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Installing a bathtub on concrete floor

It would appear that I do not have sufficient room under the bottom of the tub drain to install the abs "T"drain and overflow. Do I need to elevate the tub approx. 3" in order to do this? This is a basement installation on a concrete floor with the drain pipe roughed into the floor.

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Other than chopping out more concrete.elevating the tub is probably your only other solution. I would think 2" would be adequate.
Hope this helps.

Posted on Sep 07, 2015


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When filled with water, the tub edges pull away from the tile, installed per manufacture's direction, is this normal?

No, it's not normal. I suspect you missed one of the early steps in the installation. The bottom of the tub needs to be fully supported. We often use mortar to set the bottom of the tub so it doesn't move. If you did that, the whole floor may be sagging under the weight. We see this sometimes in houses built to minimum code.

Jul 15, 2015 | Kohler K-1125-RA-0 Archer 6 Soaker Bathtub...


How to Install a Bathtub

Anyone can install a water bathtub, but to do it right so that it will last a lifetime takes some time to make sure that it is installed properly. If installed correctly the bathtub you install will be well supported and will not experience the stress that ones that are not installed properly will experience.


The first part is to make sure that the space is exactly the same size as the tub or tub/shower unit. Leave the end wall out till the unit is in place and then fasten it in place.
If you take the time to notch out for the lip on the tub or the tub/shower unit, your dry wall will not have to bow out over it. Place the unit in place and mark the studs, then chisel out ¼” deep so that the tub sits back and the lip is flush with the face of the studs.

Once you have the unit “fitted” exactly to the space, you are then ready to install the bathtub or tub/shower unit. By this I mean that I “set” the unit in a bed of mortar to make sure that the bottom of the unit and the unit it’s self cannot possible move or flex when weight is in it. To do this you need to make a bed to set the tub into.

Depending on the size of the unit, usually one bag of mortar mix will be sufficient for one fixture. Mix the water with the mix right before you are ready to set the unit. Make sure that the mix is stiff enough so that when you place it on a pile it will stay and not run. Now place the mortar in the center under where the unit will set. Place a sufficient amount so that you will have to press down on the unit to “set” it into the mortar.

Carefully place the unit in place and gently press it into the mortar until it is sitting level. You can now place a couple of screws into the lip to hold it in place until the mortar gets hard. After a few hours the mortar will be hard and will fully support your unit. The bottom of the unit will not be able to flex at all and your unit will be on the road to outlasting you!

You can now finish the remaining wall, then trim the unit and finish the walls. Plumbing can now be installed. Remember to provide access to the plumbing just in case of future problems.

on Feb 27, 2010 | Plumbing

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I would like information on steps to remove bathtub and install pre fab shower

This is a fairly big job but can be done if you have the right tools and a little bit of time....... Depending on the existing tub material (cast iron,fiberglass, tin type ). You will want to remove faucet trim(handles,spout) first. Then the over flow plate on tub,as well as drain in the bottom (this will require a drain removal wrench or pair of needle nose pliers and screw driver, and some strong arms).After this is done remove tub unit , if the unit is a cast iron unit a good sledge hammer will work as you will need to break into halves to remove unless your trying to save tub and provided you can then get the unit out the door in one piece...... Caution, protect body and eyes in this process, flying pieces of cast iron can do some damage to body......cutting tub will take several blades and take quite a while to do......The next step depends on the location of faucet and if you are replacing the tub faucet or going to use the existing faucet.... I would recommend a new faucet because if this is going to be a shower only you may want to raise the faucets so they will be easy to operate without having to bend..Depending on the model pre-fab (two piece,three piece) unit you wish to install you may need to prep the drain to make sure it will fit your new installation. Let me explain... most tubs have the drain located at the right/left end of tub and the showers are located in the center of the unit thus leaving you to relocate the drain. If house is on slab it means a little jack hammering the concrete to provide this, if the floor is a conventional it means re-routing the drain to the center.......once all this is accomplished you are ready to install unit base,connecting drain. Next you need to get the faucet located to the right height or be able to get to the back side of the shower and remove the existing faucets and replace them after you install surround.....turn off water supply before removing faucet..... A sturdy surround will make for a less involved support system around shower area.Be sure to leave enough space between studs for faucet attachment. Sounds like a lot of work and it is but after its done you will have a great bath shower..... hope this was helpful.... sorry this only dealt with the plumbing aspects of the job......

Sep 05, 2011 | Home

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I am interested in the Eljer Gibraltar tub. What does the AFR stand for? Also, what is the correct part no. I would need to order to get a tub with the drain and overflow on the left side as you face the...

Right hand and left hand refer to where the drain is located to where you are standing in front of the tub.
if you are standing in front of the tub and the drain is on your right hand then it is considered a right hand tub.

Jan 19, 2011 | Eljer Gibraltar AFR Right-Hand Outlet...

2 Answers

Basement plumbing. I want to put in a basement bathroom and my plumbing drain from the house is 4' from the basement wall. I need to put in a sewer basket and venting. any diagrams to follow?

My suggestion is to build up the floor where the tub will be maybe 12" above original floor and u can make a couple steps up to the tub the whole length of tub

Dec 10, 2010 | Home

1 Answer

The tub drain is installed but it is leaking around the flang not the stopper itself? i am assuming it is leaking outside the drain ? which appears to be in the room beneath it.. 2nd floor tub.... Do...

If it is leaking from around the flange then you will need access to the under side of the tub drain to 1) tighten the drain connection or 2) replace the tub drain connection or 3) remove the drain, clean it and replace it again properly with the rubber washer and plumbers putty.

Nov 06, 2010 | Home

1 Answer

Bathtub installation

Now I see the wood stud is added support and the tub should rest on it. though it is not to hold the tub up. Like a man using a cane the cane doesn't keep a man standing by itself. Rather it helps a person be more stable that's what the stud does. Set at height for a level tub.

Here is a trick as well for supporting the back of the tub (Shimming) Get some of the expandable foam. Set everything in place like the wood ledge when you have everything in place and tub pre-fitted. Remove tub and place a line of foam along back side. Place tub in place and when foam expands and dries it will become your perfect shim. Hope this helps, thanks for using FIXYA. Good luck, Jeff

Apr 08, 2010 | Maax Home

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Can bottom of bathtub collapse

The answer is yes.Most of your moble homes have poly or fiberglass tubs with litttle or no bracing under them and the floors are made out of a fiber type board. When they get wet they warp, crumble and fall apart, so if water has gotten under the tub there isn't much of a floor under it. But yes it can be repaired. She will have to remove the old tub and the wall board around it And probably have that portion of floor replaced.

Dec 02, 2009 | Home

2 Answers


The tub should just sit on the floor, and caulked around to seal out any water. If it as a fiberglass tub, you might want to put some grout under the bottom to help support it.

Apr 29, 2009 | Home

1 Answer

Install bathtub without existing drain

it is generally not allowed under the water regs to discharge waste water into anything other than a drain.I would suggest you install a discharge pump, typically the saniflow type which will allow you to run the waste across the room and discharge the waste into the vanity basin drainage.Should you choose to install this be aware of the waste pipe configurations shown by the instructions

Mar 20, 2009 | Kohler Overture 5ft Vikrell Bath -...

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