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Old 05-12-2010, 05:50 PM   #16
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Need advice on vaulted ceiling insulation


Thanks for the advice. Even if I do pack it with cellulose, I don't know if I'm getting enough R-value to really cut down the heat at the expense of airflow. There's no source of humidity below the vaulted room, just the front living room.

I guess someday I'll have to pay someone to rip down the drywall and add a deeper vaulted area to accomodate R-30 and airflow. Any idea how much that would run me for a 20'x12' room.


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Old 05-12-2010, 05:53 PM   #17
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Need advice on vaulted ceiling insulation


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You want to blow in 5.5" of insulation & think that will solve everything ?
Its your house, do what you want
R30 is what they recommend as a Min
So your recommendation is don't do anything? I don't think anyone has suggested that 5 1/2" of cellulose will "solve everything". It's only a partial solution. But the ROA will likely be much higher than your proposal of "Holmes on Homes" guerrilla tactics.
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Old 05-12-2010, 06:00 PM   #18
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Need advice on vaulted ceiling insulation


If its worth doing, its worth doing right
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Old 05-12-2010, 06:31 PM   #19
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Need advice on vaulted ceiling insulation


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If its worth doing, its worth doing right
uhoh i got to fix some stuff
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Old 05-12-2010, 06:36 PM   #20
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If its worth doing, its worth doing right
OK - I'll buy into that. But there's more than one way to skin a cat and "Holmes on Homes" guerrilla tactics aren't always the only solution.

He's got maybe R5 or R6 there now with convection problems. Dense pack cellulose nets about R3.5 per inch. 5.5 x 3.5 = about R19 with less convection. R values are victims of diminishing returns. The 1st R19 gives a better ROA than the 2nd R19.

I agree the best solution is to add more insulation depth and vent against the sheathing. But, he can increase his comfort level and pocket some savings in the interim to pay for that major project. And he could insulate upwards when it's time to re-roof.

Cheers.
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Old 05-12-2010, 06:39 PM   #21
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vent against the sheathing
What does that mean?
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Old 05-12-2010, 06:41 PM   #22
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uhoh i got to fix some stuff
some...dontcha mean a lot
I've saved the cost of new windows in the entire house on lower heating costs over the past 5 years

Paying for the correct way ONCE is much cheaper then paying to have it done twice
R30 is my min insulation on pre-existing 2x10 rafters
Everything else is R38 min with some areas R49 or higher
Orig 2nd floor ceiling insulation was R7
I ripped the ceiling down & put in R30 & R38
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Old 05-12-2010, 06:42 PM   #23
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OK - I'll buy into that. But there's more than one way to skin a cat and "Holmes on Homes" guerrilla tactics aren't always the only solution.

He's got maybe R5 or R6 there now with convection problems. Dense pack cellulose nets about R3.5 per inch. 5.5 x 3.5 = about R19 with less convection. R values are victims of diminishing returns. The 1st R19 gives a better ROA than the 2nd R19.

I agree the best solution is to add more insulation depth and vent against the sheathing. But, he can increase his comfort level and pocket some savings in the interim to pay for that major project. And he could insulate upwards when it's time to re-roof.

Cheers.
i agree with that if its a financial wait. i also worry about nail pops after packing if not filled correctly
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Old 05-12-2010, 06:42 PM   #24
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http://www.diversifoam.com/certivent.htm
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Old 05-12-2010, 06:45 PM   #25
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i agree with that if its a financial wait. i also worry about nail pops after packing if not filled correctly
From my experience, if a 1967 drywall ceiling hasn't nail popped yet, it won't show any pops with a Lowes cellulose blower. I'd be more concerned about getting a dense enough pack.
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Old 05-12-2010, 06:51 PM   #26
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Need advice on vaulted ceiling insulation


Paying for the correct way ONCE is much cheaper then paying to have it done twice

That's not necessarily so and certainly not true in this case. If he's DIYing this, he probably won't spend $400 to go from R-nothing to R19. Give me a cost estimate on your proposal and lets compare ROA.
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Old 05-12-2010, 06:54 PM   #27
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One estimator quoted me $207 to fill the vaulted area as best they could with cellulose. That was in addition to the rest of the attic which they quoted me $1145 for faced R-30 batt installation and $700 to clean out the old insulation.
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Old 05-12-2010, 06:58 PM   #28
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One estimator quoted me $207 to fill the vaulted area as best they could with cellulose. That was in addition to the rest of the attic which they quoted me $1145 for faced R-30 batt installation and $700 to clean out the old insulation.
Is the R30 in flat ceiling area? I'd leave the old insulation and blow cells over it in that area as well in most scenarios.

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Old 05-12-2010, 07:08 PM   #29
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Need advice on vaulted ceiling insulation


It is flat. I was going to do blown in but I'm going to be doing a lot of installation of lights, fans, etc, so with the blown in I wouldn't be able to see the joists to walk on cause they're only 6" high, so I decided to go with batts.
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Old 05-12-2010, 07:14 PM   #30
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It is flat. I was going to do blown in but I'm going to be doing a lot of installation of lights, fans, etc, so with the blown in I wouldn't be able to see the joists to walk on cause they're only 6" high, so I decided to go with batts.
Put some walkway boards down where you need them before you blow or better yet, put your lights and fans in first. Be sure to use IC rated units.

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