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Old 11-19-2010, 10:06 AM   #1
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Attic Insulation


I have a split level home and the insulation is pretty old. and in the summer the upper level of the house is really hot. i replaced the upper have with R-19 insulation, but now the house seems kind of cold. when I replaced the insulation I put it close to the rafters, do they need to be pushed up against the underside of the roof? oh and I didn't install any rafter vents. Thanks

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Old 11-19-2010, 11:25 AM   #2
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Attic Insulation


The standard for your zone is R38 in the attic. However, this is difficult to accomplish between the rafters.

Is the attic living space? If not, you should be insulating in the floor. The current strategy is to blow cellulose into the floor. You normally get to borrow the machine for free when you buy bags of it. If there's living space, the best way is to install a flat ceiling and knee walls so that you have more room to insulate.

There's a lot to be said about this, so I'll sit back and see what the real experts have to say :-)

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Old 11-19-2010, 12:09 PM   #3
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Attic Insulation


"Feeling comfortable" in your home has as much to do with air movement as it does with insulation level or type i.e if you haven't air sealed your home, and find you have cold zones and drafts, the insulation type won't make one bit of difference to your comfort level.

You might also need a vapour retarder - or some examination of what you already have before deciding on R13, R19 or whatever - level of insulation you should have for your climate.
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Old 11-19-2010, 02:30 PM   #4
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do I need to install a fan on the gable vents?
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Old 11-19-2010, 04:09 PM   #5
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You may. Or may not, depends...there's no way I or anyone else here could tell you that.

There's no one sure-fire solution to what is a whole-house problem; each component affects the nhome-comfort level and it all comes down to fine-tuning. But your attic ventilation is only part of it and whether or not you need a fan up there depends on what problems you have now. Let's not get too far ahead of ourselves.

There are just too many variables to conduct an investigation on-line, I'm afraid.
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