Concrete Foundations for Retaining Walls (cont.) Includes hand excavation in normal soil, backfilling, board or plywood forming as noted, grade 60 reinforcing steel and 3,000 P.S.I. concrete poured from the chute. Concrete waste when poured against earth is assumed to be 1" of concrete at the bottom of the footing and 2" along the walls. Concrete waste when poured against forms is assumed to be 1" at the bottom of the pad. When forms are used, estimate that excavation will be required 18" beyond the forms.
Hand excavated, poured against forms
    Excavation CL@.882 LF — 35.70 35.70
    Formwork M2@.337 LF 1.88 14.90 16.78
    Reinforcing steel RB@.108 LF 6.02 6.92 12.94
    Concrete CL@.089 LF 18.20 3.60 21.80
36" wide x 16" deep with 6 No. 5 bars, 3' deep, No. 4 transverse bars at 2' O.C.
  Hand excavated, poured against earth
    Excavation CL@.624 LF — 25.20 25.20
    Reinforcing steel RB@.108 LF 6.02 6.92 12.94
    Concrete CL@.096 LF 19.20 3.88 23.08
  Hand excavated, poured against forms
    Excavation CL@1.35 LF — 54.60 54.60
    Formwork M2@.337 LF 1.88 14.90 16.78
    Reinforcing steel RB@.108 LF 6.02 6.92 12.94
    Concrete CL@.089 LF 18.20 3.60 21.80
Concrete Block Wall Assemblies Typical costs for standard natural gray medium weight masonry block walls including blocks, mortar, typical reinforcing and normal waste. Foundations are not included. For more detailed coverage of concrete block masonry, see National Concrete & Masonry Estimator, http://CraftsmanSiteLicense.com
Walls constructed with 8" x 16" blocks laid in running bond
      4" thick wall M1@.090 SF 2.43 4.22 6.65
      6" thick wall M1@.100 SF 2.99 4.68 7.67
      8" thick wall M1@.120 SF 3.55 5.62 9.17
  12" thick wall M1@.150 SF 5.13 7.03 12.16
Additional costs for concrete block wall assemblies
  Using C476 grout, pumped — CY 162.00 — 162.00
  Material pumped in place and rodded, all cores filled.
      4" thick wall, (4.98 SF per CF) M1@.020 SF 1.20 .94 2.14
      6" thick wall, (4.56 SF per CF) M1@.022 SF 1.31 1.03 2.34
      8" thick wall, (3.79 SF per CF) M1@.024 SF 1.58 1.12 2.70
  10" thick wall, (3.08 SF per CF) M1@.031 SF 1.94 1.45 3.39
  12" thick wall, (2.46 SF per CF) M1@.040 SF 2.43 1.87 4.30
Add for grouting cores at 16" intervals, material pumped in place and rodded.
      4" thick wall, (8.42 SF per CF) M1@.011 SF .71 .52 1.23
      6" thick wall, (7.73 SF per CF) M1@.012 SF .77 .56 1.33
      8" thick wall, (6.53 SF per CF) M1@.014 SF .92 .66 1.58
  10" thick wall, (5.19 SF per CF) M1@.019 SF 1.15 .89 2.04
  12" thick wall, (4.21 SF per CF) M1@.023 SF 1.42 1.08 2.50
Add for grouting cores at 24" intervals, material pumped in place and rodded.
      4" thick wall, (10.24 SF per CF) M1@.008 SF .58 .37 .95
      6" thick wall, (9.02 SF per CF) M1@.009 SF .66 .42 1.08
      8" thick wall, (8.61 SF per CF) M1@.011 SF .70 .52 1.22
  10" thick wall, (6.76 SF per CF) M1@.014 SF .89 .66 1.55
  12" thick wall, (5.57 SF per CF) M1@.017 SF 1.08 .80 1.88
Add for grouting cores at 32" intervals, material pumped in place and rodded.
      4" thick wall, (11.66 SF per CF) M1@.007 SF .51 .33 .84
      6" thick wall, (10.24 SF per CF) M1@.008 SF .58 .37 .95
      8" thick wall, (9.97 SF per CF) M1@.010 SF .60 .47 1.07
  10" thick wall, (8.06 SF per CF) M1@.013 SF .74 .61 1.35
  12" thick wall, (6.65 SF per CF) M1@.014 SF .90 .66 1.56

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