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Concrete Services-Traditional-
Stamping-Acid Staining-Concrete Etching
Concrete Services-Traditional-
Stamping-Acid Staining-Concrete Etching
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Stamping Concrete
How to figure the amount of concrete
1. Measure the length and the width of your forms, then multiply the length by the width to get your square footage. If the depth of your project is going to be 4" you will divide the product of the length times the width by 81.
For example if your length is 10' and your width is 20' you will multiply these two numbers, which will give you a product of 200' square feet. Then divide the 200, square feet by 81, which is 2.5 yards of concrete.
20'
20' x 10' = 200 square feet/ 200' sq.ft divided by 81 = 2.5 yards
One good way to make sure that you have a consistent 4" in depth within your forms is to insert a screw every 5' into one side of the forms, and with a string line make a loop in one end of the string. Hook the string line onto the first screw pull it across to the opposite form while pulling it tight, rest the string line on the top of the opposite form. Have another person take a tape measure and run it along the string line measuring from the ground (sub-grade) up to the string line, making sure that is consistently 4" in depth . Lastly, unhook the string line and place it around the next screw approximately 5' down from the first screw and repeat the process of pulling the string line across to the opposite form and have another person use a tape measure and they will walk along the string line making sure that it is 4" in depth. Repeat this process every 4' to 5' feet.
2. If your depth is going to be 6", follow the procedure stated above to get your square footage(length times width) but for 6" in depth you will divide the square footage by 54.
For example 10' by 20' will give you the product of 200' square foot, divide 200 by 54 and the amount of concrete needed will now be, 3.7 yards of concrete. At this point I would round 3.7 up to 4 total yards.
As a general rule when I order my concrete depending on the square footage that I am going to pour, I will always order an extra 1/2 yard or 1 yard, so I am sure that I will not run short. Running short can cause complications and also cost more if you happen to run short and have another concrete truck come back with a 1/2 yard or so of concrete. If your pour is going to be 5 yards or less I would order an extra 1/2 yard, 5 yards of concrete or more I would order an extra 1 yard of concrete.
3. To get measurements on "kidney" shaped or irregular shaped form work you will measure as follows. Break down the perimeter of the forms into circles and then outline the circles with squares. Once you have done this you will notice that in between the circle and the top of the square there will be a triangle on each side of the circle. If you place both triangles together you will notice this makes a square.
Step 1. Create your "kidney shape " perimeter.
Step 2. Break down your " kidney shaped " perimeter into circles.
Step 3. Outline your circles with squares.
A) As shown in the diagram, in between the outline of the square and the circle at the top, on each side there are triangle shapes
B) If you combine the two triangles together you will get a square
C) Now you will take each square separately and measure the length by the width to get the total sq.ft.
D) The next step is to subtract the square footage of the combined triangles that are now in a square shape.
E) As shown in the diagram the bottom triangles on the outside of each of the outlined squares, will fold into the center and cancel each other out
F) In short, you will not do anything to the bottom as far as getting any measurements
For example; lets say that our larger square is 20' by 20' if we measure length by the width it gives us a total of 400' sq.ft.. Now we will take the two triangles on the top of each side of the larger square and combine them together to make a square, and lets say that this square is 5' by 5', giving us a total of 25' sq.ft. Now we will subtract the total square footage of the triangles that we combined to make a square by the total square footage of the large square. So, we will take 400' sq.ft. and subtract 25' sq.ft. leaving us with the sum of 375' sq.ft.
Now lets say that the smaller square is 15' by15' giving us the product of 225' sq.ft.. Then we will combine the two triangles together on each side giving us a square shape. Lets say that it is 3' by 3' with the product being 9' sq.ft. Now we will subtract 9' sq.ft. from the total square foot of the smaller square which is 225' sq.ft. this leaves us with the sum of 216' sq.ft.
Now we will take the square footage from the larger square ( 375' sq.ft. ) and add to it the square footage from the smaller square (216' sq.ft. ) leaving us with a total square footage of 591' sq.ft.
Now that we have figured out that the total square footage is 591' sq.f./ if our slab were going to be 4" thick we would divide the total sq.ft. 591' by 81 giving us a total of 7.3 yards of concrete, at which point I would round that up to 8 yards of concrete.
1. Measure the length and the width of your forms, then multiply the length by the width to get your square footage. If the depth of your project is going to be 4" you will divide the product of the length times the width by 81.
For example if your length is 10' and your width is 20' you will multiply these two numbers, which will give you a product of 200' square feet. Then divide the 200, square feet by 81, which is 2.5 yards of concrete.
20'
| 10' |
One good way to make sure that you have a consistent 4" in depth within your forms is to insert a screw every 5' into one side of the forms, and with a string line make a loop in one end of the string. Hook the string line onto the first screw pull it across to the opposite form while pulling it tight, rest the string line on the top of the opposite form. Have another person take a tape measure and run it along the string line measuring from the ground (sub-grade) up to the string line, making sure that is consistently 4" in depth . Lastly, unhook the string line and place it around the next screw approximately 5' down from the first screw and repeat the process of pulling the string line across to the opposite form and have another person use a tape measure and they will walk along the string line making sure that it is 4" in depth. Repeat this process every 4' to 5' feet.
2. If your depth is going to be 6", follow the procedure stated above to get your square footage(length times width) but for 6" in depth you will divide the square footage by 54.
For example 10' by 20' will give you the product of 200' square foot, divide 200 by 54 and the amount of concrete needed will now be, 3.7 yards of concrete. At this point I would round 3.7 up to 4 total yards.
As a general rule when I order my concrete depending on the square footage that I am going to pour, I will always order an extra 1/2 yard or 1 yard, so I am sure that I will not run short. Running short can cause complications and also cost more if you happen to run short and have another concrete truck come back with a 1/2 yard or so of concrete. If your pour is going to be 5 yards or less I would order an extra 1/2 yard, 5 yards of concrete or more I would order an extra 1 yard of concrete.
3. To get measurements on "kidney" shaped or irregular shaped form work you will measure as follows. Break down the perimeter of the forms into circles and then outline the circles with squares. Once you have done this you will notice that in between the circle and the top of the square there will be a triangle on each side of the circle. If you place both triangles together you will notice this makes a square.
Step 1. Create your "kidney shape " perimeter.
Step 2. Break down your " kidney shaped " perimeter into circles.
Step 3. Outline your circles with squares.
A) As shown in the diagram, in between the outline of the square and the circle at the top, on each side there are triangle shapes
B) If you combine the two triangles together you will get a square
C) Now you will take each square separately and measure the length by the width to get the total sq.ft.
D) The next step is to subtract the square footage of the combined triangles that are now in a square shape.
E) As shown in the diagram the bottom triangles on the outside of each of the outlined squares, will fold into the center and cancel each other out
F) In short, you will not do anything to the bottom as far as getting any measurements
For example; lets say that our larger square is 20' by 20' if we measure length by the width it gives us a total of 400' sq.ft.. Now we will take the two triangles on the top of each side of the larger square and combine them together to make a square, and lets say that this square is 5' by 5', giving us a total of 25' sq.ft. Now we will subtract the total square footage of the triangles that we combined to make a square by the total square footage of the large square. So, we will take 400' sq.ft. and subtract 25' sq.ft. leaving us with the sum of 375' sq.ft.
Now lets say that the smaller square is 15' by15' giving us the product of 225' sq.ft.. Then we will combine the two triangles together on each side giving us a square shape. Lets say that it is 3' by 3' with the product being 9' sq.ft. Now we will subtract 9' sq.ft. from the total square foot of the smaller square which is 225' sq.ft. this leaves us with the sum of 216' sq.ft.
Now we will take the square footage from the larger square ( 375' sq.ft. ) and add to it the square footage from the smaller square (216' sq.ft. ) leaving us with a total square footage of 591' sq.ft.
Now that we have figured out that the total square footage is 591' sq.f./ if our slab were going to be 4" thick we would divide the total sq.ft. 591' by 81 giving us a total of 7.3 yards of concrete, at which point I would round that up to 8 yards of concrete.
How to calculate the amount of rebar
There are a few different ways to calculate the amount of rebar that you will need for your project. The one that I most often use is the quickest.
This equation is based on the price of rebar per linear foot times the total square footage.
For example, let's say the price for a 20' by 1/2" stick of rebar is $3.50 you would multiply the sq.ft by .20. Let's use a dimension of 10' x 10' this gives the product of 100, sq.ft.. So you would multiply 100' sq.ft by .20 and this gives a total of $20.00, then you would divide $20.00 by $3.50 and the sum of that is 5.7 pieces of rebar, in which case I would round up to 6 pieces of rebar.
For every dollar more that an individual stick of rebar cost you would add an additional .03 cents to get the amount of rebar needed. For example, if a stick of rebar cost $4.50 you would multiply the total sq.ft. by .23 cents. So lets do the math, 100 times .23 equals $23.00 then you will divide $23.00 by $4.50 this gives us the sum of 5.2 , in which case, I would round it up to 6 total pieces of rebar needed.
There are a few different ways to calculate the amount of rebar that you will need for your project. The one that I most often use is the quickest.
This equation is based on the price of rebar per linear foot times the total square footage.
For example, let's say the price for a 20' by 1/2" stick of rebar is $3.50 you would multiply the sq.ft by .20. Let's use a dimension of 10' x 10' this gives the product of 100, sq.ft.. So you would multiply 100' sq.ft by .20 and this gives a total of $20.00, then you would divide $20.00 by $3.50 and the sum of that is 5.7 pieces of rebar, in which case I would round up to 6 pieces of rebar.
For every dollar more that an individual stick of rebar cost you would add an additional .03 cents to get the amount of rebar needed. For example, if a stick of rebar cost $4.50 you would multiply the total sq.ft. by .23 cents. So lets do the math, 100 times .23 equals $23.00 then you will divide $23.00 by $4.50 this gives us the sum of 5.2 , in which case, I would round it up to 6 total pieces of rebar needed.
How to calculate the amount of gravel needed
What we are going to do is to convert yards to tons. Since the concrete is comprised of mostly gravel this makes it really easy to do.
For example, as mentioned above that if we were to calculate the amount of concrete needed for a thickness of 4" in depth we would take the total sq.ft. and divide it by 81, to get the amount of concrete needed which is 1.3 yards of concrete, which I would round up to 1.5 yards of concrete.
So lets convert yards into tons. What needs to be done is to figure out our square footage, Let's use 100' sq.ft. for an example, we know that it calls for 1.5 yards of concrete at 4" in depth. So what we will do is to get 1.5 tons of gravel. Since you generally won't need a 4" gravel bed you will most likely need no more than a 2" gravel bed. What you will do is to divide 4" by 2" which reduces the amount of gravel by half, so if 4" it calls for 1.5 tons of gravel, 2" of gravel will call for .75 tons of gravel. I would actually order 1 ton.
What we are going to do is to convert yards to tons. Since the concrete is comprised of mostly gravel this makes it really easy to do.
For example, as mentioned above that if we were to calculate the amount of concrete needed for a thickness of 4" in depth we would take the total sq.ft. and divide it by 81, to get the amount of concrete needed which is 1.3 yards of concrete, which I would round up to 1.5 yards of concrete.
So lets convert yards into tons. What needs to be done is to figure out our square footage, Let's use 100' sq.ft. for an example, we know that it calls for 1.5 yards of concrete at 4" in depth. So what we will do is to get 1.5 tons of gravel. Since you generally won't need a 4" gravel bed you will most likely need no more than a 2" gravel bed. What you will do is to divide 4" by 2" which reduces the amount of gravel by half, so if 4" it calls for 1.5 tons of gravel, 2" of gravel will call for .75 tons of gravel. I would actually order 1 ton.
