Ceramic Tile Advice Forums - John Bridge Ceramic Tile

Welcome to John Bridge / Tile Your World, the friendliest DIY Forum on the Internet


Advertiser Directory
JohnBridge.com Home
Buy John Bridge's Books

Go Back   Ceramic Tile Advice Forums - John Bridge Ceramic Tile > Tile & Stone Forums > Tile Forum/Advice Board

Sponsors


Reply
Thread Tools Search this Thread
Unread 02-23-2012, 12:18 PM   #1
mohamie
Registered User
 
Join Date: Feb 2012
Posts: 4
Deflect-O-Lator question

Hello my name is Mike. I'm new to the board and I must say, a great site and much information!

I lost my job and spending some of my free time remodeling my house. I have completely gutted a bedroom and half of the main bathroom. Replacing a split floor joist and a good amount of other joist due to what looks to be DIY hacking.

I present item #1 (picture bottom of post, left side)

Others that look like swiss cheese.

The floor joist are 2 x 8 16OC(most lol) 12 foot span.

After entering those numbers in the Deflect-O-Lator I received the dreaded 2 thumbs down for tile. Then it advised to post here if there was further questions.

I scoured the forums reading and noticed someone with a similar problem. One nice fellow posted a solution involving sistering floor joist glued and screwed together to get the required strength to be able to lay tile.

So let me set the stage. Older house with TG 2x flooring throughout. Bath room had sheet vinyl on top of 1/8 sheathing. Currently I'm down to the studs. Was planning on 3/4 TG OSB throughout the house. Carpet pad, carpet in the bedroom and hardie board/tile for the bathroom. After reading the forum I think I may need to reconsider the bathroom. I would like to lay some form of tile(not sure which yet) but it appears I need to stiffen up the floor first. I would like to keep the thinkness down in the bath room.

So...

1. If I were to double up the floor joist by sistering would that decrease the deflection to where I can install tile?

2. Considering keeping the overall thickness down, could I do 3/4 subfloor, ditra then tile if the tile were porcelin or ceramic?

Appreciate any input.

I'll leave you with a picture that looks to be done by the builder of a mod to the floor joist to get the iron vent stack in place.

Picture #2 (bottom right)
Attached Images
  
__________________
mike
mohamie is offline   Reply With Quote
Sponsored Links
Unread 02-23-2012, 01:39 PM   #2
bbcamp
Registered User
 
Join Date: Jul 2002
Posts: 30,274
1) Yes. The un-hacked joists can be sistered with a 2x8 in the middle 2/3s of the span. The hacked ones need the sister and some sort of patch to make up for the lost material

2) Yes. If you have plank subfloor now, use 1/2" plywood over them and then Ditra. To keep the height any lower, you'd have to remove the planks.
bbcamp is offline   Reply With Quote
Unread 02-23-2012, 01:44 PM   #3
cx
Moderator emeritus
 
cx's Avatar
 
Join Date: Jul 2001
Location: Boerne, Texas
Posts: 88,619
Welcome, Mike.

1. What Injineer Bob said.

2. Think he's already removed alla plank and is fixin' to install 3/4" OSB on the joists, Bob, but maybe I'm disunderstanding what he said. I wouldn't be real happy with that as your only subflooring, but it meets the industry minimum standards.

My opinion; worth price charged.
__________________
CX

Y'ALL NEW VISITORS READ THIS HERE!
cx is offline   Reply With Quote
Unread 02-23-2012, 01:48 PM   #4
mohamie
Registered User
 
Join Date: Feb 2012
Posts: 4
Thanks for the reply bbcamp.

The original TG has been pulled, I'm to the bone at this point. I'm replacing the hacked up and swiss cheese joists. Heck according to this inspector site I have been reading the multiple electrical holes in most of the joist put them in the catagory of needing replaced or reinforced. And that is before I do my hacking!

Since I'm removing the original flooring I heard the 3/4 TG OSB is the way to go. I haven't looked into the options at this point though.
__________________
mike
mohamie is offline   Reply With Quote
Unread 02-23-2012, 01:54 PM   #5
mohamie
Registered User
 
Join Date: Feb 2012
Posts: 4
CX

I'm asking for your expert advice so please don't hold back. Ok that's minimum but I want a quality install. My concern is radical hieght difference between bathroom and hallway. But my knowledge is from a diy'er perspective.
__________________
mike
mohamie is offline   Reply With Quote
Unread 02-23-2012, 03:21 PM   #6
WendyHMN
Amateur Jack of All Trades
 
WendyHMN's Avatar
 
Join Date: May 2010
Location: Minnesota
Posts: 2,516
Don't worry overmuch about height, unless you are dealing with a hard-to-cut exterior door. I have some places in my house with 3/4" differences at the threshold and I only trip over them if I'm really drunk. You can make them pretty with various transitions. Concentrate on doing the tile right.

And don't just blame DIY for the hacking. I have some holes and notches in my house made by actual builders and plumbers that are far worse than anything I've done myself.
__________________
Wendy

Blue belt DIYer. Moderately proficient and occasionally useful.
See my finished master bath here.
WendyHMN is offline   Reply With Quote
Unread 02-23-2012, 04:12 PM   #7
bbcamp
Registered User
 
Join Date: Jul 2002
Posts: 30,274
Two layer subfloors are better in that there is never a single joint going all the way through to the joists. The subfloor doesn't "break" over the joist, but gradually bends. That is very important with stone floors, but lesser so with porcelain if you use any of the tile underlayments that specify/accept single layer subfloors. I wouldn't have any issues with a CBU underlayment over a single layer subfloor if it meets the manufacturer's requirements and is properly installed.
bbcamp is offline   Reply With Quote
Reply

Stonetooling.com   Tile-Assn.com   National Gypsum Permabase


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Deflect-o-lator and stone tile (travertine) Markisa Tile Forum/Advice Board 4 10-09-2011 02:44 PM
Deflect-O-Lator and Subfloor questions fourml8r Tile Forum/Advice Board 7 11-24-2009 10:33 AM
Deflect-O-Lator Electrician Al Tile Forum/Advice Board 10 01-09-2006 11:47 AM
Deflect-O-Lator Rating Help Craig1 Tile Forum/Advice Board 4 04-23-2005 07:46 AM
failed the deflect-o-lator bctile601 Professionals' Hangout 15 07-11-2003 04:13 PM


All times are GMT -6. The time now is 06:19 AM.


Sponsors

Powered by vBulletin® Version 3.7.4
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Copyright 2018 John Bridge & Associates, LLC