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Can you install floor tile over padding? The floor tile is standard tile that will require grouting.

I'm concerned the tile and/or grouting will crack due to the padding. The purpose of the padding is to reduce the noise of foot traffic in the room below. Sound dampening padding is fairly thin, and not nearly as thick as carpet padding.

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    I think to give a fully informed answer we'd need to know exactly what product the pad is (if it's an existing condition and you don't know what it is, the answer is a resounding no). Also the kind of grout you're intending to use(sanded/unsanded, cememtitious/epoxy) could be a factor. – user23534 Nov 26 '14 at 8:10
  • @paperstreet What kinds of grout are more resilient to motion? – RockPaperLizard Nov 26 '14 at 11:57
  • Sanded epoxy I think. I'd have to look it up to be honest. – user23534 Nov 26 '14 at 14:59
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In almost all cases this is a no. There are waterproofing systems you can use but not flooring pad. When you lay your tile the pad will move a little and cause issues. In essence with a pad you are creating a giant floating tile floor.

Note: To reduce sound from the floor you want to do two things.

  1. Build up the subfloor. Adding an inch of plywood plus 1/2 inch durarock will take out a good % of any sound.
  2. Add insulation in the cavity below floor.

The padding you are thinking about leaving might reduce sound by 1%. Sound is due to weight disbursement - generally speaking. A 200 pound person running around will make sound. 10 pounds of padding underneath them will have no affect. I am sure someone can comment on the science of this. But the two things you want to do are create a buffer (pad is thin and almost no buffer) and keep your joists from moving (pad does nothing at all there).

  • Are you sure? The IIC rating system claims that products meeting higher IIC standards will reduce sound by much, much more than 1%. – RockPaperLizard Nov 25 '14 at 21:59
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I've used a firm cork subfloor material under large format tile which, installed over 1" marine quality plywood and 1/4" self-leveler, lasted for the last eight years with no issues. I will mention that a friend who is a guest of ours often tips in at over 450lbs and has done no damage. I did use an epoxy type grout designed to have slight give. My point? Yes there are new products out there that are getting better, some of the corrugated style noise dampening total area seal products also serve to dampen some noise. Check manufacture recommendations for noise reduction. It will be referred to as a number followed by 'db' rather than a particular percent since they have no information on your structure or type of noise...even this is a bit seductive when researching because of so many acoustic properties in different homes and the hubris of many manufacturers.. good luck!

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Subject to both the tile and underlayment manufacturer's installation requirements, yes.

It is common for such manufacturer's to have technical support departments and contacting them will often provide a wealth of expert advice.

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