Quantity Take Off

Dr. Ayman A. Abu Hammad

Applied Science University

Topical Overview

• Chapter 1: Site Preparation• Chapter 2: Soil and Site Exploration• Chapter 3: Excavation• Chapter 4: Foundations Work• Chapter 5: Wood Formwork• Chapter 6: Steel Rebar• Chapter 7: Concrete• Chapter 8: Building structures• Chapter 9: Walls Construction• Chapter 10: Brick Works• Chapter 11: Masonry (Stone) • Chapter 12: Stair Wells

Finishing

Civil Works

Floor X

Planning:ScheduleProject teamSubcontractorsSuppliersSubmittalsworkforceSite electricity, access roads, phone line, water, heatCars

Mobilization:Site offices

Off. furnitureComputer, phone,

Workers residenceCement-agg.-rebar

Sto.Tools & equip.Security fence

Notice toproceed

Letter of intent

Foundations center lines

Excavation:1- Bulk Exc.2- Trimming

Foundations rebar fabrication

Blinding forms- cast

RC foundations forms- rebar

Foundations RC cast

Found. Wall forms- rebar

Found. wall cast

Compacted backfill

Floor on grade: rebar-

cast

Columns forms- rebar

Slab # 1 forms- rebar

Masonry

Slab # 1 cast Cast column & walls

Side walks

2- Weeks

Retaining Walls, fence

RC walls: forms-rebar

cast

Dismantle slab 1 forms

2-3-4…

Partition walls- block

work

E&M rough

Plaster

Tile

Doors-wind.

Paint

Rebar Take-off Rules• Steel diameters are:

– 8, 10, 12, 14, 16, 18mm….• Rebar Standard Lengths are:

– 4, 5, 6, 7, 12m.• Overlap standard distance is= 40*max Diameter for tension, 50*max Diameter for

compression.• Cover distance = 0.005m in foundations only and 0.025m otherwise.• Stirrup key is 0.1 *2= 0.2m• Rebar order format is as follows:

– Calculated Number Ø Standard Diameter/ Standard Length• Rebar volume is negligible in concrete quantity take-off.• AGGREGATE REBAR DATA FOR SIMILAR DIAMETERS AND LENGTHS ONLY!• FOR TONNAGE ESTIMATION MULTIPLY THE NUMBER BY THE LENGTH BY THE

UNIT WEIGHT OF BAR.• SHOULD TRANSLATE TAKE-OFF NUMBERS ON THE A-CADS.• Rebar Steps:

– Foundations: Strip, Isolated, Tie beams, FW– Floors, Columns, Walls, Retaining Walls, lintels– Slabs: P Beams, S Beams, Double Rib, Wall Beams, Ribs

3.5m

0.35m 7 D14mm/1m

Wall height=3m

5D16mm/1m

4 D12mm/1m

5 D14mm/1m

0.4m0.25m0.4m 0.25m4.8m

3.5mx4.5mx3m interior dim. Reservoir

• Foundation:– Stirrups: – [(4.8-0.05)*2]+[(0.35-0.05)*2]+0.2= 10.3m– Res. Length=4.5+0.65+0.65=5.8m– [5.8*5]+1= 29 +1=30 stirrup– 30D16/5m+30D16/6m– Longitudinal:

• Top bars= 4.8*7= 34 bar, length= 4.5+0.65+0.65=5.8m 6m• 68D14/6m

• Walls:– Vertical:

• length= 2.95m+0.35+0.20= 3.5m• Wall perimeter={2*(3.5+[0.25 C-C])}+{2*(4.5+[0.25C-C])}= 17m• Number of longitudinal bars= 17m*8bars per meter= 136 bar• 136D12/7m

– Longitudinal:• Short wall length= 3.5+(0.25*2)= 4m• Long wall length= 4.5+(0.25*2)= 5m• Number of longitudinal bars= 3m*10*2= 60• 120D14/4m• 120D14/5m

6m 5m

Overlap=40*max diam.= 0.64m

0.64

Concrete for Water ReservoirConcrete of Foundations L W H volume

Water reservoir

Blinding 5.0 6.0 0.1 3.0

RC 4.8 5.8 0.35 9.7

Walls 17.0 0.3 3.0 12.8

Rebar of foundation

w ater reserv LengthCount

foundation stirrups 10.3 6m 29.0 29Q16/6

5m 29.0 29Q16/5

foundation longitudinal12.3 6m 34.0 34Q14/6

7m 34.0 34Q14/7

Walls vertical rebar 17.00 3.65 136 136Q12/4 68Q12/7

Wall longitudinal rebar 4m 60 60Q14/4

5m 60 60Q14/5

Isolated Foundation 2.5m*3m*0.45m &

Column0.25m*0.6m. FWH=1.3m• Stirrups:

– (2*[(2.5-0.05)+(0.45-0.05)])+0.2= 5.9m6m

– Number of stirrups= 3m*5stirrups per meter= 15+1=16

– 16D16/6m• Longitudinal:

– (2*[(3.00-0.05)+(0.45-0.05)*2])+0.2= 6.9m7m

– Number of stirrups= 2.5m*7stirrups per meter= 18

– 17D14/7m• Column C1:

– Column Dowels: length=1.3+0.45+0.3+(overlap=40*16mm=0.65m)= 2.70m 3m8D16mm/3m 4D16mm/6m

– C1 above FL= 3.12(12 stones height)+0.3(slab)+0.64(overlap)= 4m 8D16/4m

0.45m 7 D14mm/1m

Wall height=1.3m5D16mm/1m

8D16mm

7D8mm/1m

1.125m 0.25m2.5m

1.125m

0.65 overlap

Civil Drawings (Foundations Drawings)

1

A

Civil Drawings (Foundations Drawings)

1

A

f1c1f1c1TB

TB TB

TBTB

TB

Civil Drawings (Foundations Drawings) 1

A

f1c1f1c1TB

TB TB

TBTB

TB

S1-1

S1-1 S1-1

S1-1S2-2

S2-2

S2-2

S2-2

S2-2

S3-3

S3-3

TB TB

4.00

9.50

13m 3.7

5m

4.6

3

9.56

63

57

5

5

7 7 5

3

3.5

3.5

44

Strip Footings

1.4

0.50 10*12mm5*14mm/1m

0.10

S1-1 (Stair Case)

0.100.10

0.2

1.6

0.60

0.10

S2-2 (Stone)

0.100.10

0.3

6*16mm/1m

12*14mm

5Q12/1m0.40

1m

0.50 6*12mm

5*12mm/1m

0.10

S3-3 (Balcony)

0.100.10

0.2

Strip foundations Rebar S1-S1

• S1-S1: 2 strips /6m& 2 strips/ 3m=3 strips length 6m– Stirrup length: [(1.4 -0.05)*2+(0.5-0.05)*2] +

0.2= 3.80= 4.00m– Stirrup count (compute length of foundation

center to center): [(6m-1.4)*2+ (3-1.4)*2]=12m

Count= 12*5 stirrups/m= 60

60Q12/4m– Longitudinal rebar: 3*10 Q12/6= 30Q12/6m

S2-S2• Longitudinal Rebar:

– 1 strip of length 4m• 2Q12/4• 12Q14/4

– 3 strips of length = 5m• 2*3stripsQ12/5= 6Q12/5• 12*3stripsQ14/5= 36Q14/5

– 4 strips of length 7m• 2*4Q12/7= 8Q12/7• 12*4Q14/7= 48Q14/7

• Stirrups:1) [(1.6-0.05)*2+(0.6-0.05)*2]+0.2= 5m2) [(1-0.05)*2+(0.3-0.05)*2)]+0.2= 2.6= 3– S1-S1 length Center to center= 38m

• 1) 38*6Q16/5= 228Q16/5m• 2) 38*5Q12/3= 190Q12/3= 95Q12/6

1.6

0.60

0.10

S2-2 (Stone)

0.100.10

0.3

6*16mm/1m

12*14mm

5Q12/1m0.40

Square Isolated Footings

2.6m

0.60

0.10

F1

0.100.10

0.3

6*16mm/1m two way

0.60

0.30

5*12mm/1m

6*12mm

Tie Beam TB

0.30

5*8mm/1m

6*16mm

C10.60

0.20

5*8mm/1m

6*14mm

CW10.50

3.2m1.3m

Concrete of Foundations L W H volumeWater reservoir Subtotal

Blinding 5 6 0.1 3RC 4.8 5.8 0.35 9.7Walls 17 0.3 3 12.8

Isolated F1 blinding 3.4 2.8 0.1 0.952RC 2.6 3.2 0.6 4.992FW 0.3 0.6 1.3 0.234

Strip blinding 1-1 12.4 1.6 0.1 1.984blinding 2-2 39.3 1.8 0.1 7.074blinding 3-3 7.7 1.2 0.1 0.924

S1-S1 12.4 1.4 0.5 8.68S2-S2 39.3 1.6 0.6 37.728S3-S3 7.7 1 0.5 3.85FW 59.4 0.3 1.3 23.166

TB blinding 15.4 0.5 0.1 0.77TB 15.4 0.3 0.6 2.772

Columns 2 0.3 0.6 3.12 1.1232Slab Volumerib block count1 block volumeblock volumeConcrete volume

Slab 39 273 0.01848 5.04504 33.95496Blinding 15 14.704RC 25 137.877

Civil Drawings (Roof Drawings) 4

B1 B1 B1 B1

B2

B2

B2

B3 B3

SBSB

SB

SB

SB

SB

SB

SB

SB SB

0.2014-18-24

40

SB

SBB2

2*12

/3m

2*10

2*10

2*10

DRDR

CR

B110*16/42*18/77*16/54*14/12

6*16/6B2

12*16/48*16/78*14/58*14/6

B38*18/84*14/63*14/6

3*18/3.5m 5*16/4m5*16 8*16 4*163*14 6*16 4*14

3m 5m 5.5m 2.5m

5*16/2.5m4*16

1.00m0.3

4*145*16

2*8/20cm

B1 (1:15)B1 (1:100)

Roof Details

4*16

4*14

5 .m 4m

6*16/4m4*16

1.00m

0.34*14

6*162*8/20cm

B2 (1:15)B2 (1:100)

4*14

5 .m 2.5m

8*18/8

1.00m

0.34*14

6*162*8/20cm

B3 (1:15)B3 (1:100)

6*14

0.30m0.3 6*16

*8/20cm

SB (1:15)

0.30m0.3 4*16

*8/20cm

DR&CR (1:15)

B110*16/42*18/77*16/54*14/12

6*16/6B2

12*16/48*16/78*14/58*14/6

B38*18/84*14/63*14/6

Slab Rebar

Upper5Q16/3 5Q16/6 4Q14/3 2Q14/6 6Q14/63Q18/2.5 2Q18/5 4Q14/6 4Q14/6 6Q16/68Q16/3.5 7Q16/7 6Q16/6 6Q16/6 2Q14/75Q16/3.5 3Q14/6 3Q14/3.5 2Q14/74Q16/3 2Q16/55Q14/34Q16/2.5

Lower

5Q16 8Q16

3Q146Q16 4Q14

3m 5 5.5m 2.5m

B1 (1:100)

2.5+0.1-0.9+0.64=2.35==2.55.5-1.85-1.9+0.64+0.64=35-1.5-1.5+0.64+0.64=3.3==3.5

0.30.30.80.70.3 2.5+0.1+.15=2.75==3

5.5+0.15+0.4=6

4Q14

5+0.4+0.35=5.75==63+0.1+0.35=3.45==3.5

3.7 4.35 2.9

3.00

1.1

5.0

3.5 2.52.5

Masonry Types:

• Zawyah: 1 Lm per piece• Silah: Araqa & Kalb: 1 Lm per piece• Dustour: 2 Lm per piece• Marabee’: 4 Lm per piece• Roukh: 1 Lm per piece• Arch: 3 Lm per piece• Balcony: each 1 Lm is taken as 2 Lm• Burtash: each 1 Lm is taken as 4 Lm

1.00 1.00 1.00 1.001.001.001.002.00 0.50

Masonry Take off

• Regular Masonry Take Off:– 4*(9.5-[1+4*0.25])= 30 LM– 10 (9.5-[5+10*0.25]= 20 LM– 2(9.5-[5+2*0.25]= 8 LM– 11(9.5-[2*0.25]= 99 LM

• Masonry Pieces Take Off:– Lintels (Burtash)= 2*(2.2) + 6*(1.20) = 4.4+7.2= 11.60

LM– Corner Stones= 27*2= 54– Opening corner stone= (10*7)+18= 88

Quantity Takeoff: Steel Estimating

• Steel bar standard diameters: 8mm, 10mm, 12mm, 14, 16, 18, 20, 32

• Steel bar standard lengths: 4, 5, 6, 7, 12• Steel overlapping follow rule 40 * Q

– If you have two bars of 10mm and 16mm, find the overlap distance?

– Select the higher diameter and multiply with 40= 16*40=640=64cm

• Distinguish between different types of steel

Working Example: Bathroom Quantity & Pricing:

Given information:• 3.6*2*3• Window: 0.7*1.00• Door: 0.8*2.1• Bath tub: 0.7*

• Ceramic:– Ceramic Floor: 2.9*2= 6m2

– walls: 11.2*3= 33.6 (33.6-[0.7+(0.8*2.1)])= 31.2 +2.7*0.15= 0.405 31.2+0.405= 31.6 Plaster quantity– Ceramic walls quantity= 31.6-0.7= 30.9m2

• Ceramic labor cost– 12KD for blinding= 12KD– 20KD*3days= 60KD– Joint filling: 1*12KD skilled rate= 12KD

• Ceramic material cost= 3KD/m2 *37m2= 111KD• Total Cost= 111+12+60+12= 195KD• Plaster:= 31.6m2

• Plaster material (fine aggregate) cost= 31.6*0.02*1.1= 0.7m2 *2KD= 1.4KD• Plaster cement cost (1:3 means 10 cement bags per m3)= 7bags* 1.350= 9.450• Labor cost:2days*20KD=40KD• Total cost= 1.4+9.5+ 40= 51KD•