ADDING INSULATION IN WALLS OF A 60-YEAR OLD STUCCO HOME?
QUESTION FROM JOHN, DIAMOND BAR, CA.:
I have a 60 year old 2 story home that has stucco. Should I have insulation added to the walls ? Will it be that much more energy efficient by doing so ? Any idea of the payback time if done ?
ANSWER FROM THE INSULATION DOCTOR:
Regarding wall insulation the normal payback for blown-in insulation in exterior walls is approximately 10 years compared to adding insulation to your exposed ceiling to for example an R-value of 49 with a payback of 3-1/2 years.
Regarding the stucco walls you need to be aware that blown-in insulation in exterior walls requires drilling holes every 16" on center in the outside walls. This would require you to have the stucco repaired and repainted. Most likely it will cost more than the insulation itself.
Hope this helps.
The Insulation Doctor