Concrete Countertops (Continued)
Concrete Countertops Information
 Concrete Countertop Problems
Don't leave acidic liquids - citrus juices, wines, vinegar,
and alcohol - on unsealed concrete, since they can etch into the surface. Also, oil and fat can soak in. Consider
having raised strips of metal cast into countertops like runners or stainless steel sheets molded around the cook
top for hot pots and pans. These the metal will also protect against abrasion. Do not use abrasive pads or
powders on sealed counters. Clean with warm water and a non ammoniated, nonabrasive cleanser when not using a
stone soap. Do not place hot objects or adhesive tapes on the waxed surface - they could cause the surface to become discolored.
Concrete Countertop Facts
Concrete countertops usually cost more than granite up to twice as much.
A 1.5" thick standard concrete countertop has an approximate weight of 18.75 pounds per
square foot. (Granite is approximately 18 pounds per square foot.) The countertop weight
can be less if lightweight concrete is used. Though some countertop contractors will not
use lightweight concrete because it has less strength. Most building codes require a
minimum design load for a floor of about 65lbs per square foot. A typical cabinet will support the concrete weight.
You may choose from a wide range of colorings for your countertops. Each contractor will
have different methods of coloring your countertop, ranging from integral coloring,
broadcast color hardeners, and acid stainings. Most contractors can custom color match samples.
The real beauty of using concrete as a material for your countertop is that each cast is
unique. It's color, texture and porosity will vary depending on finishing technique, coloring,
curing methods, and skill. They are true works of art and therefore.. no two are alike.
Concrete slabs should not exceed around 8' x 3'. Oversized slabs are usually hard to work
with and are also more likely to crack. This just means that for large applications seams
may be required but they can become a very attractive element of the design.
Concrete counter tops may and often do get hairline cracking. This really does depend on
the method of construction, conditions during the installation and finishing techniques.
Proponents often say these cracks add to the rustic feel of the final product. Most slabs
should be reinforced with steel and wire mesh, therefore the hairline cracks do not affect the structural integrity of the slabs.
Concrete countertops will stain and should have a sealer applied for water and stain
resistance. The type of sealer used on the concrete countertops varies depending on your
situation and your personal preferences. They vary from food safe, water-based, acrylic,
epoxy sealers, and liquid wax. Concrete countertops will also burn if not protected from
hot pans and can also be scratched so be careful if you choose this product.
Avoid abrasive soaps or cleansers. You can use a mild, non-abrasive, non ammoniated
soap for daily cleaning. Try Simple Green (dilute as suggested) or Dr. Bronner's natural
soap (5 parts water, one part soap) and you should avoid using abrasive pads. In short,
cleaning your countertop is not going to be any more difficult than cleaning any other
type of countertops. Follow the instructions provided by the countertop contractor- they will have experience with what works for their product.
For more information check out books from Fu-Tung Cheng, the founder of the Concrete
Exchange, an internationally known designer and author, who has pioneered the craft of
making concrete countertops. Fu-Tung Cheng's first book, Concrete Countertops: Designs
, Forms, and Finishes for the New Kitchen and Bath (Taunton Press, 2002) has become a national bestseller.
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