Re: problems with tanning ledge
Trilogy is the only fiberglass company that I know of that have 'separate" pool parts such as tanning ledges (often called 'beach entries" by other builders) in addition to the main pool shell. IMHO, the install in a fiberglass pool is the most important component and manufacturers do not usually warranty problems that can be attributed to a faulty install. The three major fiberglass companies (San Juan, Blue Hawaiian, and Viking) make pools that are one piece construction with such things as beach areas (tanning ledges), negative edges, and seating are part of the one piece molded shell. San Juan even has models that include spillover spas integrated with the pool shell. IMHO, this allows for an easier install with less chance of errors.
Trilogy is actually one of the newer entries into the fiberglass market, only having been in business since 1999. For comparison San Juan started in 1958.
If the substrate has washed away because of improper backfill they might be able to dig from underneath and shoot in shotcrete. I have seen this done here in Florida to stabilize fiberglass pools but it really depends on your local building codes and climate conditions. Anything that damages the fiberglass shell is not a good option, IMHO, but it might be the only way under some circumstances.
This is really a pool bulder issue and it sounds like it was a faulty install, which is rather too common with fiberglass pools no matter how well the shell is manufactured.
Retired pool store and commercial pool maintenance guy.
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