Not every type of insulation needs a vapor barrier.
Plastic sheeting over insulation.
After the insulation is installed it is necessary to cover it up with a vapor barrier so the glass fibers are not inhaled.
The hdx 10 ft.
Plastic sheeting is a general purpose plastic film for use in a variety of construction and diy projects.
This is what building scientists proposed as the solution for walls that wouldn t hold paint back in the early days of insulation.
If the insulation is in your walls it is okay to put up plastic before you put up sheet rock.
Find plastic sheeting film at lowe s today.
Install the plastic sheeting only after the insulation wiring and plumbing have been completed.
It didn t solve the paint problem though because water vapor from the indoor air wasn t the main source of moisture.
The sheet of poly still cuts off drying to the indoors but it keeps the water vapor in the humid indoor air away from the cold surfaces inside the wall.
Center the material so the excess is approximately equal on either end as.
Plastic the hdx 10 ft.
Measure the length of the wall.
Unroll a length of 4 mil polyethylene commonly called either poly or simply plastic.
Purchase plastic in dimensions that limit the number of seams between plastic sheets.
The best vapor barrier to use is roll of plastic sheeting.
Commonly used as a vapor barrier in between insulation and drywall.
How to install poly over insulation 1.
If the insulation is in your basement ceiling again it is okay to put up plastic.
Vapor barriers sheets of plastic or kraft paper keep water vapor out of the wall cavity so the insulation stays dry.
Illustration by ian worpole insulation options.