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Quantity Take Off

Quantity Take Off. Applied Science University. Dr. Ayman A. Abu Hammad. 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

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Quantity Take Off

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  1. Quantity Take Off Applied Science University Dr. Ayman A. Abu Hammad

  2. 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

  3. Letter of intent Foundations rebar fabrication Mobilization: Site offices Off. furniture Computer, phone, Workers residence Cement-agg.-rebar Sto. Tools & equip. Security fence Planning: Schedule Project team Subcontractors Suppliers Submittals workforce Site electricity, access roads, phone line, water, heat Cars Notice to proceed Civil Works RC foundations forms- rebar Foundations RC cast Foundations center lines Blinding forms- cast Excavation: 1- Bulk Exc. 2- Trimming Found. Wall forms- rebar 2-3-4… Found. wall cast Floor X Columns forms- rebar Compacted backfill Finishing Side walks Masonry Partition walls- block work Floor on grade: rebar- cast Dismantle slab 1 forms Retaining Walls, fence Slab # 1 forms- rebar Slab # 1 cast Cast column & walls 2- Weeks E&M rough RC walls: forms-rebar cast Plaster Tile Doors-wind. Paint

  4. 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

  5. 4 D12mm/1m Wall height=3m 5 D14mm/1m 5D16mm/1m 7 D14mm/1m 0.35m 0.4m 0.25m 3.5m 0.4m 0.25m 4.8m

  6. 3.5mx4.5mx3m interior dim. Reservoir Overlap=40*max diam.= 0.64m • 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 0.64

  7. Concrete for Water Reservoir

  8. 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= 5.9m6m • 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= 6.9m7m • 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 3m 8D16mm/3m 4D16mm/6m • C1 above FL= 3.12(12 stones height)+0.3(slab)+0.64(overlap)= 4m 8D16/4m 0.65 overlap 8D16mm 7D8mm/1m Wall height=1.3m 5D16mm/1m 7 D14mm/1m 0.45m 1.125m 0.25m 1.125m 2.5m

  9. Civil Drawings (Foundations Drawings) A 1

  10. Civil Drawings (Foundations Drawings) A 1 TB TB TB f1c1 f1c1 TB TB TB

  11. Civil Drawings (Foundations Drawings) A 9.5 6 S1-1 1 4.00 S1-1 S1-1 3 3 3 6 7 5 S2-2 S1-1 3.5 TB TB 4.6 5 TB S2-2 f1c1 f1c1 3.5 9.50 TB TB TB 4 5m 4 S2-2 TB S2-2 TB S3-3 5 S3-3 S2-2 7 7 5 13m 3.7

  12. Strip Footings 0.2 0.3 5Q12/1m 0.40 6*16mm/1m 5*14mm/1m 0.50 10*12mm 12*14mm 0.60 0.10 0.10 0.10 0.10 1.4 0.10 0.10 1.6 S1-1 (Stair Case) S2-2 (Stone) 0.2 5*12mm/1m 0.50 6*12mm 0.10 0.10 0.10 1m S3-3 (Balcony)

  13. 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

  14. 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= 5m 2) [(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 0.3 5Q12/1m 0.40 6*16mm/1m 12*14mm 0.60 0.10 0.10 0.10 1.6 S2-2 (Stone)

  15. Square Isolated Footings 0.3 1.3m 6*16mm/1m two way 5*8mm/1m 3.2m 6*14mm 0.20 0.60 0.50 0.10 CW1 0.10 2.6m 0.10 F1 5*12mm/1m 5*8mm/1m 0.60 6*12mm 6*16mm 0.30 0.60 0.30 C1 Tie Beam TB

  16. Civil Drawings (Roof Drawings) 4 B1 10*16/4 2*18/7 7*16/5 4*14/12 6*16/6 B2 12*16/4 8*16/7 8*14/5 8*14/6 B3 8*18/8 4*14/6 3*14/6 14-18-24 SB 0.20 40 SB SB SB SB SB B2 B2 CR 2*10 SB SB 2*12/3m 2*10 B1 B1 B1 B1 SB SB B2 B2 DR DR 2*10 B3 B3 SB SB

  17. 2*8/20cm 3*18/3.5m 5*16/4m 5*16/2.5m 4*16 5*16 5*16 8*16 4*16 4*14 3*14 6*16 4*14 0.3 3m 5m 5.5m 2.5m 1.00m B1 (1:15) B1 (1:100) *8/20cm 2*8/20cm 0.3 6*16 6*16/4m 4*16 6*16 4*16 B1 10*16/4 2*18/7 7*16/5 4*14/12 6*16/6 B2 12*16/4 8*16/7 8*14/5 8*14/6 B3 8*18/8 4*14/6 3*14/6 4*14 0.30m 4*14 0.3 SB (1:15) 5. m 4m 1.00m *8/20cm B2 (1:15) B2 (1:100) 0.3 4*16 0.30m 2*8/20cm DR&CR (1:15) 8*18/8 6*16 4*14 6*14 4*14 0.3 Roof Details 5. m 2.5m 1.00m B3 (1:15) B3 (1:100)

  18. Slab Rebar

  19. 3.5 3.00 2.5 2.5 5.0 2.9 3.7 4.35 1.1

  20. 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

  21. 1.00 2.00 1.00 1.00 1.00 1.00 1.00 1.00 0.50

  22. 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

  23. 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

  24. 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

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