- Jul 2, 2007
Okay, so this house we bought things just aren't going smooth in a few ways. We paid a master plumber to do a partial bathroom remodel. He and his assistance or apprentice removed a combo tub/shower, the type typically used in homes built within the last 15 or so yrs. It was replaced with a shower only alcove of dimensions 60 x 32 x 80, and a semi frameless bypass sliding shower door. It was a turn-key job with them subbing out the drywall work and them doing all the removal of old and install of new. They put in the following alcove, Aker by Maax KDS 3060 https:/
It's a left seat right drain config. As soon as we used it, there was a floor flexing issue right where you stand while showering, about an area of 16" lengthwise. Up around the drain and towards the back of the floor pan it is firm and doesn't flex. Neither of us are overweight, she's about 150 I'm about 200. The middle of the flex zone you can actually take your hand and press down and feel it move maybe 1/8" until it contacts the subfloor.
Clearly, it's an installation issue. Again, pro install, not DIY.
Notified them of the situation and they came out, checked it, and said they'd come back the next day and could either shim it from crawl space or use an expanding foam product like Dupont Great Stuff Door and Window gap sealer to create a rigid substrate in the area that needs support. They said it has "feet" on underside of the floor pan and the center ones must be lacking a bit from resting on the subfloor.
After they came back and did the specified procedure, lo and behold the next morning it's not much different, still flexing in the same place under foot when showering. This evening after work I went into the crawl space to see if they did in fact foam it and they did, There is about a 8" diameter hole in subfloor where the drain and pipe come through, and there is dried/cured foam all along the back radius of the hole so clearly they attempted to insert expanding foam but likely just didn't get enough of it far enough back to fill the problem area completely.
My first question: Will this type of insulating foam like Great Stuff even be rigid enough to serve as an effective substrate for purpose of stabilizing the fiberglass shower floor? Second question, what do you think about using a drill with maybe a 1' or so diameter hole saw bit to make a few entry points in the subfloor under the problem area to insert and spray foam where they weren't able to get it to from the farther forward drain pipe access? Subfloor looks to be about a 3/4" thickness or better OSB.
There aren't many other choices except the Nuclear Option which would be demanding a tear-out and re-do, and 1. I'm not sure they'll do it, and 2. We don't really want the mess. They put this shower alcove in before we moved in, but we're moved in now and it would be a major annoyance. maax.com/ en/ product/ kds-3060_145036/