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Home > Archive > Building and Construction > June 2006 > Estimating CBUs
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| What is the formula to figure out how many cement blocks are needed for a
wall foundation etc? I'm sure this has been asked before but don't remember
seeing it. Also Goggle gave no results. Thanks for any help.
Muff
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| rustyjames 2006-06-29, 9:26 am |
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Muff (nospam) wrote:
> What is the formula to figure out how many cement blocks are needed for a
> wall foundation etc? I'm sure this has been asked before but don't remember
> seeing it. Also Goggle gave no results. Thanks for any help.
> Muff
try cmu or concrete masonry unit. good luck
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| RicodJour 2006-06-29, 9:26 am |
| Muff (nospam) wrote:
> What is the formula to figure out how many cement blocks are needed for a
> wall foundation etc? I'm sure this has been asked before but don't remember
> seeing it. Also Goggle gave no results. Thanks for any help.
Face Area of Wall divided by Face Area of One Block (including grout
area)
add some for wastage.
R
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| keith,alabama,contractor 2006-06-29, 9:26 am |
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RicodJour wrote:
> Muff (nospam) wrote:
>
> Face Area of Wall divided by Face Area of One Block (including grout
> area)
> add some for wastage.
>
> R
try using LxHx1.125, if you know what the approx height is going to be.
in example a crawl space footing with no stepdowns or bulkheads is
usally about 24" so that gives you 3 courses and usally you will have
one course under or at least partially under ground, if so that would
be a 4th course. a concrete masonry unit(block)is 7,5/8 x 15,5/8 when
installed with a 3/8 motor joint gives you 8x16 face side of block. if
you have stepdowns or bulk heads in the footing as a result of uneven
terain it should only step in increments of 8" but more often than not
because of error in calculating sometimes it may be off a bit, but
easily solved by building up your mud bed, or cutting down your block,
and most often adjusting thickness of your mortor joint, and you should
shoot each corner as you build it up with a builders level about every
2 or 3 courses making sure you maintain the same elevation reading or
at least within 1/4" at all corners, and you should always build your
corners up and then lay your blocks to a taut line extended from the
corners lined up at the top edge of the blocks for that course and
repeat that step for each course and you will lay a true and even wall.
im pretty sure that formula will work , its been a while scince ive
estimated for blocks but i think its right, there are a couple of
other formulas but i will have to dig them up. if you know the lenght
of your footing you can multiply that times 12" and then divide by 16"
and you should get the total number of units per course and then if you
know the approximate height , then multiply the total per course by the
number of courses, each course will be 8" high. if you need to know
anything else about the construction of cmu units or anything else in
the construction industry residential or commercial you can email me
at(roykprice@gmail.com) and i will be happy to assist you. and if i
give you information that dont sound just right email me and i will
re-check my self .
| |
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| "keith,alabama,contractor" <roykprice@gmail.com> wrote in message
news:1151543163.156451.326890@y41g2000cwy.googlegroups.com...
>
> RicodJour wrote:
> try using LxHx1.125, if you know what the approx height is going to be.
> in example a crawl space footing with no stepdowns or bulkheads is
> usally about 24" so that gives you 3 courses and usally you will have
> one course under or at least partially under ground, if so that would
> be a 4th course. a concrete masonry unit(block)is 7,5/8 x 15,5/8 when
> installed with a 3/8 motor joint gives you 8x16 face side of block. if
> you have stepdowns or bulk heads in the footing as a result of uneven
> terain it should only step in increments of 8" but more often than not
> because of error in calculating sometimes it may be off a bit, but
> easily solved by building up your mud bed, or cutting down your block,
> and most often adjusting thickness of your mortor joint, and you should
> shoot each corner as you build it up with a builders level about every
> 2 or 3 courses making sure you maintain the same elevation reading or
> at least within 1/4" at all corners, and you should always build your
> corners up and then lay your blocks to a taut line extended from the
> corners lined up at the top edge of the blocks for that course and
> repeat that step for each course and you will lay a true and even wall.
> im pretty sure that formula will work , its been a while scince ive
> estimated for blocks but i think its right, there are a couple of
> other formulas but i will have to dig them up. if you know the lenght
> of your footing you can multiply that times 12" and then divide by 16"
> and you should get the total number of units per course and then if you
> know the approximate height , then multiply the total per course by the
> number of courses, each course will be 8" high. if you need to know
> anything else about the construction of cmu units or anything else in
> the construction industry residential or commercial you can email me
> at(roykprice@gmail.com) and i will be happy to assist you. and if i
> give you information that dont sound just right email me and i will
> re-check my self .
>
Maybe so. But RicodJour's estimate is alot simpler for us walls and so
forth folks. The waste part is probably the most important as all of us are
not master masons.
--
Jonny
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| tmurf.1@juno.com 2006-06-29, 9:26 am |
|
keith,alabama,contractor wrote:
> RicodJour wrote:
> try using LxHx1.125, if you know what the approx height is going to be.
> in example a crawl space footing with no stepdowns or bulkheads is
> usally about 24" so that gives you 3 courses and usally you will have
> one course under or at least partially under ground, if so that would
> be a 4th course. a concrete masonry unit(block)is 7,5/8 x 15,5/8 when
> installed with a 3/8 motor joint gives you 8x16 face side of block. if
> you have stepdowns or bulk heads in the footing as a result of uneven
> terain it should only step in increments of 8" but more often than not
> because of error in calculating sometimes it may be off a bit, but
> easily solved by building up your mud bed, or cutting down your block,
> and most often adjusting thickness of your mortor joint, and you should
> shoot each corner as you build it up with a builders level about every
> 2 or 3 courses making sure you maintain the same elevation reading or
> at least within 1/4" at all corners, and you should always build your
> corners up and then lay your blocks to a taut line extended from the
> corners lined up at the top edge of the blocks for that course and
> repeat that step for each course and you will lay a true and even wall.
> im pretty sure that formula will work , its been a while scince ive
> estimated for blocks but i think its right, there are a couple of
> other formulas but i will have to dig them up. if you know the lenght
> of your footing you can multiply that times 12" and then divide by 16"
> and you should get the total number of units per course and then if you
> know the approximate height , then multiply the total per course by the
> number of courses, each course will be 8" high. if you need to know
> anything else about the construction of cmu units or anything else in
> the construction industry residential or commercial you can email me
> at(roykprice@gmail.com) and i will be happy to assist you. and if i
> give you information that dont sound just right email me and i will
> re-check my self .
Just use 1.125 times the square footage if you are using blocks with an
8 x 16 inch face.
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| keith,alabama,contractor 2006-06-29, 9:26 am |
|
Jonny wrote:
> "keith,alabama,contractor" <roykprice@gmail.com> wrote in message
> news:1151543163.156451.326890@y41g2000cwy.googlegroups.com...
>
> Maybe so. But RicodJour's estimate is alot simpler for us walls and so
> forth folks. The waste part is probably the most important as all of us are
> not master masons.
> --
> Jonny
well, sorry to offend you guy, but i am a master carpenter, and take a
lot of pride in what i do and what ive accomplished in my years of
experience. dont sell your self short tho, you might be more
intellegent than you think. i aint saying that i know everything, but
theres nothing that i cant figure out and to me that what marks a
master. and by the way i am also a master mason 32nd degree lodge
no.423 clanton, alabama F.&A.M.
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