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Old 01-09-2015, 01:38 PM   #1
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Insulating flat roof from inside ceiling


Hello I am currently renovating the second floor of a house. I tore out some walls and have noticed that there is old blown in cellulose. It is very sparse and needs to be improved upon drastically.

I was thinking of blowing in some pink. The joists are 9" deep and this would give me an Rvalue of 32. Not great but much better then what is there. I don't want to have to tear out the ceiling. I am going to blow it in through the existing gaps and cut some new ones.

Any opinions appreciated. Including pics.
Thanks
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Old 01-09-2015, 03:00 PM   #2
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What type of flat roof?

Don't blow it full. The roof system should breathe.

How about a picture of the exterior.
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Old 01-09-2015, 04:19 PM   #3
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Should I use batts instead? If I blow it it will be difficult to leave gaps. I had the roof done this summer it is a 3 layer membrane system.
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Old 01-09-2015, 04:25 PM   #4
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I am starting to believe the cellulose is a much better choice. It does settle but even an inch of it seems to insulate better than 3 1/2 inches of fiberglass.
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