In many areas, concrete is the preferred surface for tennis court construction. It is a very durable and reliable surface. It also requires proper installation to allow the Plexipave System to provide long-term performance.
There are several areas the concrete industry has modified or clarified their position on construction techniques. These changes benefit the long-term performance of the Plexipave System. It is important that you are aware of them.
1. Vapor Barriers / Vapor Retarders: The American Concrete Institute (ACI) Committee 302 updated their recommendation in April 2001 that the vapor barrier be placed directly below the concrete slab. This is very significant in eliminating the sand layers that were sometimes used in the past. The full report is available on the websitewww.concrete.org.
2. Vapor Barrier Selection: ASTM E1745 provides information on the performance capabilities of vapor barriers. 10 mil. polyethylene meets the perms transmission standard. 10 mil. poly does not generally withstand the site demands of cable placement and to resist puncture. We would recommend that vapor barrier material meet the standard for class B vapor retarders. One source is Stego Industries. They can be reached at www.stegoindustries.com.
3. Water/Cement Ratio: High water to cement ratio leads to more capillary pathways for moisture to travel through. We recommend that a water/cement ratio of .45 be specified. This should provide workability for installation while minimizing capillary pathways.
4. Curing Compounds: Some companies claim their brands of curing compound can be coated with a surfacing system. California Products remains skeptical of these claims. It is our position that concrete should not receive any curing compounds since most will interfere with adhesion of Plexipave to the surface.
As a contractor, you have thousands of details to consider. It is our hope that this information will remind you of items that help you in the future.