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camato6600 12-05-2011 04:49 PM

Help with attic insulation
I need to insulate my attic. I have a one-story 2300 square foot house. I have no knowledge of what kind to choose or what the cost should be. Can anyone give me any advice? I would greatly apprciate the help.

Thank you-

Augie Dog 12-05-2011 05:26 PM

Do yourself a favor and call an insulation contractor to do it for you. They can educate you about the different choices available. And you may just find that they can do the job for pennies more than you can purchase the material for.

Insulating an attic is a miserable job anyway :no:

woodworkbykirk 12-05-2011 07:31 PM

augie is correct. i had blown in done in my walls earlier this year through my insualtion contractor. i priced it up doing it myself and compared to his cost.

it would have taken me a day and a half just to drill the holes.. and another day to blow in. his guys had it done in one day for $1100

camato6600 12-05-2011 09:32 PM

Yes, thank you. I wasn't planning to do it myself. I'm a woman and have NO idea how to do anything like that. I just wanted to educate myself before the insulation contractor comes to measure and give me an estimate. I wanted to get an idea of cost per square foot and of the different kinds. I live in So California, but in Winter, temps do get down in the 40's at night and sometimes in the 30's as well. Any thoughts on what kind i would need and the cost?

Thank you!!

camato6600 12-05-2011 09:36 PM

I agree Kirk. How many square feet did you have done?

gma2rjc 12-05-2011 09:52 PM

You're smart to ask questions, but do a LOT of research and learn as much as you can about insulating. That way, when you talk to the contractor, you'll have a good idea of what he's talking about and what questions you need to ask.

One thing to think about is having your attic sealed before he adds the insulation. Unless it's been sealed in the past.

camato6600 12-07-2011 11:23 AM

oh no...what does sealed mean?

M3 Pete 12-07-2011 11:48 AM


Originally Posted by camato6600
oh no...what does sealed mean?

Typically it means sealing every interior wall where it meets the top plate, every light box or recessed light, every pipe that enters the attic, and every HVAC opening (and sealing the HVAC ducts is a good idea too). It usually means many cans of expanding foam like Great Stuff.

The object is to eliminate airflow between the living space and the attic, which will improve insulation performance. This includes elimination of air flow in the walls, which is why you seal the top of the drywall to the top plate (2x4 that is at the top of every wall)

camato6600 12-07-2011 11:53 AM

nevermind on the sealing question. i understand that you mean sealing around fireplace, pipes, etc. anyone know the R grade that is recommended in Southern California (San Diego County)?

camato6600 12-07-2011 12:15 PM

Thank you, Pete!! Any thoughts on the R factor...i see in order to qualify for the rebate it needs to be R-30. However, i was told that R-19 is adequate for my zip code (92009). Also wondering about the spray versus blown in or manually laid (Batt). Thank you all so much for the help/advice. I feel so prepared for today's meeting.

M3 Pete 12-08-2011 12:52 PM

R19 should be fine for your area along the coast in Carlsbad. As you probably know, many older homes built in So Cal have no insulation at all, since it rarely gets below freezing, and in your coastal area it probably does not get much over 85 in the summer.

Blown in cellulose is generally thought to be superior to fiberglass batts.

Spray foam is best of all, but it's overkill for your area and fairly expensive. But it seals everything so there is no chance of airflow.

I'd go with whatever is cheapest, since your heating and air conditioning costs are probably not that high to begin with, so the amount of money you save by insulating the atic is not going to be as substantial as somebody living in Canada. Think about how long it will take to pay back your investment (savings per month times x number of months to reach the cost of insulation)

hammerlane 12-09-2011 12:20 PM


Originally Posted by camato6600 (Post 787050)
but in Winter, temps do get down in the 40's at night

:laughing::laughing::laughing::laughing::laughing: :laughing: don't mean to laugh but you don't need no stinkin insulation.

Anyway assuming your attic is 2300 sq feet, and has some insulation already, a roll of unfaced R-30 roll insulation is about $10 from Home Depot. The roll is 15 inches(1.25ft) wide x 25 feet long for a total of 31.25 ft per roll. Your attic would need 2300/31.25 = 74 rolls. At $10 each plus tax about $800. Then figure in renting a uhaul to get 74 rolls of insulation home.

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