Posted by Billy NY on June 08, 2013 at 07:37:57 from (72.226.79.200):
In Reply to: mortar question posted by ericlb on June 08, 2013 at 05:31:50:
Typically, CMU is 8x8x16, and = .89 SF per each CMU, x 41 CMU= 36.49 or say 36.50 SF.
8.5 or 9.0 cu.ft. of mortar per 100 SF of CMU, is a common figure for mortar with waste % included. So, if I am not way off or wrong with this calculation, say 100 SF/9.0 cu. ft. ( units are not the same, supposed to always keep units the same when estimating) is it 0.09 cu. ft of mortar per sq. ft. ? 0.09 x 36.50 = 3.285 cu. ft. of mortar ? Off the top of my head it seems proportional to the 8.5 or 9.0 cu. ft. per 100 sq. ft. 50 sq ft. would = 4.5 cu. ft of mortar, so at 3.2 cu. ft. it seems logical my math could be right, don't quote me just yet though LOL !
So if there was .75 cubic feet in an 80lb bag = 4.38 bags, say 5 80lb bags ? If there was .88 cubic feet per bag, then 3.2 cu.ft of mortar needed /.88 cu. ft. per bag = 3.6 bags. Typical CMU you are supposed to get around 13 CMU worth of mortar in one 80 lb bag, so 41/13 3.15, maybe I am in the ball park.
Quikcrete has a caculator on their website, I poked around a few sites to refresh my memory on the numbers, to see if my brain could deal with it this morning LOL !
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