Vapor barrier?


  #1  
Old 05-28-07, 12:03 PM
L
Member
Thread Starter
Join Date: Jan 2006
Location: Huntington Beach
Posts: 439
Upvotes: 0
Received 0 Upvotes on 0 Posts
Vapor barrier?

Is a vapor barrier the same as underlinement?
 
  #2  
Old 05-28-07, 12:21 PM
HotxxxxxxxOKC's Avatar
Banned. Rule And/Or Policy Violation
Join Date: Jul 2006
Location: USA
Posts: 7,754
Upvotes: 0
Received 1 Upvote on 1 Post
No. Underlayment can be considered your subfloor, i.e. plywood, OSB, thinset, etc.

Vapor barrier is plastic sheathing attached to the subfloor.
 
  #3  
Old 05-28-07, 11:12 PM
L
Member
Thread Starter
Join Date: Jan 2006
Location: Huntington Beach
Posts: 439
Upvotes: 0
Received 0 Upvotes on 0 Posts
OK that makes sense. When I had my laminate installed they used a vapor barrier that came in a rioll. Now I want to add more (different manufacturer) and the vapor barrier is attatched to the bottom of the laminate.
 
  #4  
Old 05-30-07, 09:18 PM
Join Date: Nov 2000
Location: Austin, TX
Posts: 4,857
Upvotes: 0
Received 0 Upvotes on 0 Posts
No, that is not the moisture barrier. It is the underlayment cushion. A vapor barrier is sealed plastic, with a good perm rating.


If your going over a wood substrate, you will not need an additional moisture barrier. Over concrete, you will need to buy some 6 or 8-mil plastic
 
  #5  
Old 05-30-07, 11:05 PM
L
Member
Thread Starter
Join Date: Jan 2006
Location: Huntington Beach
Posts: 439
Upvotes: 0
Received 0 Upvotes on 0 Posts
I am going over concrete, so even with the underlayment that comes with Dupont laminate flooring I will need to lay a vapor barrier?
 
  #6  
Old 05-31-07, 12:00 AM
T
Member
Join Date: Aug 2000
Location: USA
Posts: 15,047
Upvotes: 0
Received 2 Upvotes on 2 Posts
Dupont says, "If installing over concrete or a concrete floor covered by tiles, you must first lay down a 6-mil plastic sheet vapor barrier."

If in doubt, contact Dupont at 1-877-43-TOUCH or 1-877-438-6824 or flooring@mail1.dupont.com.
 
  #7  
Old 05-31-07, 08:15 AM
HotxxxxxxxOKC's Avatar
Banned. Rule And/Or Policy Violation
Join Date: Jul 2006
Location: USA
Posts: 7,754
Upvotes: 0
Received 1 Upvote on 1 Post
That underlayment on the back of the laminate is not vapor barrier. It's just a cushion.

Do as the others suggested and lay down at least 6-8mil plastic vapor barrier.

Tape all seams and have it go up the walls 2". (the baseboards will cover it)
 
 

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