Go Back  DoItYourself.com Community Forums > Interior Flooring, Floor Coverings and Coatings Center > Wall and Flooring Indoor Tiling
Reload this Page >

? on installing plywood and backer board over existing subfloor planks

? on installing plywood and backer board over existing subfloor planks

Reply

  #1  
Old 01-05-14, 01:01 PM
Member
Thread Starter
Join Date: Jan 2014
Location: USA
Posts: 18
Received 0 Votes on 0 Posts
? on installing plywood and backer board over existing subfloor planks

New to this forum, but have been looking at the good suggestions for some time.

I am looking to install ceramic tile to existing 2nd floor bathroom. Removed existing floor down to 2 x 6, 3/4" planks. Secured loose or squeaky planks.

I am planning on installing 1/2" plywood on top of planks and 1/4" backer board for the 1/4" tiles. Everything I have been reading says to use thinset for the backerboard.

Toilet flange is 1-1/4" above plank subfloor so these measurements would seem to add up ok, I hope.

This is a small bathroom measuring 60" x 104"

Joists are 16" on center.

Am I ok on this plan?

Also, if you use thinset to install the backerboard and have the plywood screwed into planks.......how would you ever remove the floor in the future if the screws are covered with the thinset, or is something I should even be concerned with.

Thanks for the help/ advise in advance.

Murph
 
Sponsored Links
  #2  
Old 01-05-14, 01:12 PM
Banned. Rule And/Or Policy Violation
Join Date: Apr 2013
Location: USA
Posts: 4,297
Received 0 Votes on 0 Posts
I'd be very concerned with just 2 X 6's for floor joist.
How long a span are they?
 
  #3  
Old 01-05-14, 01:18 PM
XSleeper's Avatar
Group Moderator
Join Date: Dec 2004
Location: USA
Posts: 23,882
Received 301 Votes on 274 Posts
I think I'd suggest a minimum of 5/8" ply if the planks are fairly rough. And I would not worry about removing the screws someday. If you think it will be YOU, make sure all your screws are in nice straight lines and put a band of 1" wide masking tape over them. I would never do it but someone might thank you. In reality, I can't see anyone ever taking up the subfloor for any reason.
 
  #4  
Old 01-05-14, 01:19 PM
Member
Thread Starter
Join Date: Jan 2014
Location: USA
Posts: 18
Received 0 Votes on 0 Posts
no, the 2 x 6 planks are on top of double 2 x 4 joists
 
  #5  
Old 01-05-14, 01:26 PM
Member
Thread Starter
Join Date: Jan 2014
Location: USA
Posts: 18
Received 0 Votes on 0 Posts
attached is a pic of the subfloor
 
Attached Images  
  #6  
Old 01-05-14, 01:30 PM
chandler's Avatar
Banned. Rule And/Or Policy Violation
Join Date: Dec 2005
Location: USA
Posts: 39,967
Received 3 Votes on 3 Posts
Let's back up. You said they were 3/4" planks and they grew to 2x6. And your floor joists were 2x6 and shrunk to doubled 2x4's. May help us if you posted pictures of joists and subflooring.

Edit. That was fast. I don't think those are 2x6s on the angle. 2x4s are never used for subfloring, so we need clarification
 
  #7  
Old 01-05-14, 01:47 PM
Member
Thread Starter
Join Date: Jan 2014
Location: USA
Posts: 18
Received 0 Votes on 0 Posts
OK I must plead ignorance here, as I thought the joists were the structural boards that the planks sit on. the planks are 3/4" x 6", my bad there(not sure what I was thinking)

If I look between the 3/4" x 6's(or basically 1 x 6's)there are double 2 x 4, or maybe they are 2 x 6's as I am only going on what I can see between the plank slats. not sure if it easy to see the joists, looking between the plank gap, in the attached pic.
 
Attached Images  
  #8  
Old 01-05-14, 02:05 PM
Member
Thread Starter
Join Date: Jan 2014
Location: USA
Posts: 18
Received 0 Votes on 0 Posts
Does that make more sense?

The joists are not 2 x 4', but either 2 x 6 or 2 x 8's.
 
  #9  
Old 01-05-14, 02:50 PM
czizzi's Avatar
Member
Join Date: Jul 2007
Location: USA
Posts: 7,376
Received 9 Votes on 7 Posts
Stick a coat hanger down through one of the cracks until it either hits the ceiling of the floor below or you can "hook" the bottom of the joist and measure how thick it is. We already have one vote for 5/8" - I recommend 3/4" Advantech (or equivalent) then 1/4" cbu then tile which should add up to your 1 1/4". Take the time now to screw down all the 1/6 planks to prevent squeaks.

Don't worry about removing screws down the road, if done correctly, the floor should outlast both of us.
 
  #10  
Old 01-05-14, 04:16 PM
Member
Thread Starter
Join Date: Jan 2014
Location: USA
Posts: 18
Received 0 Votes on 0 Posts
Thanks everyone. Yep , measured and joists are at least 2 x 8, but maybe even 2 x 10.

I will take the advise here and go with 5/8" ply

Thanks again and sorry for adding to any confusion.
 
Reply

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


Thread Tools
Search this Thread
 
Ask a Question
Question Title:
Description:
Your question will be posted in: