Johns Manville R31 Unfaced Fibreglass Batt Insulation

R-31 JM insulation is a high-performance fiberglass batt insulation produced by Johns Manville. It is designed to provide excellent thermal resistance, making it ideal for insulating attics, ceilings, and floor cavities in residential and light commercial buildings.

What R-31 Means

The R-value measures how well insulation resists heat transfer.

• R-31 offers strong thermal performance for attic and ceiling insulation.

• Higher R-values help reduce heat loss in winter and heat gain in summer.

• Proper insulation helps improve energy efficiency and indoor comfort.

Material and Construction

R-31 insulation is made from fiberglass fibers that trap air and slow heat movement. The insulation comes in pre-cut batts, allowing quick installation between joists or framing members.

Key features include:

• Lightweight and flexible

• Non-combustible fiberglass

• Moisture and mold resistant

• Excellent sound absorption

• Long-lasting and durable

Common Applications

R-31 JM insulation is commonly used in:

• Attic floors

• Ceilings

• Floor cavities between levels

• Residential homes

• Light commercial construction