Attic Slope Roof Insulation - behind knee wall

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05-01-04, 04:53 AM

joemcc

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Attic Slope Roof Insulation - behind knee wall

I'm finishing off my attic and am about to insulate the attic roof (slope roof). I'm wondering if I should put the insulation all the way down to the eaves (which will require about 4 feet of insultion once I get past the knee walls). I'm wondering this because I am going to put insulatin behind the vertical knee wall also.

Is it better to put insulation on the slope roof all the way down to the eaves and insulate behind the knee wall?

Thanks!
Joe

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05-01-04, 07:05 PM

resercon

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http://www.urbanoptions.org/pages/insgraph.htm#attics

There are some graphics under "Kneewalls and Slopewalls" that may interest you.

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05-02-04, 05:05 AM

joemcc

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Thanks for the website. This site did help, but I did not find the answer the my question above, which is:

If I'm putting insulation in my knee wall, is it better to insulate the roof (slope wall all the way down to the eaves or should I stop insulating the slope wall once I hit the knee wall?

There was one graphic that looked as though it put insulation at the knee wall and the floor behind the knee wall, but not the slope wall behind the knee wall. It did not have any text about this, though... I'm only guessing that that's what it is indicating to do.

Thoughts?

Thanks!

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05-02-04, 01:15 PM

Ed Imeduc

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Quote:

If I'm putting insulation in my knee wall, is it better to insulate the roof (slope wall all the way down to the eaves or should I stop insulating the slope wall once I hit the knee wall?

Id say stop . On that slope wall that is part of the ceiling of the room there you should have foam rafter vents so the insulation dont touch the roof. Then down the knee wall to the rafter below then across in the rafters to the out side plate. With a foam rafter vent so air can get in there from the vents in the over hang .

ED

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05-02-04, 02:49 PM

joemcc

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Ed,

I need some clarification.
This is what I heard you say:

1) Install the insulation on the slope wall from the ridge vent down to the knee wall.
2) Then run the insulation behind the knee wall (vertical) to the floor.
3) Install foam rafter vent on the slope wall from the ridge vent to the knee wall and then continue the foam rafter vent on the slope wall past the knee wall all the way to the vents in the overhang.

Is this right?
Should I install the rafter vents all the way down to the vents in the overhang but only install the insulation on the slope wall to the knee wall?

Thanks so much for your help. I think this is what you said in your last note, but I am not sure.

Thanks again!
Joe

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05-02-04, 03:54 PM

Ed Imeduc

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Quote:

1) Install the insulation on the slope wall from the ridge vent down to the knee wall.

With the foam rafter vents so the insulation dont touch the roof.

Quote:

2) Then run the insulation behind the knee wall (vertical) to the floor.

YES

Quote:

3) Install foam rafter vent on the slope wall from the ridge vent to the knee wall

same as in #1

You only need that foam vent in the rafters there right at the outside plate.Or where the roof and ceilings rafters meet. So air can get in there from the vent holes in the overhang of the home over the ceiling insulation and over to the knee wall.

ED

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