How to Insulate a Bedroom

Written by steve sloane
  • Share
  • Tweet
  • Share
  • Pin
  • Email
How to Insulate a Bedroom
Insulating bedrooms keep down heating and cooling bills (construction worker, image by Greg Pickens from

Bedroom insulation requires caulking the windows and caulking where the stud walls meet the floor. The walls, ceiling and floors will also need rolled fibreglass insulation. If you have an old house that has no insulation in the walls, you may hire a contractor who can "blow" loose insulation from the attic down into the wall cavity. However, you can also remove drywall to install rolled insulation. If building a new house, you must install the insulation after framing and installing the plumbing and electrical wiring.

Skill level:
Moderately Easy

Other People Are Reading

Things you need

  • Caulk and caulk gun
  • Foam sealant
  • Insulation
  • Workman's knife
  • Tape measure
  • 1/2-inch staples
  • Staple gun
  • Dust mask
  • Rubber gloves
  • Long-sleeved shirt

Show MoreHide


  1. 1

    Cut off the tip of the caulk tube stem at a 45-degree angle before placing it in a caulk gun. Hold the tip of the stem at the point where the outside wall frame meets the bedroom window frame, pushing gently on the trigger, and moving the tip around the entire frame of the window to release a line of caulk. Smooth out the caulk with a wet finger. In like fashion, place the tip of the caulk stem at the point where the bottom of the stud wall meets the floor. Push the trigger while moving the stem along the floor/stud wall join on all four walls (don't forget closets). Again, use a wet finger to flatten out the caulk.

  2. 2

    Squirt foam sealant into any holes in the stud wall frame such as those caused by drills. Then unroll one length of insulation. Place it between the two vertical wall studs starting at the top, and push it into place (the vapour retarder should be on the outside, facing you). The vapour retarder has a lip that you can use to staple the insulation to the side of the wall stud. Use 1/2-inch staples every 10 inches, installing them with a staple gun. If you have 8-foot walls, one piece of insulation should reach from floor to ceiling. Continue in like fashion until all the bedroom walls are insulated. Both the floor and ceiling also need to be insulated, following the same steps.

  3. 3

    Cut the insulation when necessary by placing the insulation on the floor with the retarder facing down. Place a metal ruler over the insulation and run a workman's knife against the ruler. Do this a few times before the insulation is cut through. Always cut out areas in the insulation for electrical boxes and plumbing, before installing the insulation.

Tips and warnings

  • Rolls of insulation have different "R" values. The higher the "R" value, the better the insulation. Depending on which part of the country you live, local permit laws require different "R" value levels; check with you local permit office before installing any insulation. Ceilings and floors also require a different "R" value to walls: check with the local permit office for requirements.
  • Insulation comes in 16-inch or 24-inch widths. Measure the distance between your wall studs/floor joists before purchasing insulation.
  • Insulation is made of fibreglass, with vapour retarder (paper) on one side. Wear rubber gloves, a dust mask and long-sleeved shirt when installing insulation.

Don't Miss

  • All types
  • Articles
  • Slideshows
  • Videos
  • Most relevant
  • Most popular
  • Most recent

No articles available

No slideshows available

No videos available

By using the site, you consent to the use of cookies. For more information, please see our Cookie policy.