Installation Instructions

INSTALL MANUAL FOR TUB CONVERSION KITS

By T. Kister

convertyourtub.com | tubconversionkits@gmail.com | 480 255 1689

3.  Measure the Top Thickness of the Tub - See FIGURE 3
           A.  Measure the thickness of the wall, at the top, below                          the inside and outside rounded edges. 

Please record the results of your measurements on this form:

Tools Needed to Measure Your Tub

  • Tape Measure
  • Straight Edge
  • Level
  • Pencil & Paper

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Once we receive your tub measurements, we will build your custom

bathtub conversion kit and ship it to you within 48 hours.

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Whether you are a do-it-yourselfer, contractor, or handyman, this page will give you all the information you need to install our bathtub to shower conversion kit.  Watch the installation video for a step-by-step demonstration.  Then scroll down to the Bathtub Measurement Instructions, and the Installation Instructions sections below for detailed descriptions of the process.  


We offer complete support to our customers and their installers via telephone and email.  If you have any questions about installing our step through

bathtub conversion kit, please feel free to contact us!

Measure Most Tubs in 4 Easy Steps!

  1. Measure Depth of Cut
  2. Measure Width of Cut
  3. Measure Top Thickness of Tub
  4. Measure Bottom Thickness of Tub
  5. (If Applicable) Measure Offset of Tub
  6. (If Applicable) Measure Curved Tub

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INSTALLATION VIDEO

Click below to watch

​​Bathtub Measurement Instructions

2.  Measure the Length of the Cut - See FIGURE 2
          A.  Determine the location of objects which may interfere                 with the use of a saw while cutting, such as the toilet                   or cabinetry.
          B.  The opening may be in the center or offset to either                     side of the tub.  If you would like to offset the                               opening, stay at least 12" away from the end of the                       tub.
           C.  Make a start mark on the top edge of the tub.                                Measure along the top edge of the tub to the length                      you want the opening, then place a finish mark. 

1.  Measure the Depth of the Cut - See FIGURE 1
          A.  Place a straight edge across the top of the tub.
          B.  Measure from the bottom center of the tub to the                         bottom of the straight edge.
          C.  Deduct 3" from that measurement                                                   (Ex: 12" tub depth - 3" = 9" deep cut).

4.  Measure the Bottom Thickness of the Tub - See FIGURE 4
           A.  On the inside of the tub wall, in line with the start                                  and finish marks, measure down the depth of the cut.
           B.  Place one end of a level on this mark, level up                                        vertically, and measure from the level to the outside edge                    of tub. 

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Convert Your Tub by T. Kister  |  480-255-1689


If you have a standard tub with no Offset and your tub is not Curved, you are finished taking measurements!  Please fill out the form and submit so that we can begin building your custom kit right away!  


If your tub has an Offset on the outer wall or the outer wall is Curved,

please follow the appropriate step below.

  6. Measuring a Curved Tub (if Applicable) - See FIGURE 6
             A.  Take Depth, Width, Bottom, and Top measurements as outlined in Steps 1 - 4 above. 
             B.  Set straight edge on top of tub at 90 degrees to left cut line and right cut line.  
             C.  Measure distance from wall of the tub to inside edge of the straight edge.

5.  Measure the Offset (if Applicable)  - See FIGURE 5
            A.  An offset is a raised, decorative pattern on the outer wall of the tub.  If the offset is running                             horizontally along the tub wall, it will cross the vertical cut lines.  
            B.  Measure from the top of the tub, down to the center of the offset.
            C.  Then measure how far the offset protrudes from the outer wall of the tub. 
            D.  Make a note of the Offset measurements with reference to the Illustration it matches.


  1. Unpack the kit.
  2. Set the 1/8" brown hard boards aside, these are part of the template. Set the four metal angle brackets aside, these are your mounting brackets.
  3. Remove the screws from the ends of the base plate, don't discard.
  4. Place the base plate on a smooth, solid surface with the 1/8" grooves up.
  5. Insert the 1/8" brown hardboards into the grooves. Flush the ends of the hard board with the ends of the base plate marked left, the hardboards will extend past the right end of the base plate 1 1/2"
  6. Make sure the hardboards are fully inserted into the grooves
  7. Place the assembled template over the tip edge of the tub, and mark the inside bottom length of the template, aslo make a short vertical mark at the left and right inside bottom corners of the template.
  8. Keeping the template level, mark the outside bottom, and the outside left and right vertical lines.
  9. Mark the top rail of the tub wall, on the ends of the template that protrudes past the base plate, place a straight edge from the inside template board to the outside template boards, and mark the top rail.
  10. Remove the level, and tip the template to the outside of the tub, so the template board is touching the inside wall of the tub. Mark the left and right inside vertical lines.


Cutting the tub


There are four basic types of tubs. It is recommended that you wear suitable eye, ear, face and respiratory protection when cutting them. I will address these tubs in 3 separate categories. On all types of tubs, I suggest cutting the inside wall of the tub first, then the outside wall of the tub, then the top rail of the tub.


  1. FIBERGLASS AND PLASTIC TUBS.
    A RECIPROCAL (SAWZALL) OR A MULTI SAW (USES A HALF MOON BLADE THAT OSCILLATES RATHER ROTATES) WORKS WELL ON THESE TUBS.
  2. LIGHT WEIGHT METAL TUBS
    A RECIPROCAL (SAWZALL) WITH A METAL CUTTING BLADE
  3. CAST IRON TUBS
    ANGLE HEAD GRINDER WITH A .045 THICK CUTTING WHEEL. THIS SHOULD BE DONE BY SOMEONE FAMILIAR WITH OPERATING A GRINDER.


Checking the cut


  1. Remove the portion of the tub that has been cut out.
  2. Check the four bottom corners for any material left that prevents them from being good, clean corners.


Mounting the 4 metal angle brackets


These mount on the inside of the bottom horizontal walls, 2 on the inside wall, and 2 on the outside wall. It isn't critical exactly where these are mounted on the walls, but try to stay fairly close to the left and right ends. Use LOCKTITE TUB AND SHOWER SURROUND ADHESIVE and mount with the bracket facing in and flush with cut.


Assembling the conversion kit


Assemble the left vertical plate to the base plate with the screws provided. You should still be able to see the mark, "left" on the vertical plate after attaching it to the base plate. Repeat this procedure with the right plate.


Installing the conversion kit


  1. Set the kit into place, and check for fit. Make any adjustments that are needed.
  2. Remove the kit and apply LOCKTITE TUB AND SHOWER SURROUND ADHESIVE to the top of the 4 metal brackets.
  3. Reinstall the kit.
  4. Use DAP TUB AND TILE ADHESIVE CHAULK (WHITE) to finish the edge between the tub and the conversion kit
  5. Using a smooth damp cloth to finish the chaulk will give you a much better finish



LET SET FOR 24 HOURS FOR ADHESIVE TO DRY

CONGRATULATIONS, YOU'RE FINISHED!