Perfect Plaster

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Synthetic stuccos are convenient, go on quickly, dry rapidly and provide a nice finish. They are typically used for exterior applications, where they form a protective, waterproof, nonbreathable barrier. More flexible than other materials, synthetic stuccos expand and contract without cracking in response to changes in temperature.

When manufacturers first introduced them in the 1980s, synthetic stuccos promised excellent, low-maintenance protection against the elements. Unfortunately, in the early 1990s many homeowners and home inspectors began to notice serious problems — most notably, rotting walls — caused when the synthetic stuccos were improperly installed or when cracks were not sealed. Inspectors soon found that water, which had entered wood-frame walls from various sources (cracks around windows, for instance), couldn't escape. The waterproof membrane trapped even small amounts of moisture, causing framing members and wood sheathing to rot, often resulting in severe structural problems.

Homeowners and insurance companies have spent millions of dollars repairing homes coated with synthetic stuccos, says David Dobb, a contributor to This Old House Online ( www.thisoldhouse.com ). So serious are the problems that several class-action lawsuits have been brought against the manufacturers. Some municipalities have banned synthetic stuccos completely.

In the wake of this disaster, manufacturers have devised a new technique for applying synthetic stuccos. In this system, a waterproof, but breathable, house wrap is first applied to the sheathing. Then a thin mesh is attached to create a route for water drainage. Rigid foam is nailed in place next, and stucco is applied over the foam.

Although these steps add to the cost of application, this new, improved system is believed to prevent water accumulation in walls. Use this material with caution and inspect your walls for cracks and water intrusion regularly; every six months is recommended. If you find damage, repair it immediately.

PERFECT PLASTER

Matching the right material to the job is the key to perfect plaster. While plastering is a rather labor-intensive process that requires considerable patience and skill, with a little training and experience, almost anyone can master it.

If you're not tempted to try your hand at plastering, hire a professional. Although it will cost quite a bit more, the results will be well worth it. Choose wisely and design your home to protect the plaster from water, its No. 1 nemesis. Protect your plaster or stucco and it will protect your home for many years to come.

MOTHER Contributing Editor Dan Chiras is an authority on environmental issues and sustainable building. His latest book is The Natural Plaster Book, on sale soon at www.motherearthnews.com .

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