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#How to install z flashing over a door install
#How to install z flashing over a door windows

#How to install z flashing over a door windows

New windows come with nailing flanges that extend flat along the outside surface of the house sheathing. The window is then set in the rough opening, leveled, and nailed in place.

Then a sill pan (if called for) is placed over the membrane along the bottom edge of the rough opening.

By installing in this sequence, the edges of each successive membrane strip overlap the strip below, encouraging water to shed downward. The tape is first installed along the bottom (sill), then along the sides (jambs), and finally along the top of the rough opening (head).

Next, self-stick flashing tape is installed along the inside of the rough opening-over the wrapped vapor barrier (unless the manufacturer specifies otherwise)-to form a watertight seal all along the inside edge of the rough opening.

Note: Not all window manufacturers intend for the vapor barrier to be wrapped some want it cut evenly with the edges of the rough opening because the type of flashing tape they recommend adheres better to bare wood than to the vapor barrier. The window installer will cut the vapor barrier over the window (often in an “X” pattern), and then pull the flaps through the window to the inside and staple them in place. Before windows are installed, a breathable vapor barrier is wrapped around the entire exterior of the house sheathing (un-sided plywood walls), including over the rough openings for the windows.

First, the vapor barrier (house wrap) is cut and wrapped around the inside of the window.

While the manufacturer’s specs should always take precedence, the following sequence is standard for flashing windows.

#How to install z flashing over a door install

Some windows now have built-in channels along the top that eliminate the need to install drip cap over the top. Window manufacturers will recommend the method of flashing best suited to their specific windows, and in order to maintain the warranty, that process should be carefully followed. Correctly flashing a window requires knowing when to install each type.

Vapor barrier: While not technically a type of flashing, a vapor barrier-the house wrap that installs over the entire outside of the wood sheathing before the siding is installed-is sometimes used as flashing during window installation by wrapping it around the inside edges of the rough opening.

Sill pans are commonly used in the installation of vinyl-clad windows but not as often on wood windows. It features a slope that encourages water to drain down and out.

Molded vinyl: Often called a “sill pan,” this type of window flashing is rigid and pre-formed to fit the inside of the rough opening along the bottom edge.

When firmly in place, flashing tape effectively prevents water from reaching the wood of the rough opening.

Flashing tape: This self-stick membrane comes in four-inch and six-inch rolls and is cut to fit along the inside edge of the rough opening (the frame constructed in the wall to hold the window).

Drip cap: Available in Z-shaped sheet metal strips, drip cap is designed to fit over the top of a window, much like a small canopy, to shed water outward and keep it from seeping behind the window.

Another construction material, known as a vapor barrier, is also frequently used to flash windows at the time of their installation. The three main types of window flashing are drip cap, flashing tape, and molded vinyl-and each type suits a different part of a window. Several types of flashing can be installed on a window. Flashing-whether it’s on a window, roof, or chimney-is designed to be installed in a layered sequence, similar to the way shingles are layered on a roof. Each successive layer overlaps the layer below to direct the flow of water down and away. While a home’s siding serves as its main source of protection against the elements, penetrations through the siding windows require additional waterproofing. Window flashing protects the window-and the house-from water damage. If you’re concerned or simply curious about the flashing around your windows, keep reading to learn the basics of this key component of keeping your home watertight. Over time, even a tiny gap around a window that allows water to enter can result in mold growth, wood rot, and structural damage that can end up requiring costly repairs. During the construction, a builder will take many precautions to protect a house from water damage, and one of the most important is the installation of window flashing-thin material that prevents water from seeping in around a window.