When we had acrylic shower units installed in our house apparently our employee did not know that they require concrete support under their floors. We learned about this the hard way when one of them broke with use, and we were obliged to replace it. We've used the others only infrequently since making this discovery.
Obviously it would be difficult to put concrete between an installed unit and subflooring now. Additionally, a warranty claim is not possible due the installer being under our employ (we paid him hourly), this problem is now ours to fix. Is there a product that could be used that would provide sufficient support? I assume we need something that would expand slightly to completely fill the gap with exerting too much pressure on the acrylic shower unit.
Thanks for your answers or suggestions!
Best Answer
The problem with expanding foam products is that you cannot effectively "control" the expansion, so it may expand in the gap to the point of damaging your acrylic from the other direction! The type that would be less likely to do that will also not really provide meaningful support; it will just compress with the flexing of the acrylic and you are back to square one.
I think a warranty claim against the installer is your best option. He did it wrong, he should make it right. He will not like it though because it will likely be impossible to remove the shower units without damaging them, they usually adhere them to the walls with construction adhesive.