What am I doing right? – Cellulose
I’m blowing dense pack cellulose in 2×4 walls and I just did some calcs and figure I’m getting 4.75lbs/cu. ft. The last time I did this I was blowing the sheetrock off the walls at 3 – 3.5lbs. No such problems this time. I’m happy with the results but I don’t know what I’m doing different. Any ideas?
Jerry
Replies
Change in the value of G.
Better/thicker drywall, maybe... or screws vs nails.
Troy Sprout
Socialism in general has a record of failure so blatant that only an intellectual could ignore or evade it."
-- Thomas Sowell
maybe instead of the sheetrock, you're blowing the sheathing off.... have you been outside lately ?
Has he checked the basement?
People never lie so much as before an election, during a war, or after a hunt. --Otto von Bismarck
Ck the bag weight. That Coccoon stuff at HD is only 22 pounds a bag.
Joe H
You guys are all very funny :-) Mike - you made me look! Sheathing's still there.Joe - made adjustment for the smaller bags; last time I did this I think the bags were almost 30lbs and cost 30% less.Dan - "...value of G" huh?Hack, All - I did put more screws this time, so I guess that helped, but technique wise, I don't know how I'm getting so much in this time. Is the density I'm blowing at typical? Maybe I just did a poor job last time.Jerry
Just don't slam the door on the way out.I would hate to see all of the wall just Pop Off..
.
Hey every group has to have one. And I have been elected to be the one. I should make that my tagline.
seems pretty high density to me... i'm usually happy with anything over 3Mike Smith Rhode Island : Design / Build / Repair / Restore
I'm with Mark, that density is really high, 3+ lbs per cubic foot is plenty, I don't think more is better in this case. Re-check the math.Garett
Mike,I think you usually do the Mooney wall thing, but have you blown into existing walls and checked your density? I'm wondering if I have the slide plate on the blower closed too much. It's going very slowly.Garett,Standard 2x4 construction gives me 2.72cu ft/bay (92.5 x 14.5 x 3.5). The bags are actually 21.4lbs each. I blew 16 bags into 28 bays which gives me 342.4lbs into 76 cu ft or 4.5lbs/cu ft (and the drywall's still on) ;-)Jerry
we do a test run every once in a while...
wether it's mooney or conventional, it usually comes out to about 3 #
we've got a small bedroom comming up... walls only... drywall... blow, then tape....we'll test the density on that and let you knowMike Smith Rhode Island : Design / Build / Repair / Restore
I might be tired and slow but.... 28 bays @ (3.5*14.5*92.5)=28 bays *4694.375 =
131442.5 cubic inches 13144.25 ci / 144 ci/cf = 912.795 cf
912.8 cf / 342.4 lbs = 2.665 lbs/cfStill good 2.5 in the min to eliminate settling...Garett
Garett,I'm gonna go with just tired. ;-) Just kidding, I appreciate the help. If you blew 342lbs into 912 cu ft you would have .375 lbs/cu ft. You went wrong in the conversion to cu ft. There are 1728 cu in to a cubic foot (12 x 12 x 12 = 1728).
So: 131442.5 cu in / 1728 = 76 cu ft
342.4 lbs / 76 cu ft = 4.5 lbs/cu ft
Your Right... And that's some tuff drywall. Merry Christmas