Do I need a vapor barrier on the second floor?

You should not need a vapor barrier for wood floors on the second floor. Unless there is some water feature, steam room, or other moisture sources on the first floor, the moisture barrier for hardwood floors under the first floor should suffice for the rest of the home.

Should you put a vapor barrier between subfloor and underlayment?

It is rolled out between the actual laminate flooring planks and the subfloor. Very often, particularly in a below-grade installation on a concrete basement floor, a vapor barrier is recommended in addition to the underlayment. That vapor barrier would go between the subfloor and the underlayment.

Do you need vapor barrier on plywood subfloor?

If there is no barrier, once the plywood subfloor starts to develop moisture, the moisture can create mold, which can destroy your flooring. If you have carpet, it can cause mold and mildew to grow through it.

Can I put vapor barrier under subfloor?

Vapor Barrier When You Have Plywood Subfloors If you want to be extra careful with moisture issues, you can install a vapor barrier before you install your subfloors, mainly if the subfloors are right above the ground.

Should vapor barrier cover entire crawl space?

Creating a waterproofing system in the crawl space area may best start with enclosing the area to prevent additional water entering from the outside. If the crawl space is completely enclosed, supplying air from the HVAC system can help to quickly evaporate any additional water that may enter the space.

What should I put down on my crawl space floor?

If you would like to keep your crawl space vented because you live in a low humidity environment we recommend insulating the crawl space floor with fiberglass or rock-wool mixed with spray foam for air sealing.

Can you use plastic sheeting as a vapor barrier?

In simple terms, a vapor barrier is a material that won’t allow moisture to pass through it, such as plastic sheeting. A very simple experiment to show how a vapor barrier works is to lay a plastic garbage bag down on some damp soil.

Do I need a moisture barrier on wood subfloor?

Wood Subfloors Sometimes, a moisture barrier is not recommended. If you’re installing your hardwood floors over a wood subfloor, you should avoid using a moisture barrier. Over time, moisture can get trapped between the moisture barrier protecting your hardwood flooring and the wood subfloor.

Where do you put vapor barrier in walls?

Do not install a vapor barrier over an existing plastic sheeting,this will promote condensation

Do you need a vapor barrier when installing laminate flooring?

When a laminate floor is installed over a concrete subfloor a moisture barrier must be used. Most every laminate manufacturer will require a vapor barrier under laminate flooring. Also, do I need underlayment for laminate flooring on plywood?

Do I need a vapor barrier?

Most authorities recommend vapor barriers in certain situations: In areas with high humidity—such as greenhouses, rooms with spas or swimming pools, and bathrooms—vapor barriers are often recommended. Consult building inspection offices for local recommendations.

Do I need a vapor barrier under concrete slab?

Most exterior slabs do not need a vapor barrier. In general, place the concrete slab directly on top of the vapor barrier, with the subbase below. The vapor barrier can be placed under the subbase, if the building is closed in when the dry subbase material is placed.

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