leveling compound?

Reply

  #1  
Old 04-09-15, 02:00 PM
F
Member
Thread Starter
Join Date: Mar 2015
Posts: 45
Received 0 Votes on 0 Posts
leveling compound?

Osb floor with uneven spots from swelling.Want to put new laminate down.Is the best way to fix this to use leveling compound? If so,what kind do i use,and how is this applied? Thanks!
 
Sponsored Links
  #2  
Old 04-09-15, 02:21 PM
K
Member
Join Date: Apr 2014
Location: Nova Scotia
Posts: 750
Received 0 Votes on 0 Posts
How bad is the swelling ?
 
  #3  
Old 04-09-15, 02:22 PM
J
Member
Join Date: Jan 2011
Location: USA
Posts: 4,653
Received 53 Votes on 48 Posts
First need to find out what caused the swelling.
Is there a vapor barrier on the ground if there's a crawl space.
Any moisture will distroy a laminate floor.
 
  #4  
Old 04-09-15, 02:28 PM
F
Member
Thread Starter
Join Date: Mar 2015
Posts: 45
Received 0 Votes on 0 Posts
Not alot of swelling.Just some of the edges.Due to rain during building.
 
  #5  
Old 04-09-15, 02:35 PM
K
Member
Join Date: Apr 2014
Location: Nova Scotia
Posts: 750
Received 0 Votes on 0 Posts
I would use a scrapper or sander to cut down the high spots If it is only a few bad areas.
 
  #6  
Old 04-12-15, 12:31 PM
F
Member
Thread Starter
Join Date: Mar 2015
Posts: 45
Received 0 Votes on 0 Posts
Will try to sand down areas that are swelled.Was going to put 1/4" plywood on top of the osb.How should this be anchored.Was told by others to use flooring adhesive.Should it also be screwed down?
 
  #7  
Old 04-12-15, 01:16 PM
K
Member
Join Date: Apr 2014
Location: Nova Scotia
Posts: 750
Received 0 Votes on 0 Posts
The 1/4" ply is a waste of time and money if you are putting laminate down. If you don't get rid of the high spots thin plywood will just follow the contour anyway. You don't need a smooth surface to install laminate, it just needs to flat. How flat depends on the quality of the flooring and the foam underlay.

A belt sander with 60 grit paper or a flooring/ice s taper should get the bad spots down with little to no work.
 
  #8  
Old 04-12-15, 03:07 PM
F
Member
Thread Starter
Join Date: Mar 2015
Posts: 45
Received 0 Votes on 0 Posts
We only have a couple seams that are swelled a little.Would like a nice clean smooth finish and to stiffen it up a little.That is why we want to put down the plywood.Don't know if we have enough space for 1/2" plywood because of our dishwasher and fridge.
 
  #9  
Old 04-12-15, 03:20 PM
K
Member
Join Date: Apr 2014
Location: Nova Scotia
Posts: 750
Received 0 Votes on 0 Posts
1/4" will do nothing to add to the stiffness. Generally the only time a 1/4" underlay is used is when you need a nice smooth finish to put your flooring on where there is a chance that the texture of the subfloor could transfer to the finish floor, like if you were putting down vinyl sheet flooring. To install it, you would use 1 1/4" ring nails, not screws, spaced 6" over the entire sheet.

Unless the seams are swelled up more than 1/8", you should be fine to install laminate right over the subfloor. The foam underlay for the floor is what will even out the rough surface and make for a smooth transition for the laminate flooring.
 
  #10  
Old 04-12-15, 03:59 PM
F
Member
Thread Starter
Join Date: Mar 2015
Posts: 45
Received 0 Votes on 0 Posts
Don't believe it is more than 1/8th,but I just feel better putting another layer of plywood on it.You say 1/4" plywood would not help for stiffening it up,but what about 1/2"? Depending on thickness of flooring I get I might be able to go with 1/2" plywood.
 
  #11  
Old 04-12-15, 04:25 PM
K
Member
Join Date: Apr 2014
Location: Nova Scotia
Posts: 750
Received 0 Votes on 0 Posts
1/2" will help stiffen the floor. If you put down 1/2" you will need to screw it with minimum 1 1/2" deck screws. Every 8" on center. But again, unless you have less than 3/4" osb there now, I see no need for the extra layer if you are only installing laminate.
 
  #12  
Old 04-12-15, 04:43 PM
F
Member
Thread Starter
Join Date: Mar 2015
Posts: 45
Received 0 Votes on 0 Posts
All that is down is 3/4" osb that got wet during building.After a few years all the nails came loose and our floors were horribly squeaky.We had to lift all flooring and pull all loose nails in approx.900 square feet of flooring.We wanted to just replace osb but because of radiant floor heating tubes it would be a nightmare! We just re anchored the floor with deck screws and want to do everything possible so it wont squeak anymore.This is why we think maybe another layer would help.
 
  #13  
Old 04-12-15, 05:22 PM
K
Member
Join Date: Apr 2014
Location: Nova Scotia
Posts: 750
Received 0 Votes on 0 Posts
A second layer will not prevent squeaks. Squeaks come from movement of the subfloor on loose nails. Good building practice ( and code in some areas ) says the sheets must be glued to the joists as well when they are installed. This step will prevent most sqeaks even if the nails are a bit loose.

It is not uncommon for osb to get wet and swell a bit during construction. Manufacturers usually rate it for 90 days exposure before there are any issues with the integrity.

I would just make double sure you have screwed all the osb down, 8" on center with 2 1/2" deck screws, and have pulled out any loose nails. once that is done you should know right away if you have solved the issue. It sounds like you have already taken care of this and it has been done for a while. If you still have no squeaks, you should be safe.
 
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: