Installation Sheet

A
1"
1"
X
Figure 1a
1"
Figure 1b
Mortar
The two most common types of installations are DROP-IN and THREE WALL installations. DROP-IN (Figure 1)
For drop-in, or deck-mounted tubs, the nished height of the deck (X) where the tub will sit must equal the
dimension from the trimmed edge of the tub to the oor at the drain end of the tub (A) plus 1”. The 1” is for
the mortar bed.
NOTE: Tub lip resting on ledge, stringer or frame
is non-weight bearing.
Tub MUST be supported by mortor only.
GENERAL REQUIREMENTS FOR INSTALLATION
MECHANICAL REQUIREMENTS:
1. WEIGHT: Tubs must be installed in a location that will support the combined weight of the tub plus the water
plus the bather. As a rule of thumb, this will be a maximum of 1000 lbs. for a 60" tub, 1200 lbs. for a 66" tub, and
1400 lbs. for a 72" tub.
2. TILE FLANGES: Tubs can be installed as a drop-in unit or they can be installed against one, two or three walls.
Tubs installed against walls should be ordered with a tile ange on each side that will be against a wall to
provide a leak free water barrier.
3. FRAMING: When framing it is best to measure the actual tub to be installed to determine framing dimensions.
In the abscence of the actual tub, refer to the Hydro Systems catalog drawings or website at www.hydrosystem.com.
4. All support is from the mortar base. No weight shall be bared by the lip or the deck of the bathtub.
IMPORTANT - the deck must be level both front to back and side to side. If it is not level, the tub will not drain
properly. The opening into which the tub will be dropped should be cut 1" smaller than the tub on all four sides.
For example, for a 60" x 42" rectangular tub, an opening 58" x 40" will extend 1" under the lip of the tub all the way
around and will provide clearance for the whirlpool system. In the case of oval and round tubs, Hydro Systems ships a
full size paper template with the tub; cut 1” inside the outside diameter (o.d.).
THREE WALL: For tubs installed in a three wall enclosure, the tub will need a rough opening the same size as its
overall dimensions. For example, a 60" x 42" tub will need a space 60" x 42" for installation. Do not include nish
wall coverings (wall board, tile, etc) in your rough framing calculations. Studs and walls should be straight and plumb,
and corners must be square. Stringers must be provided to support the deck where it meets the wall.
IMPORTANT - The stringers must be level both front to back and side to side. If they are not level, the tub will
not be level and it will not drain properly.
Please refer to www.hydrosystem.com for videos on how to install your bathtub and get specific dimensions
on your model bathtub
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