If you have plans to install a
Jacuzzi tub first check with your local building inspector as you will most
likely need to pull a permit for the electrical work. In addition, the building
inspector can also assess any structural concerns that may need to be addressed,
such as the installation of additional floor joists to support the added weight
of a Jacuzzi tub.
Framing a Jacuzzi
To frame a Jacuzzi tub first make
sure the subfloor base is of proper construction to support the weight of a full
tub. For example, make sure there are adequate floor joists of both size and
frequency underneath the proposed Jacuzzi whirlpool tub area. In addition, make
sure the subfloor is constructed out of ¾” tongue and grooved plywood and that
it is not damaged in any way. It is important to remember when framing a Jacuzzi
tub that the full weight of the Jacuzzi tub will actually rest on the floor and
not the side walls.
To frame the side walls for the Jacuzzi tub use standard framing techniques.
When framing the Jacuzzi tub walls use 2x4s or 2x6s. The walls should be
constructed by including a top and bottom plate and vertical stud members spaced
on 16 inch centers. The wall height should be the same height as the bottom edge
of the Jacuzzi tub when it rests flat on the floor with any required spacers
installed. Use a measuring tape to measure from the bottom edge of the Jacuzzi
tub overhang to the floor, to determine the proper framed wall height.
Make sure to identify a location in the framed wall area for an access panel.
Select a location that is near the electrical wiring and pump assembly.
Now, apply 2 inches of mortar into
the base of the Jacuzzi tub frame area to support the tub itself. Make sure you
follow the Jacuzzi tub’s manufacturer’s directions on where to NOT apply mortar.
There should be voids in the mortar bed for the pump assembly and for the
support blocks. The mortar is necessary to help provide better support for the
fiberglass Jacuzzi tub.
Next, place a layer of plastic over the soft mortar bed and apply construction
adhesive to the bottom of the support blocks.
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Now, apply a bathroom and kitchen silicone caulk around the perimeter of the
framed Jacuzzi tub wall to create a water tight seal with the bottom edge flange
of the Jacuzzi tub.
Then sit the Jacuzzi tub into the framed Jacuzzi base. Make sure when installing
the Jacuzzi tub that it is sitting on its support spacer blocks and that the
support spacer blocks are not resting on any mortar.
After installing the Jacuzzi tub into the framed base and connecting up the
electrical wiring and plumbing, install greenboard or cement backerboard to the
side walls and top deck surface. The cement backer board should be used if you
plan to install ceramic tile on the walls and/or top surface of the Jacuzzi tub
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