Proper Roof Flashing Techniques

Use fasteners that are compatible with or of the same type of metal as the flashing material.

Proper roof flashing techniques.

Apply an approximately 3 inch width of asphalt roofing cement along the sides of flashing and embed shingles in mastic. Proper roof installation is achieved through experience and sound construction techniques thorough. Install an underlayment centered in the roof valley. Lap successive sheets of metal flashing a minimum of 12 inches and seal laps.

Half the vents should be at the eaves and half at the ridge. Then install a non corrosive metal valley flashing of 24 minimum width. While some skylight manufacturers include flashing in their products sometimes roofing professionals. Roof and deck flashing recommendations for coastal areas always lap flashing and other moisture barriers properly.

Beyond the dormer and cut the top section along the dormer edge. Begins with the proper selection of the roof system for that particular environment there are other important factors to consider such as the roof covering deck ends underlayment flashing and other components. 1 square foot per 150 square feet of attic floor. It s much easier to reseal the flashing than it is to patch a water stained wall or ceiling.

Flashing seals areas of transition or penetration where architectural features exterior electrical features plumbing or the roof and walls meet. Storm proof roof 2. The edge of the roof has thin metal flashing that helps water drip off. Proper roof wall flashing example to install the roof wall flashing above the builder bent the top edge of the flashing into a 90 degree lip about 2 cm in width.

The 8 inch height prevents water from pouring over the top of the flashings into the building or system. Open valleys have metal flashing to protect this critical area of the roof. This height has become the industry standard and is recognized by most membrane manufacturers. Guttering can keep the moisture away from the sheathing.

Recaulk the joints between the roof and the flashing. Use increased lap lengths for added protection. Run the base flashing 4 to 5 in. Bend the flap down and nail along the top edge.

The first bending two pieces and caulking the joint photos 1 3 is the most common because you can do it on the spot with the flashing at hand. Fasten loose nails and cover exposed nail heads with roofing cement. Do not rely on sealant as a substitute for proper lapping. Edge flashing and starter strip roofs peel off from the edges so it is critical to hold them tight with the roof deck sealed on the outside we turn to flashing the edges with metal and membranes metal drip edge flashing details roofing wrb flashing two ways to flash roof edges.

Vertical flashings must be a minimum of 8 inches above the completed roof surface.