What is a flashing detail?

Flashing is a sheet of thin, impervious material used to prevent water penetration or seepage into a building and to direct the flow of moisture in walls. There are two categories of flashing, exposed and embedded.

Should flashing be exposed?

The flashing should be partially exposed along the wall. Since you can see step flashing, some homeowners choose a more expensive flashing material like copper to achieve a certain aesthetic.

What is the difference between capping and flashing?

APRON FLASHING – A one piece flashing, such as is used at the lower side of a chimney that penetrates a sloping roof. CAPPING – A covering fixed to the top of a parapet wall or the edge of roofing forming a waterproof seal.

What is a verge flashing?

Verge flashing is the projection of the roof boards or battens of a building the roof faces of which are bordered by verge lines.

Does flashing go over or under house wrap?

The house wrap has to be flashed properly to keep the water moving down and out, not down and in. That means you want the upper layers to come down over the top of the lower layers.

What is flashing on a window?

Window flashing is a thin continuous piece of material that is installed to prevent water from getting into a structure from an angle or joint near windows. Wall flashing is typically found around windows and doors.

Does flashing go over or under shingles?

Flashing should overlap the roof-covering material, but on asphalt shingle roofs, for aesthetic reasons, the part of the headwall flashing that extends down over asphalt shingles is often covered with a course of shingle tabs.

What does cap flashing look like?

Cap flashing: An L shaped structure that lies flat against the roof and other fittings such as windows. The shape of the structure runs water off in the opposite direction. This prevents it from pooling in any cracks around the fitting.

What is a cap flashing?

Counter-flashing (or cover flashing, cap flashing) is a term used when there are two parallel pieces of flashing employed together such as on a chimney, where the counter-flashing is built into the chimney and overlaps a replaceable piece of base flashing.

Is Dry Verge better than mortar?

The most obvious advantage is durability, the plastic verge caps should last you a minimum of 10 years and require very little maintenance in comparison with sand/cement mortar. In effect you won’t need to worry about your roof leaking in or any pesky birds, bees or wasps nesting in your roof!

Does flashing go over or under Tyvek?

Lap Tyvek® WRB over all flashing (e.g. step flashing, wall to roof intersections and through wall flashings). Weep screeds and expansion joints need to be integrated with flashings and the Tyvek® WRB.

What do you need to know about flashing on a window?

The flange must be sealed to the surrounding walls and flashed to shed water. The flashing needs to be integrated properly with the house wrap and siding for the system to work properly. There is still some debate about the best way to flash this type of window, and most window manufacturers publish their own detail.

How do you waterproof flashing on a window?

For best protection, add a metal drip cap at the top of the window, caulked directly to sheathing. The key to success with any flashing detail is to follow the shingle principle, with upper layers of waterproofing materials overlapping lower layers, shedding water to the building exterior.

Where does the jamb flashing go on a window sill?

Jamb flashing. Jamb flashing should extend beyond the lower and outer edges of the pan flashing, and above the head flange but at least 1 in. below the top of the head flashing. Drip cap. If the top of the window/door unit does not slope toward the exterior or have a pronounced drip edge, install a metal or vinyl

How do you seal cap flashing on a window?

Window Cap Flashing. Before sealing up the top of the window, I prefer to install a traditional metal cap flashing. This helps direct water out away from window. In this type of installation, seal the cap flashing directly to the sheathing with high-quality sealant.