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Old 11-17-2009, 11:49 AM   #16
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My own insulation questions, what to buy?


While the notches may let some air in, they are not vents

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Old 11-18-2009, 02:31 PM   #17
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My own insulation questions, what to buy?


I think you mean I should install some? The house was built in 1982 and I think it must have been OK all that time. If I really need them I will wait until next summer.

For now should I install new vents because mine are cardboard and there are only a dozen or so. From there is it as simple as rolling out the new insulation?
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Old 11-18-2009, 06:57 PM   #18
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My own insulation questions, what to buy?


Here are two types of soffit vents: http://www.lowes.com/lowes/lkn?actio...1WH&lpage=none

And in your application:

From: http://www.floridadisaster.org/mitig...ks/soffits.asp
Have any ice dams? Be safe, Gary
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Old 11-19-2009, 12:10 PM   #19
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My own insulation questions, what to buy?


I think what I'm going to do is install the vent panels in every third joice space. Then I will roll out new unfaced insulation perpendicular to the old stuff.

Next summer I will look into installing soffit vents.
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Old 11-19-2009, 01:55 PM   #20
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My own insulation questions, what to buy?


The old fiberglass insulation is fine and you would be wasting money to replace it. Just add the new on top of the old perpendicular to the joists. Put the cardboard or foam vent channels in every rafter bay. But they won't do any good until you actually install soffit vents.
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Old 11-19-2009, 04:07 PM   #21
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My own insulation questions, what to buy?


Looking at your soffits and the fact they don't have ventilation in them makes me beg the question if your ridge has ventilation. What kind of ventilation do you have (I might have missed it). I added soffit ventilation to my house and it is a pain in the .

Fiberglass insulation does not deteriorate over time. Pull out your 25 year old winter jacket or blanket, I bet it is almost as warm if not still as warm as it was 25 years prior (if the moths haven't gotten to it). Fiberglass is glass, it's almost the same as it was when installed.

Air seal the attic first, the more insulation you add the more you have to worry about them. Previously with less insulation any moisture build-up could more readily evaporate. After adding the insulation you reduce how easily it can escape and it can build-up. You don't want that, to compensate for moisture having a harder time escaping you need to reduce the amount of moisture escaping (air leaks).

I would blow cellulose, fiberglass FYI each piece has to be removed, fluffed up meticulously to correct height, cut precisely around each and every obstacle, if you have just a 1% air gap around the edges it can reduce the R-Value of that insulation piece by 20-50%, it's the worst insulation at reducing air leaks, and you're supposed to use a putty knife on the edges to make sure they're perfectly square because any bends/lips you risk creating a channel for air to flow through. It's so difficult to install correctly many of todays books say the only way to get the full R-Value from it is to cover it with blown cellulose. It took me days & days to install fiberglass batts in the attic of my house and fluff, cut it precisely around each obstacle, and make sure no gaps, bends, bows, or lifted edges I would never do it again.

Use blown cellulose, it's cheaper, you and your wife will have the whole thing done in a day, the machine to blow it is often free with the purchase of # of cellulose bags, and putting cellulose on top of your current fiberglass will increase your fiberglasses R-value to its rated R-Value, and cellulose is better at reducing air leaks. If you need to walk through it, no prob shovel it out of your way with a kids shovel and then shovel it back. It's hard to remove existing fiberglass batts and then put them back and not have a 1% or more air gap. I been there.

Last edited by Piedmont; 11-19-2009 at 04:17 PM.
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Old 11-21-2009, 12:27 PM   #22
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My own insulation questions, what to buy?


In review:

There are no soffit vents in my split level house. I am working on the upper section first, they are divided and one cannot be accessed from the other. On the side that is on the end of the house there are 21 spaces between the joices and there are 5 cardboard baffles installed. I went up there and closed the lid. I lit a match and blew it out. The smoke sucked straight out of the roof vents. According to what I have read it means that ventilation is very good. Why? I have no clue. There is one spot where the two roofs meet (if that makes sense) where there is a gap I can stick my fingers through to the outside. (see arrow in photo) There is no moisture damage whatsoever and it has been like this since 1982.


I looked at my Dads house built in 1961 and added on to in the seventies (he did the work). He installed "plug" vents in his soffits. The are ~2 inches in diameter. It would seem to me the easiest way to solve my problem, a bag of vents and a hole saw. Maybe some caulk?

Today I am going to buy baffles for this upper section and insulation wrap for the ducts. I am guessing it would be a bad idea to wrap the furnace duct and the sewer vent with the insulation wrap?

I spoke to some construction friends of mine and they say they have never heard of sealing the attic before. I'm assuming you mean sealing the attic from the downstairs. In that case I think it is sealed pretty well except for the access panel to the attic.
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Old 11-21-2009, 07:15 PM   #23
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My own insulation questions, what to buy?


I installed six baffles in two hours. It was a monster job. I got a nail in the head and somehow I feel like I'm doing more bad than good because I have to pull the old insulation back to slide the vent in. I don't think it's worth it.
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Old 11-22-2009, 12:16 PM   #24
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My own insulation questions, what to buy?


Quote:
Originally Posted by Hurriken View Post
I installed six baffles in two hours. It was a monster job. I got a nail in the head and somehow I feel like I'm doing more bad than good because I have to pull the old insulation back to slide the vent in. I don't think it's worth it.
I had to put some vents in too. It's a real drag putting them on from the inside. I looked at those pre-made vents, but they cost so much. I just drilled holes and stapled fiberglass screen on from the inside. Since the vinyl siding covers the vents I don't see any real need for the vent covers.

The vents will let the attic stay cooler in the summer, so you'll spend less on AC. An interesting thing is they help in the winter too. Without soffit vents your attic will draw air up through the gaps in the light fixtures.
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Old 11-22-2009, 07:11 PM   #25
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My own insulation questions, what to buy?


I'm going to be needing to deal with the insalation in my attic of the house we just moved into -- the idiot contractor who did the bathroom renovations for the previous owners pulled insulation in the areas where the bathroom fan vents were installed and never put it back .

All the info in this thread is great. One question I have is if I go with the blown in insulation can I still install some sort of flooring in the attic so I can use it as storage or does the blown in stuff negate that option?
Thanks
J
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Old 11-23-2009, 10:15 PM   #26
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My own insulation questions, what to buy?


This video is helpful.
http://www.monkeysee.com/play/14605-...-to-your-attic
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Old 11-24-2009, 09:22 AM   #27
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My own insulation questions, what to buy?


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Originally Posted by Hurriken View Post
That was helpful- thanks. There are lots of other good videos on there too

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