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Sidewalk Construction: Calculations, Dimensions, and Cost Breakdown

Learn how to plan, calculate, and build sidewalks around your house, including materials needed, area measurements, and cost estimation.

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Sidewalk Construction: Calculations, Dimensions, and Cost Breakdown

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  1. Sinking in Concrete Day 2 - Sidewalks

  2. Extra Info • Now you are ready to move on to the sidewalks. • There are two sidewalks in this job • From driveway to porch • From porch to back of house • What do you need to know? • How wide to make the sidewalks • Where the gardens will be

  3. Talk to the Owner • Mr. Johansen would like the sidewalk to be 4’ wide. • Mrs. Johansen would like a 2’ wide flower bed from the porch wrapping around the side of the house to meet up with the bathroom wall. • Add this to your house plan. (open house plan day 2 in word)

  4. What materials do you need? • Just like the driveway you will need: • Gravel (only A grade this time) • Concrete • Rebar • Wood

  5. What to calculate? • Volume of gravel and concrete for each. • Area of rebar for each. • Perimeter of each for framing wood.

  6. Sidewalk #1(driveway to porch) • This sidwalk curves and is approximatly ¼ of a circle. • Imagine this was a big cylinder!

  7. We will need to find the volume of just the outside edge of the bottom quarter. • To find our dimensions, we will need to find the area of the big circle and subtract the area of the small circle. Then we will divide by 4 to find ¼ of the circle. • What material requires us to find the area? • Rebar!

  8. To find the area of a circle: • We need to find the radius of the big circle and the small circle. • Look at the house plan! • The radius of the small circle is the same as the width of the dining room (18’) • The radius of the big circle is the width of the dining room plus the width of the sidewalk (4’) • 18’+4’ = 22’

  9. Calculate area • Remember this is for the whole circle, we just want ¼ of it so divide by 4! • 502.65/4 = 125.66 square feet

  10. Put the amount in the table!

  11. Gravel • To find the volume of a prism we multiply the area of the base by it’s height. • Since we now know the area, we can multiply by the thickness of the gravel 0.5’

  12. Add to table

  13. Concrete • The concrete is found the same way as the gravel but with a new thickness 0.42.

  14. Add to the table

  15. Calculate the wood • Now we need to find the perimeter to find the wood. • Remember that perimeter goes around the sidewalk. • Since the sidewalk is 4’ wide we have two ends at 4’ • 4+4 = 8

  16. What about the two sides? • The inside corner is ¼ of the circumfrence of the small circle. • The outside corner is ¼ of the circumfrence of the big circle. • Remember that C=2Лr • Recall we found the radius when we found the area: • Small circle – 18 • Big circle - 22

  17. Small Circle: C=2*3.14*18 113.04 ** don’t forget to divide by 4 113.04/4 = 28.26’ • Big Circle: C=2*3.14*22 138.16 ** don’t forget to divide by 4 138.16/4 = 34.54’ So the perimeter is 4+4+28.26+34.54 = 70.8’

  18. Add it to the chart

  19. Now try to do sidewalk #2(porch to back deck) • Remember there are no curves for sidewalk #2 • Remember to leave space for the flower beds!

  20. Rebar • This sidewalk can be broken into three rectangles: Front, side, back • Front: the width is the dining room, plus the garden plus the width of the sidewalk. • 11+2+4 = 17 by 4 • 17*4 = 68 square feet

  21. Side is length of the house 55’9” • Convert 9” to feet • 9/12 = .75 • So the side is 55.75 * 4 = 223 square feet • Back is the width of bedroom #2 plus the sidewalk • 11+4 = 15 • 15 * 4 = 60 square feet

  22. Total • Front + Side + Back • A = 68+223+60 • A=351 square feet

  23. Gravel • V=Abase*height • V=351 * 0.5 • V= 175.5 cubic feet

  24. Concrete • V=Abase * height • V= 351 * .42 • V= 147.42 cubic feet

  25. Plywood • Start at the front and add up all of the side lengths. • 4 + 17+55.75+4+15+4+11+55.75+13 • Remember to include the flowerbed and the width of the sidewalk, it is helpful to look at the plan! • =179.5’

  26. How much plywood? • Sidewalk #1 • Remember you get 8 strips of 8’ out of one sheet of plywood. • 70.8/8=8.85 • Sidewalk #2 • 179.5/8 = 22.44 strips • 8.85 + 22.44 = 31.29’ • 31.29/8 per sheet = 3.91 or 4 sheets

  27. Put it all on the same chart!

  28. Gravel Cost • Remember gravel is sold by the cubic yard • = 238.33 * 0.037 = 8.82 cubic yards • We will need 9 cubic yards

  29. Concrete Cost • Concrete is sold in cubic meters, convert to cubic yards first, then cubic meters. • 200.2 * 0.037 = 7.41 cubic yards • 7.41 * 1.82 = 13.49 cubic meters • We will need 14 cubic meters

  30. Rebar Cost • Rebar is sold 4 x 8 = 32 square feet • We need 476.66 square feet • 476.66/32 = 14.9 sheets • We will order 15

  31. Cost it out

  32. Total Cost • Grave (A-grade): $63.00 • Concrete: $2800 • Rebar: $216.75 • Wood: $148.00 • Total: $3227.75 + tax (multiply by 1.13) = $3647.36

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