How to Install Band of Exposed Rocks in Poured Concrete Wall
Cultured stone is a revolutionary product made from a mixture based on portland cement and colorant. It is a relatively lightweight product that easily can be installed over existing cement or even a wooden wall, with the correct preparation. Installing cultured stone over a cement base can yield a durable and interesting surface if properly applied. Does this Spark an idea?
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Things You'll Need
- Wet tile saw with diamond blade
- Measuring tape
- Pencil
- Chalk line
- Level
- Type N mortar
- Acrylic additive
- Mortar trowel
- Mortar rake
Instructions
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Wash the wall section that will have the cultured stones applied to it. Use soap and water or a high pressure hose. Be sure the wall is as clean and dust-free as it can be. When the wall is dry, mark the edges of the band area and, with the help of a friend, snap a chalk line along the edges. Use a level to check your lines because these will be your guides to the band installation.
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2
Cut stones intended for the edges to size. A herringbone or other regular pattern may require quite a few cuts to make the stones fit correctly. Rinse the stones after they are cut to dislodge debris created by the cutting.
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3
Starting on one end, apply the mortar 1/2-inch to 3/4-inch thick, depending on your stone (bigger stones need more mortar). Do not apply more than a few stones' worth of mortar at once; this amount will vary depending on the stone type and pattern you choose to use. Once the mortar is applied, run the rake over it to produce extra texture for bonding.
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Apply acrylic additive to the mortared surface. Immediately apply your first stone, pressing inward and holding for about 10 seconds, or until the stone has adhered. It may be a slow process, but it is far easier to take your time than to have to go back and fix sagging stones.
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Install additional stones until only a few inches of mortared surface remain. Apply additional mortar and acrylic in a similar fashion and continue working top to bottom and side to side alternatively. Do not allow the mortar to dry much or your stones will fail to adhere long-term.
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Apply grout to the stones once all the stones are mortared to the wall. The type of grout and method will vary based on the pattern your choose. The goal, however, is to make it look as realistic as possible. A grout bag or grout that comes in a container with an applicator may help if you wish to hide the grout as much as possible.
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Tips & Warnings
The preparation for this job will make the most impact upon whether this project succeeds or fails. Do not skimp on cleaning or lay too much mortar at one time. You are far better off to spread mortar over too little an area than too much.
References
Resources
- Photo Credit stone background image by Ogis from Fotolia.com
