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Plumbing in the Home/feet under full apron cast iron tub


USA; Virginia

I pulled and relocated a full apron 5 ft alcove cast iron tub.
It is a 1951 American Standard, original to the house.

I have set the tub with a ledger board along the 5 foot wall. In the new installation, the cast iron basin is a little over and inch off the floor deck at the low end and has no feet. There are some tabs on the sides at the middle that are about 1 1/2" off the deck and "feet" at the back about 3/4" above the floor deck.

There was no indication under the original installation that the "feet" under the basin were supported with shims. I did not look specifically for marks on the floor boards. I assumed the tub was fully supported by the ledger along the 5 foot wall. There is a possibility the "feet" at the back end of the tub were on the 1x8 subfloor because the front drain was not over any subfloor and could have been actually below the level of the floor bringing the back "feet" into contact.

Looking at installation instructions on new cast iron tubs, that are not a match for what I have ... there is no match for what I have, I see that the space between the little feet on the bottom and the floor is supposed to be shimmed and they do not call for a ledger board at all.

All that said, are these side tabs and "feet" supposed to have something fitting under them?
How would these points be shimmed in a retrofit where the apron blocks all access?

Thank you

I am not sure. If it were me I would contact American Standard. Send then a picture and they will likely be more than happy to point you in the right direction.
You cannot have to much support. The feet certainly have to rest on something of substantial strength but it also must be aesthetically pleasing if it is visible. Evaluate and calculate the weight and proceed accordingly.

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Cortez (cort) Cate


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Since 1972 a California licensed B-1 General Building Contractor, C-36 Plumbing and C-16 Fire Sprinkler Contractor; also installing and servicing Heating, Air Conditioning and Sheet Metal operating as C and C Building and Plumbing, California State License 279516. In 1995 I downsized the company to become semi-retired. Still I remain active in the construction industry. As head of a company I placed personnel and job safety as the number one objective followed closely by training and continuing education. Always seeking to stay informed of leading edge technology in the industry. Also I have spent several years as an Apprenticeship Instructor in the Pipe Trades Unions. Additionally I am a certified OSHA instructor.

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