A Closer Look At Stucco Replacement

Stucco (Portland cement plaster) is often extracted from a house to assess if adequate flashing has been added, patch leaky windows, restore wood framing members weakened by flood or other causes that may cause the stucco around windows to be removed. Patching and replacing the stucco membrane is necessary. Depend Exteriors – Edmonton stucco replacement is one of the authority sites on this topic. Depending on the substrate, framing and overall remediation plans, removal procedures may differ. The process described below is for the removal and installation of cement stucco on wood framed walls around windows. This guidance is restricted to stucco removal and repair and is not applicable to the construction of windows and associated flashings. There are many window sizes and designs and a number of blinking techniques. This paper is meant to concentrate on the remediation work of lath and cement plaster.

Determining the building owner’s requirements and reminding them of the finishing options is significant. Depending on the degree or preference of finish presentation, the finishing choices for repairs around windows and should be addressed before the start of work. For both those concerned, the following will assist with certain decisions, alternatives and help clear up uncertainty.


Before making any conclusions about the final extent of repairs, a thorough assessment of the external plaster should be carried out by competent people. The type of finish coat (acrylic or cement) on the building and the general state of the walls are a significant item required to assess the complete extent of stucco repairs. Has the frame been painted and what sort of color has been used? Buildings of elastomeric paint styles can restrict repair choices.


Removing stucco may be very dusty; it is often advised to use safe clothes, eye masks, and a respirator. Using a masonry blade, the stucco removal is better achieved by removing the stucco using a power saw. The blade, normally 3/4 of an inch, should be adjusted to just short of the stucco membrane’s maximum thickness. This will guard against disruption to the underlying weather-resistive (WR) membrane. Masonry blades wear down easily and the blade depth may need to be regularly changed. The cuts through the stucco should be around 12 to 24 inches from the window cover. As they should hit the next framing member, vertical cuts can be further away from the window (stud). A cold chisel should be inserted into the saw cut until the saw cuts are complete and used to crack or fracture the last remaining uncut plaster thickness. With minimum disruption to the underlying WR membrane, the stucco may then be ripped off the wall. It is recommended to break the stucco into squares for wide areas of elimination, which can be quickly done.

The WR membrane can be affixed to the back of the stucco in certain unusual instances. It would be appropriate in these situations to remove the stucco back to the stage that the WR membrane is not bonded to the stucco.

It is advised that the cut stucco edge be clear and flat and that the corners be jagged and rough. This would build a safer key (bond) between the current stucco and the new patch and will minimize the risk of a separation break. In order to hack away tiny bits, a hammer may be used, leaving any of the metal lath visible if necessary.

To minimize tears, gaps or any harm to the WR membrane, the WR membrane should be peeled back carefully. For proper lap and integration with flashings, some internal WR membrane should be left. When final lathing takes place, a minimum two-inch over lap on horizontal joints and a six-inch overlap on vertical joints of the WR membrane will be needed.