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Old 01-07-2010, 04:02 PM   #1
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Insulatign Cathedral Ceiling


Hey everyone. I am in the process of redoing my bath upstairs in my 1950s built, story and a half home. I have some walls off and noticed that the insulation they currently have is not sufficient. I am looking to make the entire upper level into an open cathedral/vaulted type ceiling and have been reading what ever I can find on insulation.

I am looking for ideas as to how I can insulate the ceiling under b, which will be the underside of the roof, in the rafters where they have 2x6s. d is the ceiling piece that I am looking to remove entirely. The problem that I keep running into is that I want to close up the two vents, letter a, on the sides of my home to fully inclose the upstairs. Also, what kind of ventilation is needed for section b, e and within the crawl spaces?

Any ideas are welcome.

Please reference the attached pdf for the labeled diagram.
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File Type: pdf Insulation.pdf (17.5 KB, 57 views)

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Old 01-07-2010, 04:08 PM   #2
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Insulatign Cathedral Ceiling


What is the current height of the ceiling - wall "C"

Where are you located ?

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Old 01-07-2010, 04:22 PM   #3
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Insulatign Cathedral Ceiling


About 7.5 feet, give or take 3 inches
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Old 01-07-2010, 04:22 PM   #4
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Insulatign Cathedral Ceiling


Minnesota, suburb of Minneapolis
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Old 01-07-2010, 04:33 PM   #5
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Insulatign Cathedral Ceiling


Multiple possible issues
Main problem is that the boards going across at "D" to make the ceiling might be required as part of the roof
Do you know the span - the distance from the middle of the room all the way out to the outside wall

With 2x6's you will need to furr these out in order to install R38 insulation
Is this entire area already living space?

You would need a ridge vent to replace the gable vents
Rafter vents are then placed in each rafter bay for ventilation
You need 12" of space for the rafter vents & insulation
So you need to add another 2x6 to the existing 2x6's to make them depthwise equiv to a 2x12
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Old 01-07-2010, 10:17 PM   #6
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Insulatign Cathedral Ceiling


Ridge board and collar ties is what you have. You need a ridge beam (engineered) to get what you want: http://books.google.com/books?id=E5S...20beam&f=false

Be safe, Gary

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