How many bags of mortar do I need per number of 8x8x16 concrete blocks?
I want to build a small basement, know the number of blocks I will need
(around 800), but dont know how to determine the amount of mortar. I
intend to buy raw mortar and add my own sand. I'll just buy a truckload
of sand, which I assume should be more than enough, but how do I
determine the number of bags of mortar? This is a rural area and I have
to drive 55 miles to get it at a reasonable price, so I want to be sure
I have enough. I refuse to buy it locally and pay their outrageous
ripoff prices (for example, the blocks at the building center 55 miles
away are $.89 each, locally, they are $2.40 each).
I bought 8X10X16 at local supply at about $1.60 each. I used 60 pound
premixed mixed bag for about 12 blocks. First time I ever blocked, a window
opening. You can probably find a calculator somewhere.
You don't want to buy it all at once as you will have to store it
somewhere dry and it will deteriorate anyway unless used immediately.
BTW can you can cement over there in waterproof bags?
Premixed stuff is grossly uneconomic.
The strength of the cement you mix will depend on the strength of the
On Tue, 21 May 2013 20:04:18 -0500, firstname.lastname@example.org wrote:
There are blocks and there are blocks. Be sure you are comparing the
same block when comparing prices.
Hauling those blocks 55 miles can be costly too.
You should get about 28 to 40 block per bag.
Instead of block, why not pour a concrete foundation with the
insulation? Set up the ICF's yourself, get some reddi-mix and you are
done. Save a bundle on energy.
In fact, why not build the entire house that way and it is pretty
tornado and hurricane resistant too.
and many others.
I already checked into a poured foundation. The cost is 5 to 6 times as
much as block. I've built with block, not an entire basement, but I've
done the work. It's just one of those things where I'll build a little
every day. There is no huge rush. As far as hauling them, I have
access to a large heavy duty trailer that should handle about 350
blocks, considering the weight of about 40lbs per block. That's three
trips (one with the mortar). I go there every few weeks anyhow, so the
cost of gas wont be all that much more.
The blocks sold locally are from the same company as the much cheaper
ones. In fact someone told me the local place that charges outrageous
prices gets them from the cheaper place 55 miles away. I dont doubt
that at all.
No, I wont buy premixed mortar. Why pay the premium price to have the
sand included, then have to haul the (sand) all that distance. Not to
mention that all premixed concrete products are always weak. Meaning
that whenever I've ever bought premixed concrete, it makes a weak
sidewalk, because there is not enough portland cement added. I'ver
always added more if I'm making a sidewalk or something other than
setting fence posts. I own a cement mixer, so adding sand and mortar is
no big deal, in face having to rip open all those bags seems tedious
compared to just shoveling in sand from a pile and adding a bag of
If you will require multiple trips, then it doesn't matter how many bags of
mortar you'll need for 800 blocks.
Go get your first load of blocks, plus about how many bags of cement you
wild-ass-guess will be required to set the load of blocks.
Get to work.
At some point, you'll run out of blocks or mortar (or both). When that
happens, you'll have an exact equivalence of mortar to blocks and can plan
your purchases and hauling accordingly.
+1 on that. Be sure you get your math right-- Each block weighs
about 40 lbs-- That puts your 800 blocks at about 16 tons. That's a
lot of trips with a one ton truck.
I'd gladly pay the premium to have the local guy deliver them on 9-10
pallets, and distribute them around the site to minimize carrying.
That looks expensive at first--- but it is a crap-load less work, and
a better job in the long run.
I'm guessing that a lot of people are still more comfortable with block
than with forms... and I imagine you could get a lot of the same
benefits by applying foam insulation to the block afterwards.
However for a truly strong wall if using block you would probably want
to fill all the voids with rebar and concrete rather than just relying
on mortar and gravity to hold everything together... yeah I'm that guy
that overbuilds everything.
replace "roosters" with "cox" to reply.
On May 21, 6:04 pm, email@example.com wrote:
Better rething "getting it at a reasonable price". Unless you are
hauling with a semi, 800 blocks will reqwuite multiple trips with
whatever you haul with. The fuel cost will add up in a hurry. I had
my blocks used for the same purpose deliverred from 54 miles away all
in one trip and dropped right at the excavation.
IIRC the delivery charge was $1.00/mile (one way).
Why make your own mortar? You won't save much buy adding your own
sand (be sure it is "mason's sand).
The convenience alone is worth something. By the time you have laid a
couple hundred block you will kill for any way to save time and work.
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