πŸ”² Why natural stone floors will usually be higher than neighboring flooring


Thank you for opening this email. I wish you the best 3-day weekend and please take a bit of time to appreciate the meaning of Memorial Day. Until next month...

In this issue:

  • wood plank subfloors
  • minimum structural requirements for floor construction
  • marble flooring and a second layer of plywood

A Disappointing Detail about Natural Stone Floors

I wrote about floor structure this month but neither article deals with how to handle a natural stone floor like marble, travertine, limestone, or slate.

Requirements for floors are different for natural stone than they are for tile.

Not only do natural stone applications need to be engineered stronger but they also require an additional layer of plywood installed over them to meet standards set by the Natural Stone Institute.

Further, it doesn't matter if you install Ditra, cement board, or Hardibacker over the subfloor. None of those count as a structural layer like plywood does.

The negatives

The big downside of this, besides the additional labor and material costs, is that your floors are almost certainly not going to be flush with one each other when going from one type of flooring to another.

That being said, I'm aware that there are a good many marble floors installed without this second layer of plywood underlayment.

Also, I'm sure there are several examples that seem in perfect condition.

Failure is rarely guaranteed. But the risk of failure is certainly is lessened when industry standards and proper procedures are followed.


New at DIYTileGuy

​Does your Floor Meet Minimum Structural Requirements for Tile?​

Not every floor can accept tile flooring and some of the homes that can't are fairly new. This article tells you what the typical industry standards are and gives a breakdown of how to use the Deflectolator over on the John Bridge Forum.

​Here is how you can lay tile over an old wood-plank subfloor​

This was the original article I was working on before I realized I should probably write the one above also. It deals with a very specific type of floor construction that isn't 'normal' but I see that it comes up quite a bit in questions.

If your floor is more commonly framed, or over concrete, this article won't apply to you.


Have a meaningful Memorial Day Weekend.


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