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MR® Faced Batts

R-11 / R-30
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. The facing serves as an integral vapor retarder and is additionally protected from the growth of mold and mildew. MR® Faced insulation is available in pre-cut batts that fit standard wall cavities. MR® Faced Batts are available in a variety of R-values up to R-30.

*** AVAILABILITY NOTICE — This product is not available in the Western Region of the United States. Please contact a JM representative for more information. ***

How to Install Batts

Installation Tips

1. For ceiling and attic spaces, use batts of R-30 or R-38. In exterior walls R-13 to R-21 is commonly used, while in interior walls where insulation is used for sound control, R-11 is used most frequently.
2. Open the packages by cutting lengthwise through the side panel. Be careful to avoid cutting the product or facing. The insulation will quickly expand to its full volume when the bag is opened.
3. Gently push batts into the cavity so that it sits all the way in, especially at the corner and edges. Then, fluff it to its full expansion by pulling it forward to fill the depth of the cavity. The fit should be snug,
4. With faced batts make sure the vapor retarder is facing the conditioned interior space, unless building codes specify otherwise.
5. Allow friction to hold the batts in place. Or you can staple the flanges of faced batts to the inside or face of the joists. (Stapling on the inside is preferred by many drywallers because it leaves the edges of the framing members easier to locate. However, your local building codes may require you to overlap the flanges and staple them to the edges of the framing members.)
6. Take care not to stretch the facing too tight as you staple, which can over compress the batt, and avoid gaps and puckers.
7. Secure floor insulation with wire fasteners, sometimes called "lightning rods." Press the fasteners so they bow up gently against the subflooring without compressing it. Space the fasteners at least six inches from each end of the batt and 12" - 24" apart.
8. Cut insulation about an inch wider than the space using a sharp utility knife against a safe backstop, such as an unfinished floor or other smooth, flat surface. Always cut on the unfaced side of the batt.
9. Johns Manville's EasyFit® batts have vertical perforations at intervals along the width of the batt so cutting with a knife is not needed. Simply grip the insulation on either side of the perforations and tear to trim it to the desired width.
10. For shorter spaces, cut the insulation to fit properly. Don't double it over or compress it. Compression changes the R-value of the insulation.
11. If it takes more than one batt to fill the height of a wall cavity, make sure the two pieces are butted snugly together.