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Old 03-11-2008, 09:32 PM   #1
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Blow-in Insulation


I just had all the siding removed from my house but before the vinyl goes up I want to insulate my walls. I have 60 feet of 9 foot walls. I need to subtract 5 (3x5) windows. How do I calculate how many bags I need for a 85 year old house in New Jersey? Is it worth it to fill above and below windows?

I read to use roughly one 30-pound bag of cellulose for every three wall cavities and another source said to use 3.5 lbs per square. ????

What's the advantage to a "two hole method" versus drilling only one hole at the top of the stud cavity? Airflow is not a concern with my project, there is a 1/8 gap between all the 1"x8" sheathing.

I called Home Depot and get a free blower rental with the purchase of 20 bags of GreenFiber Blow-in Insulation (thanks for the tip redline!)

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Old 03-11-2008, 10:01 PM   #2
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Blow-in Insulation


Jelly,

Did this a few years ago but here's how I recall it. A bundle of the cellulose gets about 30 square feet. So figure with loss one bundle will give you a 5' by 5' square (thats with 2 by 4 studs in your walls). You need the two hole method, first filling from the bottom, so you will have and idea when the cavity is filled of close to it. Also as your filling from the bottom cover the top hole so the cellulose does not blow out as your putting it in from the bottom. You want to fill every cavity you can get at, around window and doors.
I'm not sure if you plan on doing this from the inside of the structure or the exterior wall. My installation was on the inside walls and went with 2" holes, cutting them out with a rotozip. To plaster afterwards I stuffed newspaper in the hole to give me backing for the plaster repair.


Best of luck with the project, rredogg

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