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Unread 05-28-2020, 05:06 PM   #31
ss3964spd
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Quote:
Originally Posted by Vignesh
...why would a hardiboard on top of plank isolate movement just like plywood on top of plank?
Because the manufacturer does not state that installing Hardie directly over planks is an acceptable method, it suggests it wouldn't. That your previous tile installation survived with just such an underlayment is probably an aberration. The manufacturers test a lot of configurations, then determine the best installation method that will virtually assure success in all circumstances. It amounts to a CYA exercise for them; claims wise and reputation wise. IMO, natch.

Installing anything outside of manufacturers and industry recommendations/guidelines is a risk. Can it work? Sure. I installed tile directly on plywood in my laundry room 4 or 5 years ago and it's still there; no cracks and all are still stuck, the grout isn't disintegrating. My rational for taking the short cut was "it's juuust a laundry room". Will it still be in great shape 5 years from now? I dunno.

If I'd done it correctly I would know.
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Unread 05-30-2020, 02:49 PM   #32
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Thanks Dan . you are correct. Doing it the right way makes sense.

Your reasoning and to avoid the excess lip, im thinking i should rip out the plank subfloor, put in a 5/8" OSB and use hardiboard on top.

Let me know if you think thats not a good idea. Im ok for the excess work. i would take the safe approach instead. My joinst span is 14" between joists.
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Unread 05-30-2020, 04:05 PM   #33
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Vignesh, keep in mind also that there was a time when James Hardie did recommend installing his backer board over sawn board subfloors. He changed that recommendation years ago and I bet you can guess why.

Quote:
Originally Posted by Vignesh
My joinst span is 14" between joists.
That would be your joist spacing rather than the span and I would guess it's closer to 14 1/2" between joists, indicating a spacing of 16" on center.

You also need to know the unsupported span of your joists as well as the species and grade to effectively calculate the design deflection.

If you elect to remove the existing subflooring I would suggest you use nothing less than nominal 3/4" exterior glue, T&G plywood with no face of grade lower than C or a similar OSB product. I would not even consider anything thinner.

My opinion; worth price charged.
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Unread 05-31-2020, 06:13 PM   #34
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As an aside, unless Schluter has changed things up, light blue membrane is not Ditra. Could be a similar product, but I think if it was sold to you as Ditra, you got ripped off! Maybe I'm missing something.
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Unread 06-03-2020, 10:48 PM   #35
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no it wasnt DITRA. It was Dural, but i also have DITRA 1/8. I was just using Dural to show that I am off a lil. Both Dural and Ditra are 1/8 thickness
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Unread 06-03-2020, 11:08 PM   #36
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Sorry. Yes Spacing = 14". Unsupported span = 13 ft.

Current plank subfloor is only 5/8". I am afraid if I use 3\4 instead, I will go over the adjoining wedi board in the shower area.

i have to do some measurements to see if I really can go with a 23/32 T&G board + 0.42" hardi cement board and be at the same level as the Wedi Shower pan.

I am only thinking about removing existing subfloor so I can get pefectly level with the Wedi board (by avoiding DITRA). Else I don't think its worth the hassle.
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Unread 08-02-2020, 10:18 AM   #37
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Slight dip in new 3/4 subfloor

Hi All,
I am redoing our master bath with the intent on removing tub and going with curbless shower.

Floor outside shower = 10ft X 5 ft

I had plank subfloor, which i replaced with 3/4 Georgia Pacific T&G plywood, T&G running perpendicular to joists (14" spacing). The plan is to use hardie board on top and eventually tiles.

Tiles are porcelain LFT (9" x 47") throughout the floor in the direction you are seeing in the picture.

floor door to wall is level. I have a slight dip (1\8 in max) in the middle section you see in the picture.

What are my options?

1) Should I use a flexible SLC before laying CBU?
2) Lay the CBU and then do SLC
3) leave it like the way it is and back butter the tile to make up for the dip?

Please let me know your opinions. Thanks a bunch.

I live in Massachusetts btw.
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Unread 08-02-2020, 10:32 AM   #38
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With an 1/8” dip, don’t make yourself crazy over it. Use a bit more thinset in the area and tile on. Best to backbutter all the tiles for coverage and a bit thicker where you need to.
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Unread 08-02-2020, 11:26 AM   #39
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Did my post merge into one of my older threads??? Is this normal and happens automatically or is this done by mods to keep threads relevant and minimize new ones?
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Unread 08-02-2020, 11:51 AM   #40
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Cutting Large Format Tile to 2x2 mosaic

Hi All,

i have a conundrum.

I am laying 47" porcelain LFTs for bathroom floor. To tie in shower area look, I want similar looking tile for shower area floor. But its very hard to get the same looking in 2x2 mosaic tile format.

the guy at the tile shop suggested buy extra 47" LFT tiles and cut them into individual 2x2 mosaics.

Shower area = 15 sq ft (5 x 3).

Is this ok to do? apart from being a pain is there a downside to this?

Link to Tile -> https://www.tileshop.com/products/ba...saAq4dEALw_wcB

Thanks,
Vignesh
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Unread 08-02-2020, 12:11 PM   #41
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You new post got merged with your previous posts for this project, Vignesh, we like to keep all Q&A's regarding a single project in one place, helps everyone how contributes to have the big picture of the project.

We can rename your thread to anything you like, just let us know.
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Unread 08-02-2020, 12:17 PM   #42
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Cutting those big ones down into a bunch of little ones is doable, but obviously time consuming. All the cut tiles will end up with a very, very sharp edge, and unless your saw and blade are quite good those edges might have small chips in them. you'd want to set up some kind of "jig" for the saw so that all the pieces come out to the same size.
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Unread 08-02-2020, 12:17 PM   #43
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I was just worried about getting the right & more answer to my latest question.

If thats not a problem with this merge.. then im ok.

If its ok, can we rename the title to 'Dip in new T&G OSB subfloor'

Thanks
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Unread 08-02-2020, 12:20 PM   #44
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Sure you don't want something like Vignesh's Super Awesome Bathroom Remodel to End All Remodels? You can title the individual posts with something more specific.
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Unread 08-02-2020, 12:57 PM   #45
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lol... im way behind anyone else's remodel... but thanks for the suggestion.
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