How do you stop a bathtub/shower combo from popping and cracking?

mine has don that for the last 3 years....I think it’s how they leveled the tub...not enough support under it.

dfm is correct. The foundation framework is not supporting your shower pan. That’s the part that’s under your tub to catch water that doesn’t drain, if a Since the tub is probably made of fiberglass, it will pop when you step in the right place. Here is a warning: if someone in your house weighs 250# or more and uses that tub regularly, over time, the tub will probably start cracking on the bottom side. If some one 150# jumps up and down in the tub, the tub will crack, sooner or later. It is very rare for a tub to actually break, but it happens. If you can, either call a carpenter (if he/she can get to the area under the tub through a basement or crawl space) or a plumber (if access has to be from the floor level) to evaluate your tub’s condition. Best wishes 😇

Yes, sorry to say, but your tub was not installed correctly. Fiberglass or other pliable materials need a concrete base to support it in the middle. When they install a tub they now put a concrete mix on the floor, then put the tub in before the concrete sets so it conforms to the bottom. Some manufacturers use a fiberglass pad. If you start noticing hairline cracks don't postpone replacing the tub because moisture can seep through and rot the floor. Since our family is a team of heavyweights, I prefer porcelain

coated steel tubs which are supported with concrete. Since the steel tends to make your bath water cold fast, I coated the backsides of the tub with spray insulation (Great Stuff) before it was installed. Now my water stays nice and warm.

Both Jewell and Kauai is correct!! If not fixed your really playing Russian roulette whether it breaks and when? More you weigh or if kids jump in it? It’s only time till you have a hole in the floor of your shower! In fact my lady I live with has a hole in her shower now! Had the same problem as you and it wasn’t fixed. Now there’s a hole you could stick a gallon can thru! Luckily for my lady I’m a contractor and I’ll Be replacing it for her. Only she’s got bad knees and can’t lift her feet very high. So I ‘m going to put in a wheel chair accessible shower she can walk right in without having to lift her feet! I got to do a shower pan anyway, might as well make a nicer shower while I’m at it and not have to buy another fiberglass shower again that I don’t like in the first place! Since your likely going to have to remove your shower to fix the shower pan correctly? You may want to consider a better shower design then using a molded fiberglass shower? Walls and floor can be tiled or just tile on the floor and plastic laminate on walls! You have options! Good luck

I inherited this house and it was built in 1983. So, my best option is to rebuild and replace?