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Old 09-14-2014, 10:31 AM   #1
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Attic insulation


I have a house from 1946 that has no soffits so I only have two rows of four mushroom vents for attic venting. The city I live it would not approve modifying my roof to add soffits. Last year was the first year we had a decent amour of snow since e I've owned the house and we had ice dammit issues. I'd like to try and avoid that this year. We have two layers of fiber glass insulation in the attic now. I was going to add some this year and was wondering what would be the better option. Should I add another level of r30 fiber glass or should I go with blown in and add it on top of what I already have?


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Old 09-14-2014, 11:04 AM   #2
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Gotta air seal before you add anymore insulation.

You can also vent the eaves via other options besides soffits.

There are vented fascia boards as well as smart vent (i.e. roof size low profile vents).

You guys are due for a doozy this winter and you almost got snow this weekend.
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Old 09-19-2014, 02:08 PM   #3
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Good advice from WoW. The ice damming is due to heat loss (seems as though you already figured that out), and air sealing is a must to prevent it. I'd pull back the batting air seal, then blow over the top.
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Old 09-19-2014, 02:37 PM   #4
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Talk to this cat right here above me by the way. He can fix it so it won't ice dam.
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Old 09-19-2014, 02:40 PM   #5
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You describe or provide links for ideas on air sealing?
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Old 09-20-2014, 09:35 AM   #6
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I see quite a price difference between blown in fiberglass and cellulose. Is higher price worth it for fiberglass?
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Old 09-20-2014, 03:16 PM   #7
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Typically cellulose is more expensive around these parts and is a better option (opt for the borate only stuff).

There are a ton of links on air sealing and insulation in this forum as well as on the web.

Start with a video and it will make more sense: https://www.youtube.com/watch?v=8n3QCBw0m74&feature=related
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Old 09-22-2014, 12:48 PM   #8
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Cellulose is generally preferred regardless of price and is typically cheaper as well. The "blow and go" roofing companies are the only guys using fg on a regular basis in most applications.
You can also check out the Focus on Energy program for rebates on that work here in WI.
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Old 11-23-2014, 10:27 AM   #9
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Question,
If starting an air sealing and adding insulation project at an unused attic, is it necessary or recommended to lay down a vapor barrier at the same time, before doing the insulating? If a vapor barrier is recommended, what are options?

I am in the southern NJ area, in a 1950s house, and need to increase insulation quite s but. Plan is to blow in cellulose, once air sealed.

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Old 11-23-2014, 01:09 PM   #10
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No vapor barrier required in a majority of the cases.

Seal the air leaks and bypasses...that is what is carrying the moisture.
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