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Design Ideas: Concrete Floor Info
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  • On the lower level of the beach house, the interior concrete floors and exterior deck are made to look as if the ocean surf has washed into the room. The effects were achieved with acid stains, embedded beach glass, and seashells.
  • In the kitchen, the stained concrete floors are warmed by radiant heat. The concrete nook has an overhead light that illuminates a display of bottles, vases and sculptures.
  • The stairway is a juxtaposition of rough concrete treads, "beachified" with sand and seashells, set against smooth, geometric stainless steel faces.
  • In the children's bedroom, the concrete floor is accented by a grid of stainless steel strips. The floor was sandblasted alongside the pieces of steel, and then acid stain was applied in a combination of Padre Brown and Antique Amber.
  • This view of the children's floor shows the effect achieved by allowing the darker Padre Brown acid stain to bleed into the lighter Antique Amber portion of the floor.
  • The poured concrete walls were given fissures, cracks and veins to resemble the face of a cliff.
  • As in the rest of the house, the floor in the living room has veins and small craters throughout. The staining in the veins is a Padre Brown highlighted with a Fern Green, which then drifts into the main portion of the floor, stained in Antique Amber.

The challenge
Sometimes contractors are given a challenge beyond their wildest dreams. That was the case for Tom Ralston of Tom Ralston Concrete. His talents were put to the test recently when architect Dennis Briton of Carmel asked for Ralston's help on a home nestled into a cliff side on Pleasure Point Beach in Santa Cruz.

Design goals
The architect wanted the concrete floors and walls of the home to look as if they had been worn and weathered by the ocean waves. The goal was to achieve harmony with the coastal environment, in which the home becomes one with the ocean. For the poured concrete walls, "we wanted to recreate the cliffs below and around, giving them fissures, cracks and veins," says Ralston.

Secrets to success

  • To replicate the veined look of an ocean-washed seashore in the floors, Ralston employed multiple colors of acid stains along with embedded accents of beach glass, aquarium sand, and seashells.

  • A weathered, worn appearance was achieved by using a retardant to take away about 1/8 inch of the concrete surface. Ralston used a turkey baster to shoot out small random holes, or craters, in the concrete and then used an artist's brush to apply a dark acid stain in the holes.

  • The technique used to create the walls was to randomly pour the concrete into the forms and then lightly vibrate them in order to retain some of the bug holes and air pockets. "While we were waiting for the concrete to set up, we also sprinkled on rock glass so that when the forms were pulled, we had successfully created the fissures," says Ralston.

A 'wonderful medium'
For this project, concrete not only enabled the homeowner to bring the ocean indoors, it also contrasted beautifully with the other materials used in the home. "The architect loves concrete and all that it can be used for," says Ralston. "He thought that with the other elements that were going to be used in the house, like polished imported glass tiles, stainless steel railings, stainless steel stair noses, and smooth green glass used as a partition, that the treated concrete would make a wonderful medium. We showed the architect and designer examples of unusual and unique concrete treatments that we thought would bring the ocean and surrounds into the house."

Tom Ralston Concrete, Santa Cruz, Calif.

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