How much grout cracking is too much?? [Archive] - Ceramic Tile Advice Forums - John Bridge Ceramic Tile


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02-20-2008, 06:37 PM
My floor is built on 2x10's ; 16ft long, will they be okay or will they flex once ceramic tile is layed down? Thank you

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02-20-2008, 06:48 PM
Hi there 5speed. What is your spacing between joists and subfloor
material and thickness of the subfloor?

02-20-2008, 07:09 PM
the 2x10,s are spaced 16inch on center and are 16ft long the floor is plywood and with the backer board is 1 inch combine

02-20-2008, 07:14 PM
did yo go to the Deflecto ( page to see if your floor passes to be able to receive tile ?

02-20-2008, 07:19 PM
The Deflecto says NO.... No Ceramic ..NO Stone :)
Are you sure of the unsupported length?

02-20-2008, 07:19 PM
yes but I have white pine on the calculator it said syp?

02-20-2008, 07:26 PM
SYP = Southern Yellow Pine
SP = Southern Pine
I, personally am not familiar with the structural characteristics of white pine vs yellow... We may need Engineer Bob.. :)
Me thinks, (guess) not much difference in this situation..

02-20-2008, 07:39 PM
White pine would be weaker by far, I have never seen white pine used as structural framing. Are you sure it's white pine????

08-29-2008, 03:20 PM
my kitchen floor was tiled about 120 days ago and I see some small [Hair] lines about 3-4 inches where the grout meets the tile, maybe too diff spots like that, is that a problem??


08-29-2008, 03:25 PM
Any details on how the floor was installed? Which backer board used, thinsets used above and below the board, joints taped, tile type, grout type, floor construction, etc?

Cracking grout generally indicates there is some sort of movement somewhere. It might be a really big deal, or it could be just a spot that happened to crack a little.

08-29-2008, 04:11 PM

is this related to your "Kitchen Floor - Ceramic Tile" thread ??

I guess you didn't listen to what the Deflecto said. :sick:
5Speed, The Deflecto says NO.... No Ceramic ..NO Stone

08-29-2008, 04:27 PM
Uh oh.The cracks are movement and they will only get worse.

08-29-2008, 04:35 PM
Deflection = L/205

Yup. Joe, I'm aftaid them cracks just a preview of coming attractions. :crap:

Fox Flooring
08-29-2008, 04:38 PM

08-29-2008, 08:06 PM
I have to agree. Cracks this early on probably means trouble.

08-30-2008, 03:16 AM
the 2x10s are yellow pine and since the first problem they screwed and glued 2x8 yellow pine to them and regrouted and fixed any loose tile now its been 4 mounths and I have 2 spots that have about 4 inches of hair line crackes where the groute meets the tile, so back to my question, will this be a problem??? early I said I had white pine ,I was wrong its yellow but now its 2x10,s with 2x8 glued and screwed to them

08-30-2008, 07:26 AM
Welcome, 5SPEED. Please put a first name in a permanent signature line for us to use. (UserCP/Edit Signature) :)

Were the 2x8 sisters installed the full length of the existing joists?

On the top or bottom of the joists?

Were the existing joists raised at all in the center during the installation of the sisters?

08-30-2008, 02:16 PM
yes the 2x8,s ran all the way across like the 2x10s, they screwed the one end of the 2x8,s to the 2x10,s and pushed it up snug, or up a smigen then screwed and glued all the way down, side by side, yes they did every joist in the kitchen this way

Thanks, Joe

08-30-2008, 04:19 PM
I'm surprised you didn't crack more of the joints, Joe. Good eye-dee to sister them joists before you do your tile installation, not nearly such a good eye-dee after the tile's in.

Any grout cracking is a technical failure of the installation, but, depending upon your current situation and relationship with this installer and tolerance for life disruption, you may wanna wait to see how this floor looks in a year or so.

No more cracks, you may wanna accept the installation. More cracks, might wanna kill take action against the tile guy if he won't replace it for you.

My opinion; worth price charged.

08-30-2008, 05:03 PM
I have used an acrylic caulk that is similar to the tile color to hide cracks in tile. It works GREAT!

08-31-2008, 04:51 PM
thank you !!!!!!!!!!!!!! that was what I was thinking, 1 year or maybe a little more will tell, also the same guy built me a garage and I owe him a good hunk of money, so im safe and he will have to wait a bit for his money, maybe 12 months, and yes he built the house too

Thanks, Joe