3
There are many possible ways to install your new MTI tub, and some may require different framing
than the following instructions. Keep in mind that the framing should always provide a level surface for
the rim of the tub and sufficient space below the tub for bedding compound.
Access must be pro-
vided to each pump and/or electrical component on your tub. The access panels must have
a minimum size of 16” x 14” for installation and future servicing of the pump and/or electrical
equipment. MTI will not authorize any service unless clear access is available. Access from a
crawlspace or incomplete access to all equipment may result in warranty claims being denied.
Additional access to plumbing fixtures is strongly recommended. It is the responsibility of the installer to
comply with local plumbing codes regarding pump and plumbing access.
Note:
Do not allow any mate-
rial such as insulation within 8” of pump. Pump must have sufficient air space surrounding it for circula-
tion and proper operation.
GENERAL INSTALLATION GUIDELINES
Take all final installation dimensions from your
tub.
All printed specifications for MTI tubs have +/- ½” tolerance AND ARE SUBJECT TO
CHANGE AT ANY TIME. Note: add approximately 2-3 inches to the over-all tub height for drop-
in tubs equipped with pre-leveled foam base and/or pre-leveled frame. The bolts/screws
through the mounting feet on the pump may be loosened or removed once the tub is in place
,
if
necessary for future servicing.
MTI tubs are not equipped with leveling feet! Wooden blocks under must be removed prior to
installation.
The tub must be leveled from the top flange in both directions
.MTI recommends Quikrete
#1103 sand/topping mix
for bedding the tub
.
Plaster
,
sheet rock mud
and sand
are NOT sufficient
bedding compounds
!
Determine the final height of the tub rim by measuring from the underside of the
rim to the floor on the
drain side
and add ½” to allow for bedding compound
, unless your tub has our
factory installed pre-leveled foam base.
The tub must be leveled by the rim, and supported by the
bedding (or
MTI
foam base) under the full length of the tub bottom. It is recommended to use a plastic
sheet barrier on top of and underneath the bedding compound. Carefully lower tub into place. Shift tub
side to side to settle into compound. The tub will not drain properly if not level both front to back and
side to side. Use care not to damage any plumbing, wiring or other options when bedding the tub. Let
compound harden over-night before use. Failure to properly bed the tub will void any warranty on the
tub shell.
NOTE:
Pre-leveled frame eliminates the need to frame the walls or use bedding compound to level the
tub, assuming the floor is perfectly level. If not, some bedding compound may be needed to achieve level.
The pre-leveled frame adds ½ to 3 inches of height, depending on the specific model of tub.
Mark a level line on the stud walls using the measurement determined
above. A 2” x 2” or similar stringer will be attached to the studs touch-
ing this line. All mounting surfaces must be level to allow for proper
drainage. Framing of the same height should be constructed across
the front of the tub for skirt, tile or other material. Remember to allow
for access to each pump, blower and/or electrical component.
DROP IN
Use the above dimension as the finished deck height from the
floor. The drop in opening should be approximately 1 ½ inches
smaller than the outside dimensions of the tub. This will create a
¾ inch ledge to support the entire rim of the tub. It is best to have
as large an opening as possible in the deck to clear the plumbing
and other tub accessories during install while still pro-viding full
support for the rim. Full size templates for oval tubs can be
purchased through your distributor.
NOTE: Most MTI BASICS tubs are NOT undermountable. See
individual tub specification sheets.
Have tub at jobsite and measure or template very carefully before cutting any decking materials.
MTI is not responsible for any preparatory labor or materials.
If your application calls for solid
surface material covering only the width of the tub flange, additional support for the solid surface material
is
not
necessary.
(continued on next page)
Leveling Stringers
For whirlpools, be sure to provide
an opening of at least 16” x 14”
for pump access.
For whirlpools, be sure to
provide an opening of at
least 16" x 14" for pump
access.
ALCOVE
