The Art and Architecture of Stucco: From Lime Plaster to Florida Homes

What Stucco Is

Stucco is a plaster made for outside walls. It's a finish, not the structure: the wall underneath is block, brick, stone or a wood frame, and the stucco covers it in a hard, continuous coat.

What it's made of has changed over time. The National Park Service, in its guide to historic stucco, explains that until the late 1800s stucco "was primarily lime-based." After about 1900, "most stucco was composed primarily of portland cement, mixed with some lime." Sand and water make up the rest.

Lime Stucco: The Old Way

"Stucco has been used since ancient times," the NPS notes. For most of that history, it was lime plaster: burned limestone or shell, mixed with sand and water, which hardens slowly by taking in carbon dioxide from the air. Lime stucco is softer and more forgiving than cement, and it lets moisture move through the wall.

Florida's oldest city shows the tradition. At St. Augustine's Castillo de San Marcos, begun in 1672, the mortar between the coquina stones was lime made by burning oyster shells, mixed with sand and water.

Builders also used stucco to look like something it wasn't. The NPS describes it as an inexpensive material that "could simulate finely dressed stonework, especially when 'scored' or 'lined' in the European tradition," with lines cut into the wet surface to imitate blocks of cut stone.

Decorative Stucco: Plaster as Art

Inside churches and palaces, stucco became sculpture. Plasterers in Renaissance Italy and Baroque and Rococo Europe modeled fine plaster into cornices, ceilings, garlands and whole figures, then painted or gilded them. The ornament on many grand interiors that looks like carved stone is stucco.

This short film looks at stucco's role in Rococo interiors:

Video: "Stucco: The Rococo's Secret Ingredient - Part 1" by ZCZ Films on YouTube.

Portland Cement and the American Stucco Craze

Portland cement changed stucco from a craft into a mass building material. The NPS notes that portland cement "was first manufactured in the United States in 1871," and that its spread, together with the revival styles popular around 1900, "resulted in a 'craze' for stucco as a building material."

From about 1890 into the 1930s and 1940s, the NPS says, stucco went hand in hand with a long list of styles: Prairie, Art Deco and Art Moderne, Spanish Colonial, Mission, Pueblo, Mediterranean and Tudor Revival, and the everyday bungalow. The Spanish Colonial Revival did the most for it, "since stucco clearly looked like adobe." Stucco buildings were "especially prevalent in California, the Southwest and Florida."

Stucco in Florida Architecture

Florida's look owes a lot to stucco:

• Spanish and Caribbean roots. The NPS points to the Hemingway House in Key West, "built of stuccoed limestone in a Spanish Caribbean style."
• The 1920s land boom. Miami-Dade County's architectural history describes the decade's land boom as "the catalyst for many subdivisions," and the "City Beautiful" neighborhoods of the time used "Mediterranean Revival styled architectural detail": stucco walls, arches and tile roofs.
• Art Deco to MiMo. After the 1926 hurricane and the downturn that followed, the county says, building turned to "highly decorated Art Deco styles," then Streamline Moderne and Miami Modern (MiMo), smooth stucco buildings with crisp lines.
• The block home. After World War II, concrete block became the standard Florida house wall, and stucco its standard finish. Most Florida homes today are block with stucco over it.

Our guide to stucco siding explains how today's stucco walls are built.

Stucco Finishes and Details

The same plaster can look very different depending on how it's finished:

• Smooth finishes, troweled flat, suit Deco, MiMo and modern homes.
• Sand finishes have a fine, even grain and are the most common on Florida homes.
• Hand-troweled finishes, such as skip trowel and lace, leave the irregular texture of Spanish and Mediterranean styles.
• Details such as scored "stone" lines, quoins at the corners, arches and banding around windows give stucco walls their character.

A repair that ignores the finish shows. Matching texture and color is half the work of any good stucco repair.

Caring for Older Stucco

Older stucco needs repairs that respect what it's made of. The NPS warns that patches in portland cement, "which tends to be very rigid," are incompatible with the "mostly soft lime-based stucco" of early buildings, and that inexpert repairs like that "may have caused additional deterioration." Repairs to historic stucco use materials matched to the original.

Modern portland cement stucco on a block or frame home is repaired with stucco, matched to the finish. Your local Stucco HQ contractor sees the wall in person and gives you a free written estimate. See how a stucco repair works, or read about coquina and shell finishes.

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