How To Flash Window In Concrete Wall

Typically flashing a window is a two part process.

How to flash window in concrete wall. Window flashing is installed at the same time as the window unit. The first half of window flashing occurs when you or your builder preps the rough opening for the window s installation. Read more on window flashing. Seeing doug horgan s photos of corroded aluminum flashing in repairing a stone patio over a living space jul 16 left me concerned about using metal flashing with concrete.

Fill that space with low expansion polyurethane spray foam. The second half of window flashing occurs once the window unit is secured and squared within the rough. Although flashing is the primary focus of this tek it should be understood that the role of vapor retarders air barriers and insulation are also important elements to consider for any wall design as the performance of the entire system can be dependent on. In a concrete wall without wood framing install the window framework by fastening it into the concrete wall with self tapping concrete screws.

The first step is to wrap the sill with self adhering flashing. Install window in the flashed opening and leave adequate space all around the window for insulation. Although flanged windows were designed for installation in wood frame walls the task can be just as convenient and sound in concrete walls if proper procedure is followed. Additional information for flashing single wythe walls particularly architectural concrete masonry walls and means for providing a higher level of structural continuity at flashings is contained in tek 19 2a ref.

Caulking around the top and sides of window can often provide a temporary fix but over time the caulking will fail. For example if the windows are flashed incorrectly then siding must be removed around each window to re flash them correctly and properly integrate the flashing with the sheathing wrap such as tyvek. The aluminum flashing shown in horgan. Bill palmer an engineer and the editor in chief of concrete construction a sister publication of jlc responds.

Tek 19 5a flashing details for concrete masonry walls ref. What is the best type of flashing to use with concrete. How to install a window in a concrete wall.