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Geo NR Gee · 08-13-15, 01:19 PM

I have been considering installing more blown-in insulation onto the existing blown-in already in the attic space. Its been in the 80's outside here and hotter in the attic, but I want that extra insulation benefit inside the living space for the winter also. I have help now from the boys before they get back to college, so we have to get it done in the next week.

There is a local insulation installer that has retired and is clearing out his inventory. He has bags of 30# for $11.99 each. The local box stores have 15# bags for $18.99 a bag. So a pretty good savings I figure.

I have about 950 Sq. Ft. of attic space to cover. Some of the existing insulation has been pushed aside where I navigated to add boxed covers to can lighting boxes and bath fans, etc.

I was thinking of spreading out the existing insulation to fill in those areas and then use a piece of plywood to flatten it sorta making it more of a dense pack, then blow in the new insulation on top of it. Maybe that's too much work? I don't know. Will that cause problems?

According to his ad, for 1000 sq. ft, one would need
11 bags = R13
17 bags = R19
19 bags = R21
24 bags = R25
29 bags = R30
39 bags = R38
54 bags = R49
69 bags = R60

I estimated that I have about 12 to 15 inches of cellulose insulation in there already. Wouldn't it be be a waste of money to have R60?

08-13-15, 01:19 PM	#1
Geo NR Gee Journeyman EcoRenovator Join Date: Jan 2011 Location: Seattle Posts: 326 Thanks: 109 Thanked 23 Times in 18 Posts	Adding more Blown in Insulation I have been considering installing more blown-in insulation onto the existing blown-in already in the attic space. Its been in the 80's outside here and hotter in the attic, but I want that extra insulation benefit inside the living space for the winter also. I have help now from the boys before they get back to college, so we have to get it done in the next week. There is a local insulation installer that has retired and is clearing out his inventory. He has bags of 30# for $11.99 each. The local box stores have 15# bags for $18.99 a bag. So a pretty good savings I figure. I have about 950 Sq. Ft. of attic space to cover. Some of the existing insulation has been pushed aside where I navigated to add boxed covers to can lighting boxes and bath fans, etc. I was thinking of spreading out the existing insulation to fill in those areas and then use a piece of plywood to flatten it sorta making it more of a dense pack, then blow in the new insulation on top of it. Maybe that's too much work? I don't know. Will that cause problems? According to his ad, for 1000 sq. ft, one would need 11 bags = R13 17 bags = R19 19 bags = R21 24 bags = R25 29 bags = R30 39 bags = R38 54 bags = R49 69 bags = R60 I estimated that I have about 12 to 15 inches of cellulose insulation in there already. Wouldn't it be be a waste of money to have R60?