vibration sensation when jumoing in fiberglass pool

Aug 28, 2012
1
I recently had a fiberglass pool installed. On the shallow end, when the children jump i can feel a vibrating sensation. It is along the step and each side of the shallow end. My builder dug up the pavers and "sand blasted" more peeble under pool. The sensation on step is less, but still there. The sides are unchanged. Is it acceptable to feel any vibration? Will this cause any cracks? My builder is not interested in fixing the problem. He says it is normal and will not cause harm..
 
I've never had one but it sounds like when a pool is one piece essentially and it is full of water, it is creating a frequency vibration when disturbed. I'm not an engineer but it sounds like there might be some space between the pool and dirt somewhere.-
 
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