Rental houses weatherized

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.