when having work done that settling occurs it is important to understand how installers combat or remedy settling. When properly done settling should not occur and if it does it is very subtle. Gappsi Inc. makes sure that all work that gets done, we first tamper down any and all sub-base materials that involve gravel or RCA using rollers and plate compactors. Once the sub-base is properly compacted then the install is ready to be completed. For any additional information, call long island patio installers or visit our showroom for more information at (631)-543-1177, 1015 W. Jericho Turnpike Smithtown NY 11787.