Plastic Over Insulation In Floor Joists

Sellers told clients that is was code at time the home was built i also heard that the builder argued with city building inspector about installing the vapor barrier over floor structure.

Plastic over insulation in floor joists. To enclose the space in a thermal envelope. Unfaced batt insulation friction fit between studs in walls with poly vapor barrier over walls and ceilings blown in attics with minimum r 40 insulation attention to detail. Of course you can follow the procedure you want to. A 6 mil polyethylene vapor barrier is placed over any ground floor.

There are two types of crawl spaces ventilated and unventilated and each requires its own form of insulation. Installing roll insulation in ceiling of basement which is under floors of living space my basement is heated but a smaller amount than up in living space usually 66 68 upstairs and 58 60 at the same time in basement my question is about the kraft paper facing i think it should face the basement because of any moisture in basement. If properly done this should not cause a condensation problem in the wall cavity unless you are leaking interior air thru gaps etc. If vents are not present in your crawl space insulate the walls instead of the joist bays.

Fiberglass insulation batts or rolls are the most economical and easiest diy choice for insulating between the floor joist in a crawl space. I inspected a home a while back and called out plastic vapor barrier that was installed over floor joists floors were insulated no vapor barrier on ground. Trim pieces of fiberglass insulation using a utility knife so the pieces fit into joist bays along the rim joist. The floor joists are all fastened to the rim joist which runs along the.

Cover the walls with insulation from the sill plate to the plastic covered dirt floor. Without insulation heat and cool air are easily lost through the floor. On 2018 08 31 by mod many cuts and staples in poly risk a rather leaky moisture barrier. After insulating between the floor joists with the vapor barrier up i want to cover the bottom of the floor joists with house wrap.

Department of energy recommends r 11 3 insulation under floors in warm climates and an r 25 6 to 8 in cold climates. The sill plate is the first piece of framing lumber and it runs on top of the crawl space wall. The ground floor could be river rock pea gravel dirt floor sand etc. The seams are typically overlapped 6 12 and almost never taped.

Always install batt insulation between the joists with the paper facing up against the underside of the subfloor then hold the insulation in place with lath wire or other means. Insulation also helps to preserve the air quality and reduce energy costs.