Subfloor suitability question

stoneda7086 · 03-07-2011, 06:12 PM

I'm re-starting my prior thread for accuracy following more research and prior advice on here..

The question is if my subfloor can support porcelain tile/backerboard etc. Right now it's vinyl. Here is the data I have. I'm interested in better understanding the acceptable industry standard..
a. Subfloor is 23/32", OSB
b. Pre manufactured I-Joists spaced 19.2 oc, manufactured by International Paper. These joists are labled IPI-200. 9 1/2" top to bottom of the joist. I've viewed a document that I think shows them as L/480 live load, with a maximum simple span of 14' 11".
d. The furthest unsupported section measures 13' 7"

Can anyone confirm or deny if it's suitable for installation of porcelain tile and the accompanying backer-board based on the information I've provided? I've never installed tile and want to verify I'm not messing-up.

JazMan · 03-07-2011, 08:47 PM

Your framing should be fine for porcelain tiles. I will assume it'll meet L480 at 40/10 lb. per sq. ft. live/dead load, which is common min. code most places. Tile generally needs L360 for both joists and subfloor deflection. I like to specify loads of 50/20 though. You should still be OK for the joists.

Many if not most concrete backer unit manufacturers have ratings for 19.2 o.c. joists too. Wouldn't hurt to add more ply though. What backer are you using?

Jaz

Bud Cline · 03-07-2011, 08:53 PM

Is this the same thread you started "kitchen tile job planning" and the one I spent all that time on trying to help you and now you have just dumped that thread and started this one???
Kitchen tile job planning.. ? ..

Or...is it this one in which I also have a sizeable investment?
Tile subfloor - clearance issue

Just askin"?

stoneda7086 · 03-08-2011, 05:09 PM

Yes, it's a continuation from "kitchen tile job planning". And again, thank you very much for your time/help. Hopefully, I didn't violate any forum rule by re-posting, making the title accurate and adding information being my intent.

I had plannned to use the 1/4" hardiebacker.

Bud Cline · 03-08-2011, 06:19 PM

Quote:

Hopefully, I didn't violate any forum rule by re-posting,

No, no real violation I'm aware of other than it really screws up the continuity of a thread.

You might pick one thread of the three and stay with it as long as the topic doesn't change.

03-07-2011, 06:12 PM	#1
stoneda7086 Newbie Join Date: Feb 2011 Posts: 11	Subfloor suitability question I'm re-starting my prior thread for accuracy following more research and prior advice on here.. The question is if my subfloor can support porcelain tile/backerboard etc. Right now it's vinyl. Here is the data I have. I'm interested in better understanding the acceptable industry standard.. a. Subfloor is 23/32", OSB b. Pre manufactured I-Joists spaced 19.2 oc, manufactured by International Paper. These joists are labled IPI-200. 9 1/2" top to bottom of the joist. I've viewed a document that I think shows them as L/480 live load, with a maximum simple span of 14' 11". d. The furthest unsupported section measures 13' 7" Can anyone confirm or deny if it's suitable for installation of porcelain tile and the accompanying backer-board based on the information I've provided? I've never installed tile and want to verify I'm not messing-up.

03-07-2011, 08:47 PM	#2
JazMan Tileguy Join Date: Feb 2007 Location: Troy, Michigan Posts: 3,287	Subfloor suitability question Your framing should be fine for porcelain tiles. I will assume it'll meet L480 at 40/10 lb. per sq. ft. live/dead load, which is common min. code most places. Tile generally needs L360 for both joists and subfloor deflection. I like to specify loads of 50/20 though. You should still be OK for the joists. Many if not most concrete backer unit manufacturers have ratings for 19.2 o.c. joists too. Wouldn't hurt to add more ply though. What backer are you using? Jaz __________________ Tile 4 You LLC Troy, MI KERDI Shower Specialist ... DITRA Installs ... Product-Method suitability consultation. I have NEVER made a mistake, I thought I did once...........but I was wrong! - PRODUCTS ADVERTISED WITHIN MY POST ARE NOT ENDORSED BY ME!

03-07-2011, 08:53 PM	#3
Bud Cline Tileguy Join Date: Mar 2006 Posts: 9,104	Subfloor suitability question Is this the same thread you started "kitchen tile job planning" and the one I spent all that time on trying to help you and now you have just dumped that thread and started this one??? Kitchen tile job planning.. ? .. Or...is it this one in which I also have a sizeable investment? Tile subfloor - clearance issue Just askin"? Last edited by Bud Cline; 03-07-2011 at 08:55 PM.

03-08-2011, 05:09 PM	#4
stoneda7086 Newbie Join Date: Feb 2011 Posts: 11	Subfloor suitability question Yes, it's a continuation from "kitchen tile job planning". And again, thank you very much for your time/help. Hopefully, I didn't violate any forum rule by re-posting, making the title accurate and adding information being my intent. I had plannned to use the 1/4" hardiebacker.

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Subfloor suitability question