I am blowing in dense pack cellulose insulation into 9 1/4″ rafter bays. I have 640sqft to insulate and I can not find anywhere about estimating dense pack quantities. Does anyone have any ideas.
Simon
I am blowing in dense pack cellulose insulation into 9 1/4″ rafter bays. I have 640sqft to insulate and I can not find anywhere about estimating dense pack quantities. Does anyone have any ideas.
Simon
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Replies
Ask these guys.
Can't open the attachment. If that's just a URL, include it in the text rather than attaching it.
http://www.regalind.com/regal_wall.htm
Thanks Dan.
That's actually pretty easy. Figure the volume of your wall cavity in cu. ft., then multiply that number by 3.5, as in 3.5 lbs per cu. ft. That'll give you the weight of cellulose that you need, so simply divide that number by the weight of the cellulose bales, which are, I think, 27 lbs. Add a little for waste, or don't remove the volume of the studs from the wall calcs.
Arguing with a Breaktimer is like mud-wrestling a pig -- Sooner or later you find out the pig loves it.
As with most things, it's easy when you know how.
Thanks
What would be the formula if you are just blowing in loose cellulose to fill up rafter cavities in an attic (density is much less, I'm sure) ?
Look on the bag of cellulose itself. They usually have the computations printed.
Right. My question was actually just to double check the intention of the original poster. He used the term "dense pack" but also said they were rafter cavities, which may have meant just blown-in loose fill.
r- they are rafter cavities of a vaulted ceiling and therefor need to be dense packed.
Simon
Its abought 2lbs a cubic ft loose. So figure 13sq ft per bag at abought 12" deep, which will give you close to R49 which is recomended for attics.
Sorry -- Hope I didn't come across as arrogant.
Arguing with a Breaktimer is like mud-wrestling a pig -- Sooner or later you find out the pig loves it.
no you did'nt