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Insulating Ceilings

Ceiling insulation provides essential sound control between floors in your home. Properly insulating the ceilings will make your home a more peaceful and quiet place because it will ensure that footsteps and other sounds do not migrate to other rooms.

When ceiling insulation is installed at the same time as wall insulation, which is usually the case in new construction, it is installed up from underneath, before drywall is put in.

Follow the installation tips below to ensure that you do a professional job. It's a good idea to wear a work helmet when you're installing ceiling insulation. This can help you avoid injuring yourself on exposed framing members such as ceiling joists, exposed nails and other hazards. Refer to our complete list of Safety Tips for more important ways to protect yourself while installing insulation.

Make sure you are using insulation with the most appropriate R-value. Our R-value Estimator in the Site Toolbox can guide you. Click on the product links below to learn more about the JM insulation products you can use in ceilings.

How to Install Insulation In Ceilings

  1. Seal around all penetrations in band joists. Any walls that leak water must be repaired before insulating.
  2. Caulk where wiring runs through the ceiling joists and around the top of the wall.
  3. Gently press the insulation between the joists. If you're using unfaced batts or rolls, allow friction to hold the insulation in place (called "friction fit method"). If a polyethylene vapor retarder is used, staple it across the unfaced batts. Check to make sure there are no openings where moisture can escape. If you're using faced insulation, install it with the vapor retarder positioned down toward the room. Hold the insulation up with one hand, while stapling the flange on both sides every 6" - 8" with the other hand. Leave a little extra on each end to cover the top plate of the outside wall.
    In attic installations, make sure the insulation completely covers the top plate of the outside wall at the end of each joist run. However, it should not block the flow of air from the eave vents. If necessary, install baffles at the inside of eaves.
  4. Expand the insulation to its full thickness in the joist cavity to insure complete coverage. Avoid compressing the insulation material, because compression will reduce its R-value.

Related Products

JM Spider® Custom Insulation System

JM Spider® custom insulation sprays-in filling all gaps and voids in your walls, significantly improving energy efficiency, sound control and family comfort.

ComfortTherm® Batts and Rolls

ComfortTherm® insulation is a lightweight, thermal and acoustical insulation made of long, resilient glass fibers bonded with an acrylic thermosetting Formaldehyde-free™ binder.

Kraft-Faced Batts and Rolls

JM's Kraft-Faced Batts & Rolls are made of naturally white, Formaldehyde-free™ fiber glass, reducing environmental concerns including the risks of poor indoor air quality and the effects of manufacturing on the environment.

Unfaced Batts and Rolls

JM's Unfaced Insulation is a lightweight thermal and acoustical fiber glass insulation made of long, resilient glass fibers bonded with an acrylic thermosetting resin made without formaldehyde.

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