Six rental properties have been weatherized this winter under the Mass Save program. Cellulose insulation is densely packed into empty wall cavities and under attic floor boards. Loose-fill cellulose is added to attics to achieve an insulation value of R-60. The cellulose is manufactured locally (National Fiber in Belchertown) from recycled newsprint, and is treated with non-toxic borate for pest resistance. Two-part spray foam is applied around the basement perimeter, so the buildings are sealed and insulated high and low. Annual energy savings are estimated from $1100 to $2400 per building.
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