Guide For Stucco Removal Remediation And Repair
- Author Glenn Smith
- Published November 19, 2008
- Word count 762
"Stucco (Portland cement plaster) is sometimes removed from a building to determine if proper flashing was installed, replace leaky windows, repair water damaged wood framing members or other reasons that would require the removal of the stucco around windows. It is possible to patch and restore the stucco membrane. Removal procedures can vary depending on the substrate, framing and overall remediation plans. The following outlined procedure is for removal and replacement of cement stucco around windows on wood framed walls. This guide is limited to the removal and replacement of the stucco and not specific to window installation and related flashings. There are several types and styles of windows and a variety of methods for flashing. This document is intended to focus on the lath and cement plaster work for remediation.
It is important to determine the expectations of the building owner and inform them of the finishing options. The finishing options to the repairs around windows depending on the degree or desire of finish appearance and should be discussed prior to the start of work. The following will help with some decisions, options and help clear up confusion for all parties involved.
Evaluation:
A comprehensive evaluation of the exterior plaster should be conducted by qualified persons prior to making any decisions for final scope of repairs. An important item needed to determine the full scope of stucco repairs is the type of finish coat (acrylic or cement) on the building and the overall condition of the walls. Has the building been painted and what type of paint was used? Buildings with elastomeric type paints will limit the options of repairs.
STUCCO REMOVAL
Stucco removal can be very dusty; protective clothing, eye protection, and a respirator are always recommended. The removal of stucco is best done by cutting the stucco with a power saw using a masonry blade. The blade should be set to just shy of the full thickness of the stucco membrane, usually 3/4 of an inch. This will protect the underlying weather-resistive (WR) membrane from damage. Masonry blades wear down quickly and it will be necessary to adjust the blade depth frequently. The stucco cuts should be approximately 12 to 24 inches away from the window frame. Vertical cuts may be further away from the window as they should reach the next framing member (stud). Once the saw cuts are complete, a cold chisel can be placed into the saw cut and used to break or fracture the last remaining uncut thickness of plaster. The stucco can then be pulled off the wall with minimal damage to the underlying WR membrane. For large areas of removal, it is suggested to cut the stucco into squares that can be easily handled.
In some rare cases the WR membrane may be adhered to the back of the stucco. In these instances it will be necessary to remove the stucco back to point where the stucco is not bonded the WR membrane.
The cut stucco edge will be straight and smooth, it is recommended the edges be jagged and rough. This will produce a better key (bond) between the new patch and existing stucco and can minimize the chance for a separation crack. A hammer can be used to chip away small sections, leaving some of the metal lath exposed if possible.
The WR membrane should be peeled back carefully to minimize tears, holes or other damage to the WR membrane. It is necessary to leave some existing WR membrane for proper lap and integration with flashings. A minimum two-inch over lap on horizontal joints and a six-inch overlap on vertical joints of the WR membrane will be needed when final lathing takes place.
STUCCO REMEDIATION
(Flashing and WR membrane)
The installation/remediation of the framing, sheathing, window, and all flashings should be complete and inspected by qualified persons prior to installing the WR membrane. There are several options, methods, and products for flashing windows. Many of these options are in the NWCB Stucco Resource Guide. The NWCB recommends the WR membrane and all flashings should be installed in ""shingle"" fashion if at all possible. This means all upper layers overlap lower layers to direct water down and ultimately out at a ""weep"" point. This would include all ""peel and stick"" type flashing membranes, metal and PVC flashings. An asphalt emulsion can be used over the exposed surface of the WR membrane to seal minor holes and tears. Compatibility of products and materials should always checked prior to installation. Some materials can have an adverse reaction to asphalt saturated products or polyolefin spun bonded products. "
Glenn Smith is the author of this article. Stark Development Inc Specialize is stucco removal, stucco remediation, stucco repair and all kind of repairs and complete remodel. For more info on stucco Please visit stucco
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