. There are two common methods for completing the flashing of a valley in a shingle roof system.

Apply an approximately 3 inch width of asphalt roofing cement along the sides of flashing and embed shingles in mastic clip the top corner of shingles along valleys to keep water flow toward center of valley. Decks are commonly attached to a house using a ledger board. To emphasize the importance of proper roof and deck flashing and to provide typical and enhanced flashing techniques for coastal homes. Gibraltar drip edge flashing can be used with asphalt shingles or metal roofing panels.

The extra kick at the bottom of the face directs run off away from the structure. One common method is to lay the edge metal under the eaves membrane and over the rake. The edge of the roof has thin metal flashing that helps water drip off. 23 roof to wall and deck to wall flashing home builder s guide to coastal construction page 1 of 3 purpose.

As the deck interrupts the flow of water from above flashing that channels water around the ledger board is critical. It s much easier to reseal the flashing than it is to patch a water stained wall or ceiling. Roof to wall and deck to wall flashing www fema gov technical fact sheet no. One of the details that varies between homes is the method of flashing the valley areas of the roof.

Two ways to flash roof edges. Protect the eave from ice dams and sideways rain step one in steep slope roofing is the edge flashing. Recaulk the joints between the roof and the flashing. Flashing insures water running down the siding doesn t come into contact with the sill which provides support for your homes framework.

Before the availability of sheet products for flashing builders used creative methods to minimize water penetration such as angling roof shingles away from the joint placing chimneys at the ridge building steps into the sides of chimneys to throw off water and covering seams between roofing materials with mortar flaunching. Factors to consider such as the roof covering deck ends underlayment flashing and other components. Take care not to place any fasteners in the exposed center area of the metal flashing. Renew flashing seals by chipping out old caulking and mortar along the edges of the flashing.

While some skylight manufacturers include flashing in their products sometimes roofing professionals.