Installing a whirlpool bathtub

Whirlpool bathtubs are a perennial favorite for new homes and remodeling projects alike. And while not particularly difficult to install, they do involve some procedures uniquely their own.

While whirlpool tubs are available as a tub/shower combination, which comprise a fiberglass bathtub with a three-sided shower enclosure, you’ll find the biggest selection is in bathtubs by themselves. Most of the tubs are designed for platform mounting, meaning that they are open and unfinished on all four sides and are installed by placing them into a site-built wooden platform.

Some types of tubs also have an optional finished front panel, allowing the tub to be mounted into a three-sided alcove like a conventional bathtub and have the finished panel facing into the room.

Platform installation

To install a platform-mounted whirlpool tub, you first need to construct the platform. There is no set way of doing this, as sizes, configurations and on-site conditions will vary widely. You’ll need to adapt your framing to the specific room you’re working in.

Typically, the platform is constructed by building short walls of 2-inch-by-6-inch lumber on 16-inch centers, then adding a top of 3/4-inch exterior-grade plywood. A hole is cut in the top of the plywood platform that accommodates the size and shape of the tub — rough-in dimensions for the size of the hole are included with the tub.

The platform can be completely freestanding, but most platforms are built against one or more walls — typically in a corner. Remember that you will need to provide an access door in the platform that is adjacent to the tub’s motor location to allow access to the pump and the electrical wiring, so plan your installation accordingly.

The platform can also be made to pretty much any practical height, but in most applications the platform height is determined by the height of the tub. The bottom of the tub needs to be fully supported on the floor, so if you build a high platform, you may also need to build up supports for the tub.

For example, if the tub is 20 inches deep and you construct a platform that is 26 inches high, you’ll need to also build up a smaller 6-inch-high platform inside the main platform to support the bottom of the tub. Once the height of the platform is determined, one or more steps are then built to allow easy access into and out of the tub. …CONTINUED

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