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Old 07-07-2018, 11:45 PM   #16
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Oklahoma City. Not much snow, but fairly cold and dry winters.
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Old 07-07-2018, 11:52 PM   #17
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Re: HELP! Blown in insulation

Originally Posted by [email protected] View Post
Oklahoma City. Not much snow, but fairly cold and dry winters.
The HVAC people would sooner see you insulate the roof sheeting.

Others will be along that will know more about your area.
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Old 07-08-2018, 03:32 PM   #18
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Re: HELP! Blown in insulation

I'll try to catch up here with notes as I read each post:
1. "I have been researching DIY blown in insulation, and I have read several times that it is worthless unless you properly air seal the attic first." Not exactly true. Certainly much better to air seal before you bury everything in insulation but the insulation will still function very well. Any air that leaks into the attic will create an additional loss but the r-value of the insulation remains basically unaffected. Two separate paths for energy transfer. But air sealing is a big path so best to take care of it.

2. " but what about my furnace closet? It is completely open to the attic."
Allowing your furnace to essentially be located in the attic is a major issue and expense. Without being there my advice would be to close off that ceiling from the attic, insulate, and then deal with the appropriate combustion air source for that furnace. Converting that attic to conditioned space would be a project. Any ducts that end up going through the attic as it is, unconditioned, need to be air sealed and insulated.

3. I'm not familiar with fire codes but have dealt with needing two layers of 5/8" drywall on the ceiling of a furnace room, all-be-it it was a commercial building. But I have never seen a furnace room open to the attic which is a bit different than installing an approved furnace up there.

4. Gable vents are usually high vents. To allow natural air flow you will want a source of intake air down low, and soffits are a common location.

To sum it up, air seal and insulate both attic floor/ceiling and any ducts up there.
Resolve what you want to do with that furnace closet. Remember there are clearances needed for service work and fire rated drywall as needed to meet current codes. There are combustion air kits for some furnaces and I think drawing air from the attic may be allowed but be sure the code people approve.

All for now
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