I bought a model 2221 peanut soaker tub installation
I just bought a 2221 Peanut which I am in the process of installing. I found it a very stiff tub construction, compared to some of the others I looked at.
We put it in with ledger boards on 3 sides as directed, took a fair it of time to make sure they took weight, and got a pretty solid installation: with about 500 lbs of people in the tub, putting up wallboard behind it, there was no flex, movement, or noise. That's the same as one large person and 20+ gallons of water.
More to the point--the installation instructions refer to low expansion foam, and say that it is not essential but may be helpful. I still have access to the underside of tub through the plumbing access panel, and figure I can get some under most of the length of the tub anyway, JIC. Read More At : Home...