Adding more attic insulation cost effective?

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Yes, no, definitely, and maybe.
Putting additional insulation is a good idea, particularly up there where the heat rises and leaks out. Also, where the heat comes in from the hot roof.
That being said, there are several other things that can be done cheaply that will help, sometimes SUBSTANTIALLY.
Check ductwork and if needed use NEW GOOD foil type tape rather than cheap duct tape. It is surprising how much leakage there is from tape deteriorating or not being put on properly, if at all. Just plain taping around all ducts and connectors is a good idea.
Check ALL connections, and if necessary, caulk and add screws.
Before you just blow in the ceiling, get around up there and see if there are any places where insulation is plain missing, not put in right, not fitting right, etc.
When blowing in new, be sure to get out to the edges, where it's hard to get. Use a broom handle if you have to to push it out there.
Install those little foam sheets in all the receptacles and switches. They're cheap and effective.
Check windows and all openings. Many times, there's large air losses around vents and anywhere something perforates the perimeter of the capsule.
I'll bet by the time you are finished, if you do a thorough job, you will be surprised by how many leaks and shoddy installation mistakes you can find. Use cheap weatherstripping where you have big gaps.
Lastly, do a pressure test, which can be as simple as mounting a fan in a piece of plywood in a window. Make the air flow in to get the pressure inside positive. Then get a piece of cotton rope and light it so it smokes. The smoke will follow any drafts. Check with your local power people and power conservation groups to see if they will bring their high dollar infrared stuff out and give you a free or cheap analysis.
Yes, insulating more is good. But there's a lot of free and cheap things that will get you even more tightness and lessen power bills.
Good luck.
Steve
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What kind of ductwork are you talking about? Ductwork made of Duct Board, should be sealed with something like RCD #6 Mastic, and not tape.

What connections are you talking about?

What do you mean by "foam sheets"? Are you talking about the foam surround for outside electrical outlets?

I prefer Gonesh # 8 :)
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wrote:

What kind of ductwork are you talking about? Ductwork made of Duct Board, should be sealed with something like RCD #6 Mastic, and not tape.

What connections are you talking about?

What do you mean by "foam sheets"? Are you talking about the foam surround for outside electrical outlets?

I prefer Gonesh # 8 :)
You obviously have your mind made up and are looking more for an argument than information.
I will put it as simply as I can for you:
Insulation is not the only thing in the system. Check everything, make everything right, and your system will work more efficiently.
There.
Did you get THAT?
No?
Sigh ............
Steve
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I'm not looking for any argument. I made a comment about the correct way to seal ducts, and asked two serious questions...if you don't want to answer them, fine.
Sorry you took my post the wrong way.
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1. yes, you can benefit from a foot of insulation (r49 if it's a foot of cellulose) 2. yes
s

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snipped-for-privacy@privacy.net wrote:

More insulation is good but good attic ventilation is important as well.
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On Jun 30, 4:51 pm, snipped-for-privacy@privacy.net wrote:

The very best thing to do is, throw the batts away and replace them with at least 5 inches of poured poly foam. Batts are not a good insulation as the air and water vapour pass through them. What makes poly foam work is, it fills all the gaps and spaces making an airtight filling. It is the gaps that let the air move in and out that carry the heat. Fix the gaps, solve the problem. Perry525
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Wont laying more batts across existing ones achieve close to same results tho?
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snipped-for-privacy@privacy.net wrote:

If there's a backing layer, to a pretty decent degree, yes.
Fiberglass is excellent insulation but it it does need an air barrier in conjunction as the point that air will infiltrate through is correct. I'd recommend ensuring there aren't air leaks, however, rather than removing the existing insulation as the more cost effective solution.
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