Roof Flashing Construction Methods

Recaulk the joints between the roof and the flashing.

Roof flashing construction methods.

Protect the eave from ice dams and sideways rain step one in steep slope roofing is the edge flashing. This drip edge flashing provides protection from water damage along the eaves and rake of a roof. Flashing insures water running down the siding doesn t come into contact with the sill which provides support for your homes framework. There are two common methods for completing the flashing of a valley in a shingle roof system.

Fasten loose nails and cover exposed nail heads with roofing cement. Gibraltar drip edge flashing can be used with asphalt shingles or metal roofing panels. Take care not to place any fasteners in the exposed center area of the metal flashing. Factors to consider such as the roof covering deck ends underlayment flashing and other components.

23 roof to wall and deck to wall flashing home builder s guide to coastal construction page 1 of 3 purpose. One common method is to lay the edge metal under the eaves membrane and over the rake. Two ways to flash roof edges. Roof to wall and deck to wall flashing www fema gov technical fact sheet no.

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. Decks are commonly attached to a house using a ledger board. Details concrete masonry roofing wrb flashing. Closed valleys or open valleys.

The extra kick at the bottom of the face directs run off away from the structure. As the deck interrupts the flow of water from above flashing that channels water around the ledger board is critical. 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. One of the details that varies between homes is the method of flashing the valley areas of the roof.

Proper roof installation is achieved through experience and sound construction techniques thorough inspections and compliance with code requirements standards and manufacturer recommendations. The edge of the roof has thin metal flashing that helps water drip off. Renew flashing seals by chipping out old caulking and mortar along the edges of the flashing. Open valleys have metal flashing to protect this critical area of the roof.

To understand what makes a valley either closed or open it is important to understand how a valley is constructed.