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Insulation Without Interruption: A Parka For Your Palace


 Continued From Page 27


expected to save more money than its initial cost over the material’s service life. If the SIR value is below 1.0, it means you would need to replace the parts before 


We modeled three (3) scenarios for each building:  The existing buildings with no improvement


 Adding two inches of Extruded Polystyrene (XPS) continuous insulation (R10) to the exterior (XPS is the densest and most commonly used material for 


 Adding three inches of XPS continuous 


Current Seattle City Light energy rates were used.


What we found from the models was that the payback period for adding continuous insulation to both buildings is generally long, around 30 to 40 years. Payback is faster for the 4-plex rowhouse condominium because there is a greater proportion of insulated wall area compared to the 8-unit building. Three inches of


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28 Community Associations Journal | November/December 2019


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