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 04-10-2020, 02:29 PM   #1
CNM DESIGN
Registered User
 
Join Date: Feb 2010
Location: Southeast Ohio
Posts: 24
Tile + 1/2" OSB + 1/2 Foam Board + 1/2" Drywall Deflection

Hello Everyone, long time since my last project.

Tiling a room with porcelain and will be hanging a drywall ceiling underneath.

There will be 1/2" Pex Al Pex between the OSB and the Drywall surrounded by the foam board as a spacer.

Will this be OK or is it to close?

For joists that are Unknown wood, but in good condition, 9.25 inches tall, 2.5 inches wide, 16 inches on center, and 15 feet long between supports, the deflection calculated is 0.444 inches.
This translates to a deflection of L / 405.
Since the maximum deflection for tile is L / 360, and for natural stone is L / 720, your floor is rated for Ceramic tile, Congratulations!

2x10 floor joist will be sistered on both sides with 1/2" OSB.

Thanks
__________________
Craig

20yr retired combat vet, 17yr Master Weaver with the Longaberger Co. Owner of Final Salute LLC.. Veterans Memorial Shell Casing Displays.

www.afinalsalute.com

Last edited by CNM DESIGN; 04-10-2020 at 03:05 PM. Reason: spelling
CNM DESIGN is offline   Reply With Quote
Sponsored Links
Unread 04-10-2020, 04:22 PM   #2
jadnashua
Veteran DIYer- Schluterville Graduate

STAR Senior Contributor

 
Join Date: Jul 2004
Location: Nashua, NH
Posts: 14,203
The deflection calculator won't give you an accurate number if you sister 1/2" ODB to the sides of your joists. It won't be the same as a solid piece of lumber 2.5" thick. Typical OSB isn't designed to be installed that way.
__________________
Jim DeBruycker
Not a pro, multiple Schluter Workshops (Schluterville and 2013 and 2014 at Schluter Headquarters), Mapei Training 2014, Laticrete Workshop 2014, Custom Building Products Workshop 2015, and Longtime Forum Participant.
jadnashua is offline   Reply With Quote
Unread 04-10-2020, 08:38 PM   #3
cx
Moderator emeritus
 
cx's Avatar
 
Join Date: Jul 2001
Location: Boerne, Texas
Posts: 91,866
Welcome back, Craig.
Quote:
Originally Posted by Craig
There will be 1/2" Pex Al Pex between the OSB and the Drywall surrounded by the foam board as a spacer.
'Fraid you've lost me completely there. Maybe more hints?

What Jim said. I have no idea what you might actually achieve using that method, but I'm reasonably sure it won't do you much good at all, 'specially considering that none of your pieces of OSB would be longer than 8 feet. Don't think it would be worth any of the effort.

My opinion; worth price charged.
__________________
CX

Y'ALL NEW VISITORS READ THIS HERE!
cx is online now   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
Heated Garage floor with 3" pink foam board, What is easiest subfloor plywood +hardi? rollandelliott Tile Forum/Advice Board 29 06-27-2014 06:38 AM
Transition from 1/2" Hardi to 1/2" drywall and the 1/16" difference?? Stainless169 Tile Forum/Advice Board 18 02-10-2014 08:32 PM
12x24 porcelain over 1/2" drywall "greenboard" Vojtech Tile Forum/Advice Board 3 06-21-2012 12:43 PM
1/4" cement board meets 1/2" drywall gorgiasred Tile Forum/Advice Board 29 02-06-2010 02:41 PM
Quick question "mud" with tile vs. drywall jthoni Tile Forum/Advice Board 1 06-07-2005 02:32 PM


All times are GMT -6. The time now is 09:31 AM.


Sponsors

Powered by vBulletin® Version 3.7.4
Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.
Copyright 2018 John Bridge & Associates, LLC