Sub Floor Insulation Vapor Barrier

Mike in victoria writes i m putting a new subfloor on a pier and beam foundation do i need a vapor barrier between the floor joist and the plywood.

Sub floor insulation vapor barrier. However if you are installing vinyl flooring over a concrete sub floor you will need a very thin vapor barrior such as visqueen vapor barrier underlayment to protect your flooring from. Your mobile home has insulation under the flooring and that insulation helps keep the outside air out of your mobile home. It is important to secure insulation and cover it with a vapor barrier in order to prevent moisture and the mold that often follows close behind. If i m understanding you the vapor barrier is just beneath the subfloor but on top of the joists.

Vapor barriers are sheets of plastic or other material placed on one side of insulation sheets. After the insulation is in place you will want to add a vapor retarder sometimes called a vapor barrier if you need one. The house was built back in 1926. In most parts of the country the vapor barrier should face upward.

This barrier is meant to keep moisture from getting to the insulation in the walls and ceilings and it is required by building codes when insulating most houses. 5 the orientation of the vapor barrier depends on the home s location and climate. Although research is needed there are several possible approaches to reduce condensation on the subflooring. In any case the vapor barrier must point to the warm side.

Insulation can actually make the problem worse by keeping the subfloor cool. Use insulation hangers wire staves spaced every 12 to 18 inches to hold the floor insulation in place without compressing it more than 1 inch. In a cold climate it s fine where it is. If the crawl space is ventilated which is ideal because it aids in the elimination of moisture then fiberglass insulation can be easily installed under the subfloor between the floor joists.

Moisture tends to condense on subfloors that are cooled by air conditioning in summer. A vapor retarder is a material used to prevent water vapor from diffusing into the wall ceiling or floor during the cold winter. With the vapor barrier between the insulation and. Glue down click lock or loose lay.

If you notice insulation hanging down from under your mobile home then your vapor barrier is torn. Not every wall does. Make sure rain drains away from the house on all sides. We have the skills to replace the old insulation with.