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Old 07-09-2017, 07:18 AM   #1
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Question re Blown-In Insulation


Our house has ~9" of blown-in cellulose in attic -- clearly not enough for south Louisiana summer. I want to have more insulation blown in, but I'm concerned about the insulation flowing into the eave and blocking ventilation. There were no guards installed to prevent that when the house was built late-1980s. Is this a valid concern, or is there a solution?
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Old 07-09-2017, 07:29 AM   #2
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Re: Question re Blown-In Insulation


I assume that you are referring to guards that prevent the insulation from blocking the soffit vents? If so, why can't they be installed now? Can you post pictures of the attic eave area?
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Old 07-09-2017, 08:01 AM   #3
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Re: Question re Blown-In Insulation


9" isn't as inadequate as you think to be honest.

What you are referring to is baffles and they are usually a standard part of an additional insulation blown in job.

You will need them at this point and I would recommend some air sealing along with that insulation (just not in the summer).

https://www.oakridgepoly.com/products-classification/
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Old 07-09-2017, 02:05 PM   #4
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Re: Question re Blown-In Insulation


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Originally Posted by JIMMIEM View Post
I assume that you are referring to guards that prevent the insulation from blocking the soffit vents? If so, why can't they be installed now? Can you post pictures of the attic eave area?
I'm sure they can be installed now, I just hate to get up in the attic to do it. As for pics, I don't see the value -- it's just a typical attic and roof framing, 5/12.
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Old 07-25-2017, 09:14 AM   #5
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Re: Question re Blown-In Insulation


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Originally Posted by JIMMIEM View Post
I assume that you are referring to guards that prevent the insulation from blocking the soffit vents? If so, why can't they be installed now? ...
Update: I bought some guards from Home Depot and started installation. Immediately ran into a problem: Rafters are 24" oc, ceiling joists are 16" oc. Where the ceiling joists run parallel to the rafters (most to attic perimeter), the joists extend all the way out to almost contact the underside of the roof decking -- no way the guard fits in there, especially with roofing nails protruding from the deck underside. I can install the guards on the portions of the attic where the joists are perpendicular to the rafters.

Now I'm wondering what to do -- go ahead and have insulation blown in and just try to avoid filling up the eaves, or maybe place a row of thick batting around the perimeter to provide a stop for the insualtion?
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Old 07-25-2017, 09:36 AM   #6
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Re: Question re Blown-In Insulation


Years ago they would say every third bay would be enough and that was probably for your house.

Some chutes can be cut in half and there different sizes.
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Old 07-26-2017, 07:17 AM   #7
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Re: Question re Blown-In Insulation


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Years ago they would say every third bay would be enough and that was probably for your house.

Some chutes can be cut in half and there different sizes.
I guess "they" decided none was enough...

Anyway, I thought about cutting the guards or purchasing narrower ones -- but would that approach not allow insulation to readily flow out into the soffit, defeating the purpose?
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Old 07-26-2017, 07:22 AM   #8
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Re: Question re Blown-In Insulation


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I guess "they" decided none was enough...

Anyway, I thought about cutting the guards or purchasing narrower ones -- but would that approach not allow insulation to readily flow out into the soffit, defeating the purpose?
You can just poke the end of the chute out into the soffet area and plug the rest of the holes with a piece of batt insulation That contains the blown in.
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Old 07-26-2017, 01:14 PM   #9
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Re: Question re Blown-In Insulation


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You can just poke the end of the chute out into the soffet area and plug the rest of the holes with a piece of batt insulation That contains the blown in.
Sounds like a workable solution!
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