Dense packed walls and loose filled R60 ceilings make our buildings more efficient then the rest. The thermal performance of loose filled cellulose compares favourably to other types of low cost insulation, The thermal conductivity of loose-fill cellulose is approximately an R-value of 3.8 per inch compared to commonly used fibre glass batts an R-value of 2.9 per inch.
Cellulose is very good at fitting around items in walls like pipes and wiring, leaving little to no air pockets that can reduce the overall efficiency of the wall. Dense pack cellulose can seal walls from air infiltration while providing the density to limit convection, when installed properly. The University of Colorado School of Architecture and Planning did a study that compared two seemingly identical test structures, one insulated with cellulose and the other with fiberglass. The cellulose insulation lost 26.4% less heat energy over time compared to the fiberglass insulation. It also was shown to tighten the structure more than 30%. Subsequent real world surveys have cellulose performing 20-30% better at reducing energy used for heating than fibreglass.