Is This A Bad Idea? (attic) - Building & Construction - DIY Chatroom Home Improvement Forum

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Old 03-28-2010, 09:25 PM   #1
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Is this a bad idea? (attic)

One downer to a home we otherwise love, is that it lacks storage space. We've thought of several options to add it, but none of them are great. Until this. But.. I have a feeling its got a huge flaw I don't realize - because I've never seen it done... Hoping you guys can chime in.

Here's the idea:

We have a good attic, with a walk up stairway, not a pull down stair. The pitch of the roof is too low (ranch) to ever accomodate living quarters. Sure, we put lots of things up there that don't need climate control, but we'd really benefit from more space for clothes and things that can't take the 130 degrees/humidity of the attic.

So, why not build a closet in the attic, and extend HVAC venting up there to create basically a "conditioned box" within the attic. It would need to be insulated around it, just like it's a continuation the room below.

What are the flaws in this?
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Old 03-28-2010, 09:28 PM   #2
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I'd make the whole closet an attic
Build knee walls & insulate them
Insulate the rafters - with vents against the roof deck

Where are you located ?

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Old 03-29-2010, 05:52 AM   #3
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one flaw is most building insulate and/or air seal these areas incorrectly. The joist space below and the rafter space above the knew wall must be air sealed. This can be done with blocking or rigid foam. Either one is then sealed in place with spray foam. Be sure to seal all attic floor penetrations. Seal the attic access door. Do not block the attic venting. the top plate over the exterior wall needs to be covered with adequate insulation to avoid ice damns.
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