Unfortunately, while your state has a long statutory period for filing a construction defect claim against a builder, it's still not as long as you need, even when it is what is called a "latent" defect, or one that is not easily or readily discernable, or even hidden from disovery. Even for a defect or problem like that, you must bring a lawsuit within ten (10) years of "substantial completion" (basically, completion but for finishes and "punch list" details) of the home--again, even if you could not find the defect until late. 10 years is a hard deadline, and at 15 years, you would have exceeded it.