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A properly installed and maintained paver patio should not become wavy over time. The key is in the base preparation. A minimum of 5" of aggregate base (we call it item 4) should be installed and compacted to 95% compaction. This is essential to a long lasting job.
After the patio is built, there is some maintenance on the customer's part that will help ensure long lasting beauty. Weed control is essential and growth will take place in any paver patio. A monthly patrol for weeds will keep a large root system from pushing the bricks.
Ant control is necessary as well. Ants are attracted to the moist sand bed the pavers are laid in, and when they excavate for their nest, a depression results in the patio. There are insecticides available to control this activity.
There must be no water flow over or around the paver job, as in runoff from rainstorms or downspouts. Erosion will take place and an uneven grade will result. A good contractor will take this into consideration when he bids the job.
Color can be maintained with one of the various types of sealers available for concrete pavers. You can ask your contractor to apply it or do the job yourself with a pump sprayer.
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