Baffles In Unevenly Spaced Cathedral Ceiling Rafters - Insulation - DIY Chatroom Home Improvement Forum
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Old 12-28-2017, 12:34 PM   #1
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Baffles in unevenly spaced cathedral ceiling rafters


I am going to be insulating a sloped portion of my ceiling.

I need to install baffles to provide venting from soffits to the upper attic space (1.5 story construction).

It's an old house and the rafters are not exactly on 24" centers. Is it a problem if, in some cases, the baffles to not extend quite to the inside of each rafter?

This is the type of baffle I am thinking of using:

https://www.homedepot.ca/en/home/p.2...000136854.html

They seem to already be designed to not provide a vent channel across the entire rafter bay.

As you can see, there is a spot in the middle where there is no venting, and there's no venting on the edges. In these spots, the insulation is basically in direct contact with the roof. Is it that big a deal, then, if in some wider bays, the vents don't touch the inside of each rafter?
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Old 12-28-2017, 12:41 PM   #2
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Re: Baffles in unevenly spaced cathedral ceiling rafters


That is close enough, it will be fine.
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Old 12-28-2017, 12:42 PM   #3
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Re: Baffles in unevenly spaced cathedral ceiling rafters


It should be fine. If you are concerned about it, you can make your own, but most folks will just go with the store bought units.

They are never airtight so its not a big deal.
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Old 12-28-2017, 01:05 PM   #4
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Re: Baffles in unevenly spaced cathedral ceiling rafters


The hard part when insulating the slope is getting enough insulation to meet codes. I'm not familiar with your requirement but most installs require increasing the depth significantly. Besides being code required you are in a very cold climate so more is better.

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