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Old 12-13-2010, 05:46 PM  
lk2121
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Default 10 years old home attic insulation

Hi.

I have a 10 years old 2 story home in Pittsburgh. My question is when I checked attic insulation and found 6-7 inches evenly spread blown-in insulation. But I heard from someone in my neighbor told me this should be enough insulation. I searched and studied found at least 19 inches of insulation on attic which should be R-49 is required. I checked temperature 1st and 2nd floor had 3-4 degree different. Do I need a more insulation or this should be enough.

Thanks in advance.



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Old 12-13-2010, 08:58 PM  
GBR
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Enter your zip and info: Insulation Fact Sheet

How much is too much? http://www.enersavesystems.com/pdf/Economic-Thickness-of-Thermal-Insulation.pdf

Test: Home Heat Loss Calculator

Air sealing the attic is just about as important as enough insulation: How to Seal Attic Air Leaks | The Family Handyman

http://www.google.com/url?sa=t&source=web&cd=20&ved=0CDcQFjAJOAo&url=htt p%3A%2F%2Fwww.buildingscience.com%2Fdocuments%2Fgu ides-and-manuals%2Fgm-attic-air-sealing-guide%2Fat_download%2Ffile&rct=j&q=attic%20air%20f lows&ei=2pPNTOjIFYOBlAe22uzuCA&usg=AFQjCNEV_sFpJPB 8DwLjAd-t6PJoO842EQ&cad=rja

Gary



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Old 12-14-2010, 04:39 PM  
lk2121
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So, I still need to lay more insulation. Then from the insulation fact seet I need R49 19inches. I am thinking put R30 which is 9 1/2 inch thick so combine together will be 7+9 1/2 will be 16 1/2. Do I need more insulation to make 19 inches or will be OK or need put more 2 1/2 inches?

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Old 12-14-2010, 09:37 PM  
nealtw
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Thats a good start. Keep an eye on how fast the snow melts off the roof, don't forget to make sure you don't block the vents from the sofets

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