Flooring and Carpeting/grout width


I have recently installed a new bath tub. The existing flooring is ceramic floor tiles. The tiles were installed up to the original tub. The replacement tub is appx. one inch narrower than the original tub. This left a gap between the tub and the existing tile. Should I fill thsi gap with sanded grout or some type of epoxy or syllicon sealant.

Hello and thank you for contacting The Grout Dye Company in NY.    

A 1" gap near the tub and floor can lead to problems down the road from moisture and water getting into the substrate.

If you have some of the old tile have thin strips of it cut on a wet saw and placed them in with thinset. Once it sets up grout the tile joint and the expansion joint by the tub.

This spot is considered an expansion joint since their is always movement from the floor and tub.

This is a common problem spot  for cracking grout, since the grout and tile is a non resilient material and doesn't flex as the tub and floor move.  It would be my suggestion to also caulk with Phenoseal or Silicone after the grout has dried in the expansion area.

Thank you;

Michael C. Malizia

The Grout Dye Company

Flooring and Carpeting

All Answers

Answers by Expert:

Ask Experts


Michael C. Malizia


I can answer questions about, Grout and ceramic tile restoration and installation. This topic generally focuses on new or old installations that have an existing problem. I can offer advice on how to correct common made installation mistakes. Such as, cementitious grout problems, efflorescence, ghosting, shading, and flashing. And tile installation problems such as, floor deflection, slip resistance, loose tiles, vapor transmission and many others. These are just a few of the problems associated with new tile and grout installations. I can also offer advice with restoring old tile and grout problems such as, sealer removal, re-sealing, grout re-coloring, grout repair, and caulking.


Have worked in many different phaces of construction since 1983, I am owner / operator of a Tile & Grout installation and restoration business. I am also a technical advisor for The Grout Dye Company. since 1995.

General studies

Past/Present Clients
Connecticut Stamford Hilton,Southampton hospital, Mcdonalds, Wading river hotel, Eastwind caterers, La pizzola, Setauket bagels, Sortsman kennels, Savinos resteraunt, Custom Building Products, Super-tec, Cancos, Southampton brick and tile, Tech, Dap, Poland spring water etc.

©2017 About.com. All rights reserved.