Landscape Architect & Specifier News

APR 2018

LASN is a photographically oriented, professional journal featuring topics of concern and state-of-the-art projects designed or influenced by registered Landscape Architects.

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Continued from page 14 h a rd s c a p e s 16 Landscape Architect and Specifier News "When our clients contacted us and showed us the design concept both Lee Ann and I thought this was a perfect project to use Surface Gel Tek's (SGT) Flattoos System," Mr. Harris said. The Flattoo system is a process of etching an image into concrete using SGT's patented gelled acid and high precision vinyl templates to inlay graphics. Bob Harris, senior decorative concrete consultant at Structural Services, Inc. and founder of the Decorative Concrete Institute, had previously worked with Tamryn and Daniel Doolan, owners of SGT, and thought they would be great for the job. Bob states, "SGT's system eliminates OSHA silica dust concerns and has the added bonus of containing no volatile organic compounds, making it perfect for this project. To start, we proposed SGT produce samples to create an expectation. Then Tamryn created the Flattoos." Once the Flattoos were designed and accepted, they were placed onto the concrete pads in the park. The Harris' chose to use SGT's "HD24 Pre Grind" for the etchings. HD24 is SGT's patented gelled acid that resembles liquid acid. HD24 reacts with the surface it comes in contact with and is neutralized by water, so it poses minimal environmental issues. After applying HD24, the residue was removed by mopping with water. Then, KenResin solvent-based acrylic with non- skid additive was applied. The combination literally "popped" the acid stain marbling and brought the project to life. Tamryn and Bob have proven over the years just how successful teamwork is in the decorative concrete industry. "We've worked on projects for over 15 years with the Harris'. I've never turned down a project for being too difficult," says Tamryn. "In fact, the more challenging, the more I love it." Above: "The first weekend we cleaned and acid stained the pads using Kemiko's Golden Wheat, Malay Tan and Vintage Umber. Acid stains and concrete go together like peanut butter and jelly. The stains react with and burn into the concrete creating a natural marbling that is difficult to simulate any other way," states Tamryn Doolan, co-owner of Surface Gel Tek. Top, Right: The blue tracing laid on the ground is the company's patented Flattoo system. Fundamentally, it is a stencil that is resistant to acid based liquids and outlines where the acid should be placed. After the acid is laid, the Flattoo is removed simply with water and a mop. Bottom, Right: This project required each Flattoo template to be cut into 24 pieces with the largest pieces maxing out at over 11 feet. With the first Flattoo in place, it is time to etch it into the concrete. This step is critical to giving the project longevity because the acid becomes part of the concrete rather than sitting on top of it. The etching is fairly straightforward: Brush the acid on, scrub it in until it stops sizzling, then remove it.

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