Insulate knee wall in Cape Cod

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Old 06-01-13, 04:37 PM
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Insulate knee wall in Cape Cod

Hello, hopefully someone will be able to help me with my renovation of a knee wall in a cape cod style house in Maryland. The general guidance seems to be that you would insulate the inside wall of the knee wall and the floor (the ceiling of the first floor).

The problem I have in my knee wall is that I have plumbing (hot and cold water supply and drain) running in the knee wall. Additionally, my knee wall does not have any ventilation. Due to the plumbing, I'm thinking I should insulate along the roof and the exterior wall. Is this correct?

To provide a little more information, my roof is only 2x6 rafters and my exterior wall is 2x4. My interior walls are also 2x4. The house will be a rental so not looking to spend crazy amounts of money but want to make it somewhat efficient.

Please let me know if I can provide any other information. Any help is appreciated!
 
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Old 06-01-13, 05:54 PM
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Welcome to the forums! Pictures would be nice, since we can't see what you see. Not that you mentioned it, but I am assuming this is in an attic room?? Ideally the insulation above attic rooms will need baffles to aid in allowing air to move from soffit vents to the ridge vent and out. With a cape, you don't have soffits. Still, moving the hotter air up and over the room is the best way to go. We may be able to have advice posted regarding cape style roof vents. We don't have capes in the South, so we don't work on them. http://www.doityourself.com/forum/el...your-post.html
 
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Old 06-01-13, 06:45 PM
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I will take some pictures tomorrow and post them. It is the second floor of my house. I appreciate the warm welcome!
 
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Old 06-02-13, 04:27 PM
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Here are pictures of my situation. I had started to put up insulation on the outside wall but then realized that may not be the best choice. In looking around up there, I noticed that I have some very slight venting at the edge of the roof. Not sure if it really does that much. Any help is appreciated!!
 
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Old 06-03-13, 08:49 PM
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Insulation should be installed on the kneewalls, against the interior drywall, with a vapor barrier between the drywall and the insulation.

Why can we see through the joists to the floor below?

I noticed that I have some very slight venting at the edge of the roof. Not sure if it really does that much.
It sounds like you're referring to soffit vents. Intake vents in the soffit, paired with a ridge vent for exhaust, are usually one of the most effective methods for keeping sttic insulation dry and effective.
 
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Old 06-06-13, 04:25 PM
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I added some numbering so I can understand your response. So you are saying I should insulate #1, and then where?

So what I have is soffit vents? Pictures I have seen always seem to show it as having an overhang and then the vent - sort of like this: http://www.epa.gov/indoorairplus/tec...s/large/36.jpg

I am replacing the ceiling drywall on the first floor which is why you can see through right now.

Appreciate all the help!
 
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Old 06-07-13, 05:31 PM
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I added some numbering so I can understand your response. So you are saying I should insulate #1, and then where?
The "floor" - #4. Vapor barrier towards the conditioned space. Keep the plumbing inside the insulation.

So what I have is soffit vents?
IDK. That's what it sounds like you have when you say
I have some very slight venting at the edge of the roof.
How about a picture of what you have?
 
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