How to Install Plastic Between Drywall & Insulation

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Plastic sheets between insulation and drywall creates a solid moisture barrier. Installing plastic is not recommended for every room or ceiling but works very well to protect humid rooms from releasing moisture into the walls. The plastic sheeting will force moisture up and through the ceiling so should only be installed where ceiling ventilation is available. The key to installing the plastic is to overlap seams to create a solid barrier while not interfering with the installation of the drywall.

Things You'll Need

  • 6-mil plastic sheets
  • Utility knife
  • Staple gun
  • Staples
  • Stretch the plastic sheeting out so that the sheets runs alongside the wall. Cut the sheeting with a utility knife to a few inches longer than the length of the wall.

  • Press the corners of the sheeting into the upper right and upper left corners of the wall. Staple the sheeting to the wall in the corners. The upper edge of the plastic needs to be tight, which will leave a little excess on the end.

  • Pull the lower corners so that the sheet is tight against the wall. Staple the lower corners to hold the sheet steady. Staple the sheet along the ceiling at each stud and along the base of the plastic at each stud.

  • Repeat the process to install a second row beneath the first. Overlap the second row onto the first by approximately 6 inches. Install a third row as necessary.

  • Cut excess off of the end if the plastic is only going up on one wall. Staple the end of the plastic to the first stud along the adjacent wall if you will be wrapping the plastic around the whole room.

Tips & Warnings

  • Drywall will be installed directly over the plastic. When wrapping the plastic around an inside corner, leave a little slack in the plastic to avoid tearing the sheeting when installing drywall corners.

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References

  • Photo Credit Jupiterimages/Photos.com/Getty Images
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