Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Flooring

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 12-07-2012, 08:15 PM   #1
Newbie
 
Join Date: Dec 2012
Posts: 4
Share |
Default

Retiling over 20 year Plywood


I'm retiling the kitchen after a crawlspace water leak which led to professional moisture, mold, and tile removal. I have 3/4" plywood over 2x10 16 o.c. joist. The previous layers consisted of subfloor, 1/4" lauan, lino,1/4 cement board and tile which trapped in moisture and mold. Cleaned up subfloor and covered with Fosters 40-20. Floor is solid except for some sag between joist in a couple of places that dip no more than 1/8 ". My question is, I plan on installing 1/4" Lauan over the plywood subfloor and then the cement backer board. Should I use thin-set to fill in the void between plywoods or just screw it down tight on the subfloor and then fill in the voids between backer board and lauan with thin-set? Thanks for any help.

wisemd03 is offline   Reply With Quote
Old 12-07-2012, 08:26 PM   #2
Member
 
Join Date: Mar 2011
Location: Ohio
Posts: 1,646
Default

Retiling over 20 year Plywood


luan has no place under tile. the minimum you should put down would be 3/8 plywood screwed to the subfloor but not the floor joists. can you add blocking between the joists in the places where the plywood sags between the floor joists? the 1/4 inch cement board is laid in a layer of thinset to fill the voids under it to make sure it is supported. it can be screwed or nailed. the cement board adds no structural strength to the floor, it only makes a suitable surface to adhere the tile to. also consider ditra instead of cement board for under the tile.

DannyT is offline   Reply With Quote
Old 12-07-2012, 08:27 PM   #3
Member
 
Join Date: Mar 2011
Location: Ohio
Posts: 1,646
Default

Retiling over 20 year Plywood


[quote=wisemd03;1068637]I'm retiling the kitchen after a crawlspace water leak which led to professional moisture, mold, and tile removal. I have 3/4" plywood over 2x10 16 o.c. joist. The previous layers consisted of subfloor, 1/4" lauan, lino,1/4 cement board and tile which trapped in moisture and mold. Cleaned up subfloor and covered with Fosters 40-20. Floor is solid except for some sag between joist in a couple of places that dip no more than 1/8 ". My question is, I plan on installing 1/4" Lauan over the plywood subfloor and then the cement backer board. Should I use thin-set to fill in the void between plywoods or just screw it down tight on the subfloor and then fill in the voids between backer board and lauan with thin-set? Thanks for any help.



if you use cement board the floor is leveled after the cement board is laid, with ditra the floor is leveled before it is laid.

Last edited by oh'mike; 12-08-2012 at 04:59 AM. Reason: added a space
DannyT is offline   Reply With Quote
The Following User Says Thank You to DannyT For This Useful Post:
wisemd03 (12-07-2012)
Old 12-09-2012, 01:41 AM   #4
Member
 
Join Date: Mar 2012
Location: Lynnwood, WA
Posts: 725
Default

Retiling over 20 year Plywood


Quote:
Originally Posted by DannyT View Post

if you use cement board the floor is leveled after the cement board is laid, with ditra the floor is leveled before it is laid.

Do you mind to elaborate? Are you saying the thinset under the cement board will leave the floor level, or are you saying that Self-leveler can go down over the cement board?
Seattle2k is offline   Reply With Quote
Old 12-09-2012, 07:26 AM   #5
DIY staff
 
Join Date: Sep 2009
Location: Kane county,Illinois
Posts: 21,273
Default

Retiling over 20 year Plywood


If you use cement board for a backer----set the board into a bed of thinset (like a giant tile) and screw or nail the rock---if leveling or flattening is needed---this is done after the board is set and nailed--
__________________
New members: Adding your location to your profile helps in many ways.--M--
oh'mike is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Plywood underlayment for 2nd flr of home? staplesking Flooring 4 08-21-2012 12:43 PM
OSB + Plywood = solid base for tiling? Denisrus Flooring 35 05-18-2012 11:13 PM
Can I use Thin Set Mortar over Interior Grade Plywood? JFERTICH Flooring 1 02-19-2011 05:08 PM
peeling year after year handifoot Painting 5 03-25-2010 06:45 PM
plywood damaged by water hendjl Building & Construction 4 11-03-2009 06:47 AM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.