Do I Need A Vapor Barrier Under Carpet

A vapor retarder is a material used to prevent water vapor from diffusing into the wall ceiling or floor during the cold winter. After the insulation is in place you will want to add a vapor retarder sometimes called a vapor barrier if you need one. Whether or not you need a vapor retarder hinges on three main factors.

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See what goes into waterproofing a basement too.

Do i need a vapor barrier under carpet.

The felt paper is a good option for hardwood but since you re nailing the hardwood down you do not need a foam underlayment. Any of our vapor barrier types of products can be used in this application over the concrete slab. It will not only help you keep your carpet clean and dry but it will also protect the wood or cement underneath the carpet from becoming damaged. Any kind of persistent moisture will allow mold to get a foothold and soon ruin carpet or wood flooring.

You only need to worry about the moisture barrier when it comes to a concrete subfloor so you do not need one in this case. Installing a moisture barrier underneath your carpet is a always a good idea. If you use one it is no harm but you don t really need it. Before one can make the best decision regarding whether or not to place a vapor barrier under a concrete floor slab on grade it is important to understand the sources of moisture how it moves through the slab and how it adversely affects certain floor coverings adhesives and coatings.

The crawl space has a scratch coat of cement on the floor. For a dry mold free finished basement floor always install a vapor barrier before laying a wood subfloor or carpet pad. For below grade slabs assume that the concrete floor will get damp. Do you know if there are any contra indications to putting the vapor barrier on top of the concrete to separate it from the carpet pad.

But what was done was that a vapor barrier was stapled to the bottom of the subfloor apparently prior to putting down the subfloor since. Not every wall does. It seems your products are used mostly between the ground and the concrete slab.

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