Plastic Over Insulation In Garage

Insulating the area in the attic over a garage might keep the temperature a little more stable in the garage but it does little to reduce the amount of energy needed to heat and cool your house so it s not a good investment of your energy dollars.

Plastic over insulation in garage. Make sure you have enough ventilation on your roof as well. Press the poly firmly into. Attics walls and between crawlspace joists. Stops heat loss into your attic.

Danny lipford in an uninsulated attic over a garage. Best for long unobstructed spaces like over attic joists. If your garage is 45 degrees and you have a bonus room heated to 72 degrees above the garage the vapor retarder faces the upstairs room. Install the plastic sheeting only after the.

The best vapor barrier to use is roll of plastic sheeting. Purchase plastic in dimensions that limit the number of seams between plastic sheets. Glass fibers in puffy strips with or without a paper or aluminum face. Featuring fiberglass or polystyrene panels these kits will generally come with enough pre cut panels to cover a garage door with a width of 9 ft.

There should be a continuous ridge and soffit ventilation. The cool surface is the sheathing assuming no exterior insulation. Squirt a bead of acoustical caulk sealant designed for use with a poly vapor barrier along the bottom and top of the wall where the plastic meets the floor or ceiling. If you are insulating the garage ceiling not only by the truss level but also up by the roofline then you must leave at least 1 1 2 to two inches of air between the fiberglass and the underside.

Equipped with pretty much everything you need you can buy a garage insulation kit at a variety of retailers including home depot lowes or amazon. Wall insulation keeps out cold. Plastic on the outer surface of a wall in cold weather could cause problems. Six mil polyethylene plastic comes in rolls of various dimensions.

Your bonus room subfloor usually osb or plywood is a perfectly adequate vapor retarder so no polyethylene is needed even in the 1970s scenario before building science made us smarter. After the insulation is installed it is necessary to cover it up with a vapor barrier so the glass fibers are not inhaled. Must be measured and cut to fit walls or flat surfaces. Plastic on the outside.

Stops heat loss into your attic.