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Thanks for all the responses and suggestions guys. I originally thought that there could have been a gap between the mortar and the bottom of the tub but both installers claimed they filled the tub with water to set the tub in the mortar bed. Perhaps the mortar mix was too wet and flattened...

Thanks for the quick reply. The subfloor is 1/2" plywood. The home was built in the early 70's. Do you think that thickening the subfloor will help stiffen it enough? The installer is recommending to rip out my living room ceiling below the tub and sistering the joists.

Hi, Just like the title says... we have gone through 2 acrylic tubs in 2 years. Both have developed hairline cracks in the bottom of them within a year of installation. The first was installed by a professional plumbing company and they placed the tub in Durabond 90 compound. The second was...