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Old 11-07-2012, 10:51 PM   #1
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What are my next steps?


Hello,

I ripped out some laminate pvc tile that was in my bathroom and plan to replace it with some higher end tile.

I bought Ditra (1/8") and plan to use the mortar recipes they provide (unmodified if I remember correctly)... but I need to know what to do about the current "flooring".

I have "underlined" the separation mark in the wood. Looks about 1/8" plywood over osb?

https://sphotos-a.xx.fbcdn.net/hphot...55700891_o.jpg

Do I rip this thinner wood off, and then lay the ditra over it? or just scrape the glue from on top and go over that? I'd prefer to have the height be as low as possible... but want to do it right.

Thanks,


Last edited by white25rs; 11-11-2012 at 11:48 PM.
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Old 11-08-2012, 04:55 AM   #2
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What are my next steps?


The 1/4" underlayment needs to be removed-----that subfloor looks like plywood to me--

If you will give us the floor joist size---and spacing---and unsupported length---someone will check the deflection chart for you.

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Old 11-08-2012, 10:54 AM   #3
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Quote:
Originally Posted by oh'mike View Post
The 1/4" underlayment needs to be removed-----that subfloor looks like plywood to me--

If you will give us the floor joist size---and spacing---and unsupported length---someone will check the deflection chart for you.
Can you describe Unsupported Length?

Thank you
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Old 11-08-2012, 05:32 PM   #4
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What are my next steps?


Typically a floor joist starts on top of the foundation and rests on a center beam in the house----from beam to foundation is the unsupported length.

In a narrow house they might run from foundation to foundation with out a center support.
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Old 11-08-2012, 06:37 PM   #5
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What are my next steps?


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Originally Posted by oh'mike View Post
Typically a floor joist starts on top of the foundation and rests on a center beam in the house----from beam to foundation is the unsupported length.

In a narrow house they might run from foundation to foundation with out a center support.
Thanks, Mike.

I went into the crawl space and found the following:
Longest (that I saw) unsupported length- approx 8 feet (+/- 8 inches or so)
Spacing- 36"
Joist width- I was unable to truly see any joists due to the insulation... What I was seeing may have been a piece of trim to hold the insulation up, or it was the joist, but it was 3" wide.

Here are some pics. The pic of the crawlspace hatch- the tongue and groove wood that is there... I think that runs the whole house. In the bathroom pic I took it from another angle, and you can see some additional wood. Might be the frame for the vent, but I believe the tongue/groove runs the whole house... I remember the inspector saying it was a strong floor

https://sphotos-a.xx.fbcdn.net/hphot...09150222_n.jpg

https://sphotos-a.xx.fbcdn.net/hphot...26582761_n.jpg

https://sphotos-a.xx.fbcdn.net/hphot...18211184_o.jpg

Appreciate any input

Thanks!!

Last edited by white25rs; 11-08-2012 at 06:41 PM.
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Old 11-08-2012, 06:46 PM   #6
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Sorry--I can't see much in the photos-----

36 between floor joists id unusual--but not unheard of---is this a Lindahl cedar home kit by any chance?

That thick tongue and groove looks familiar----
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Old 11-08-2012, 06:49 PM   #7
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Originally Posted by oh'mike View Post
Sorry--I can't see much in the photos-----

36 between floor joists id unusual--but not unheard of---is this a Lindahl cedar home kit by any chance?

That thick tongue and groove looks familiar----
Hmmm, yeah wish I had more... / could take better ones lol

I'm not sure. Just bought the place and am in the middle of de-trashing it

Anyone else have any input? or could use the information with the deflection chart??

Thanks
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Old 11-08-2012, 07:12 PM   #8
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I can't do a deflection without the floor joist size---distance between the joists---and the unsupported span--

You gave the unsupported span---8 1/2 feet

and the spacing---36 inches---

But not the actual joist size---

Let's see what another floor guy (or gal) has to say----
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Old 11-11-2012, 06:14 PM   #9
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What are my next steps?


Well, I ripped out the 1/4" underlayment, and found another layer of wood. It looks like this was cut out and replaced around the toilet and shower area in the past. I assume I have to rip this out too?

https://sphotos-a.xx.fbcdn.net/hphot...82707617_n.jpg

It sucks because this is what I have to work with: (after ripping out the underlayment and my hallway wood floors)
https://sphotos-a.xx.fbcdn.net/hphot...33027005_o.jpg

What is that? 3/8"?
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Old 11-13-2012, 12:00 AM   #10
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What are my next steps?


Here's the dumbo deflection chart . Put your face on the floor and have you biggest buddy walk over the area in question , if it moves more than maybe 1/16 th then don't do it , or get more advice , i have seen this cause tile to come loose , I got the sale nailing hardwood down , but they weren't happy with the tile guy , The one thing for sure is when some one walked over it when I watched the floor flexed a good strong 1/8 inch , any dumbo shoulda seen that , Thats why I call it the dumbo felxation test . If the floor is really solid and barely flex's then I wouldn't vworry , all floors flex a little , there is a tolerance when the load is spread onto a tile , Thats what ohmike is trying to get you too , But Don't just do it without knowing , it will be a tear out in a couple years , Put some nice vynil in and call it a day

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