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Old 01-02-2012, 06:26 PM   #1
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Just completed Attic Insulation Project!


First post on the forum for me! My wife and I purchased our first home at the end of summer 2011. The home was built in 1919 and has a fair mix of small projects to complete, mostly in efficiency and insulation.

We had a quote for blown-in insulation which came in at $1800. The insulation 'expert' didn't seem to know anything and refused to quote addressing any issues with ventilation, therefore I decided to do the research and labor myself.

I added R-30 unfaced batts to the existing 2-4 inches of loose fill mineral wool / fiberglass insulation, and also installed ventilation ducts through the roof rafters. In the spring, I will verify whether or not I need to enlarge the soffit vents on the exterior to meet modern ventilation recommendations.

(Photos 3&4) One question I have is how to properly insulate around the chimney. The chimney stack is used for both a gas fireplace and furnace exhaust. Currently, there is roughly an 18" x 'length of the chimney' x 18" deep gap right next to the chimney which has random loose fill insulation in it. I left it uncovered (had it covered in the picture just to see how well the insulation would stay there) for now. Is insulating around a chimney a DIY type job, or is it something that requires a expert in chimney's?

(Photo 5) In the last picture, I found some water damage where the chimney meets the peak of the roof. I can't tell if this was existing staining or recent. We do know that the roof has been replaced with the past 3-5 years. Any advice on how to proceed here?
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Last edited by LuckyFoot15; 01-02-2012 at 06:35 PM.
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Old 01-02-2012, 06:29 PM   #2
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Just completed Attic Insulation Project!


Use unfaced fiberglass insulation.

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Old 01-02-2012, 06:46 PM   #3
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Just completed Attic Insulation Project!


Same as a furnace flue; use metal and fire-foam (unless there is a liner), then insulation: http://www.familyhandyman.com/DIY-Pr...s/Step-By-Step

And page #49 here; http://www.nybtg.com/downloads/therm..._checklist.pdf
I hope you air-sealed the rest of the attic before insulating....

Gary
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Old 01-02-2012, 07:46 PM   #4
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Just completed Attic Insulation Project!


Thank you for the links on how to work around the chimney. That looks like something I can do myself with a little more research.

The ceilings of the house are all plaster. Prior to insulating, I sealed around all the ductwork and electrical that was penetrating the attic. The wastewater vent stack had a 14"x24" hole that you could see directly to the basement...which the previous owner just threw faced batts of insulation down. Thinking of it, I now need to dig into the chimney hole to confirm the previous owner didn't do the same in that hole.

I forgot to follow-up on the first post pricing discussion. Total cost so far has been under $300, minus whatever we'll get back in tax savings. The air-sealing was a $200 additional cost from the contractor...cost me $20 worth of materials at Menards. HA!

Last edited by LuckyFoot15; 01-02-2012 at 07:49 PM.
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Old 01-21-2012, 03:20 PM   #5
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I have more work to do up there. With the snow we just got, it's 24F outside today and the attic is around 40-50F depending on the zone. It's fairly obvious that heat is leaking through the area surrounding the chimney, and the soffitt vents are sufficiently clogged with paint.
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Old 01-07-2014, 11:30 AM   #6
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Just completed Attic Insulation Project!


Just purchased a home built in 1900. Same thing in attic no insulation Did you also insulate along the rafters to the ridge?? I need to add soffit vents, and a ridge vent and then I will add the rafter vents as well....
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Old 01-07-2014, 12:20 PM   #7
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Insulation plane is to follow the envelope layer.

If the attic floor is the air/envelope layer...that is where the insulation goes as well.
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Old 01-08-2014, 08:40 AM   #8
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Quote:
Originally Posted by Windows on Wash View Post
Insulation plane is to follow the envelope layer.

If the attic floor is the air/envelope layer...that is where the insulation goes as well.
Can you explain in DIY terms Not sure I fully understand what the "envelope layer" is

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