I live in central Florida and I have a concrete block home built in 1983. I am debating whether or not to have the spray in foam insulation placed in the walls. I have heard that this can save up to 25% on your energy bill.
I’ve been doing some research on the subject and it seems to me that the spray in foam insulation would not be that effective if it only filled the void within the concrete blocks. I have read that if the insulation only fills the void within the concrete block, it will only increase the R value of the wall by 2 (because heat can still be transferred through the edges of the concrete block, where there is no insulation). I was wondering if anyone had specific data on the subject – what is the R value of a concrete block wall with no insulation and how much does adding insulation to fill the void increase the R value of the wall?
From what I have said previously, it doesn’t seem like the R value of the wall increases significantly. I was wondering if there is any significant energy savings obtained by sealing any air leaks that may exist in the walls?
Getting the insulation installed will cost around $1000 and I want to make sure that it will be worth the money.