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PrintGarage Insulation - Insulating Knee Walls
Knee walls are side walls that back up to an unconditioned space such as an attic or garage. These walls should be insulated in the same way as any exterior wall using Kraft-faced insulation or unfaced insulation with a separate vapor retarder.
The best choices for this application include ComfortTherm®, MR® Faced, Kraft-Faced, or Unfaced with a separate vapor retarder film placed over the insulation.
JM insulation is manufactured in standard widths designed to fit the most common wall cavities. However, occasionally you may encounter nonstandard-width cavities. In these situations, you will probably find our EasyFit® batts to be the best solution.
EasyFit® insulation features vertical perforations that allow you to easily tear the insulation by hand. The perforation pattern accommodates most non-standard-width cavity. Or if you use JM ComfortTherm®, Kraft-Faced and Unfaced batts, you can cut them by hand with a utility knife using a 2x4 as a straight edge.
Special Considerations
Don't Forget
How to Install Garage Insulation in Knee Walls
Installation Tips
- If you are using faced batts, place the batts into the wall cavity and staple the flanges of the batts to the inside or face of the studs about every 12". If you are using unfaced batts, place the insulation into the cavity, making sure that it is the correct size and fits snugly at the sides and ends and does not protrude in the back.
- If the insulation is too long, cut it to fit properly. Don't double it over or compress it. Use a sharp utility knife and straightedge. Cut batts on a smooth, flat surface, and cut them about 1" larger than the framing cavity.
If the material is too short, cut a piece to size to fill the gap. - Fill in any narrow gaps between joists by forcing pieces of unfaced insulation into the gaps with a screwdriver or putty knife.
- To control air leakage, apply caulk or foam sealants around openings like window and door frames and any openings where wires or pipes go through the exterior wall.
Related Products
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.
MR® Faced Batts
MR® Faced Batts are a lightweight thermal and acoustical fiber glass 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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