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The necessity of subflooring? PaPaPeng 07-30-2007
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Posted by PaPaPeng on July 30, 2007, 4:16 pm


I have a 28 year old house. The linoleum need to be replaced in the
bathrooms and the front door landing. I intend to use 13" x 13"
ceramic tiles. A neighbor who had already done his recommends that I
add a plywwod subfloor so that the base will be rigid. This is to
prevent the tile cracking. I would prefer to glue the tiles directly
to the existing floor. 1. to keep the floor thickness low, 2. skip a
lot of extra work, 3. In 28 years the floor seems very stable and
does not creak or "bounce."

Is a subfloor absolutely necessary? If so how does one fasten this
subfloor to the existing floor - glue, nail or screws?

Special 468x60
Posted by Robert Allison on July 30, 2007, 6:02 pm
PaPaPeng wrote:
>
> I have a 28 year old house. The linoleum need to be replaced in the
> bathrooms and the front door landing. I intend to use 13" x 13"
> ceramic tiles. A neighbor who had already done his recommends that I
> add a plywwod subfloor so that the base will be rigid. This is to
> prevent the tile cracking. I would prefer to glue the tiles directly
> to the existing floor. 1. to keep the floor thickness low, 2. skip a
> lot of extra work, 3. In 28 years the floor seems very stable and
> does not creak or "bounce."
>
> Is a subfloor absolutely necessary? If so how does one fasten this
> subfloor to the existing floor - glue, nail or screws?

Not knowing the age of your home, I will assume that it is of
recent vintage. If so, then the floor is probably 3/4 inches
thick. That is too thin for tile. Even though you may not
notice any flexing, it does flex. And it will flex too much
for tile.

You need to add the additional 1/2" both screwed and glued to
the existing flooring for a total of 1-1/4". This should give
your floor the stability it needs for tile.

If you don't, then the tiles or the grout or both will
probably crack.

Look here:

http://tinyurl.com/2nd7fa

--
Robert Allison        
Rimshot, Inc.
Georgetown, TX

Posted by Steve Barker on July 30, 2007, 8:07 pm
If you use your existing floor, just use a portland cement based tile
adhesive. Not the cheap crap that comes in a tub. You'll have no cracking.


s


>
>
> I have a 28 year old house. The linoleum need to be replaced in the
> bathrooms and the front door landing. I intend to use 13" x 13"
> ceramic tiles. A neighbor who had already done his recommends that I
> add a plywwod subfloor so that the base will be rigid. This is to
> prevent the tile cracking. I would prefer to glue the tiles directly
> to the existing floor. 1. to keep the floor thickness low, 2. skip a
> lot of extra work, 3. In 28 years the floor seems very stable and
> does not creak or "bounce."
>
> Is a subfloor absolutely necessary? If so how does one fasten this
> subfloor to the existing floor - glue, nail or screws?



Posted by Big_Jake on July 31, 2007, 12:02 am
wrote:
> If you use your existing floor, just use a portland cement based tile
> adhesive. Not the cheap crap that comes in a tub. You'll have no cracking.
>
> s
>
>
>
>
>
> > I have a 28 year old house. The linoleum need to be replaced in the
> > bathrooms and the front door landing. I intend to use 13" x 13"
> > ceramic tiles. A neighbor who had already done his recommends that I
> > add a plywwod subfloor so that the base will be rigid. This is to
> > prevent the tile cracking. I would prefer to glue the tiles directly
> > to the existing floor. 1. to keep the floor thickness low, 2. skip a
> > lot of extra work, 3. In 28 years the floor seems very stable and
> > does not creak or "bounce."
>
> > Is a subfloor absolutely necessary? If so how does one fasten this
> > subfloor to the existing floor - glue, nail or screws?

If he has 24" OC floor framing, he can use the $50 / bag thin-set, and
still have big issues.

JK


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