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Simple Guide To Residential Construction Estimate

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MAINPAGE / DISCLAIMER - CONCRETE  -  MASONRY  -  STEEL REINFORCEMENT  -  FORMWORKS  & SCAFFOLDINGS  -  FINISHES 
DOORS & WINDOWS  -  ROOF FRAMING & ROOFING  -  CEILING - ELECTRICAL  -  SANITARY / PLUMBING

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Sanitary/Plumbing Estimation

Septic Tank & Catch Basin

EstimatingSanitary/Plumbing : SANITARY PIPE LINES - WATER SUPPLY LINE - SEPTIC TANK & CATCH BASIN

ITEM 1. Estimating Septic Tank & Catch Basin

 

Requirements:

Class  “B” Concreting and Masonry Works

 

Data based on Plan:

 4” CHB

 Watertight Plaster Finish  (use Class “A” mixture )

10 mm RSB @ .40 o.c. b.w for masonry

10 mm RSB @ .20 o.c. b.w. for concrete slab

0.10 thickness of concrete slab

3.00 m length

1.50 m width

1.80 m height

 

 

 

 

 

 

 

 

 

 


 

Computation : For SEPTIC TANK

Table 1.

CONCRETE PROPORTION

 

 

CLASS

 

MIXTURE

 

CEMENT

40kg/bag

 

SAND

cu.m

 

GRAVEL

cu.m

 Cement : Sand: Gravel

 

AA

1 : 1 ½ : 3

 

12.0

 

0.50

 

1.0

 

A

1   :  2  : 4

 

9.0

 

0.50

 

1.0

 

B

1 : 2 ½ : 5

 

7.50

 

0.50

 

1.0

 

C

1   :  3  : 5

 

6.0

 

0.50

 

1.0

 

Concrete Slab:

1.      For Lower Flooring:

    Compute the Volume: L x W x T

    3.00 x 1.50 x 0.10

    =    0 .45 cum x 1.5 ( for the volume of the slope)

    =    0.675 cum

2.      For Upper Flooring:

    Compute the Volume: L x W x T

     3.00 x 1.50 x 0.10

    =    0 .45 cum

 

 

 

Total:      0.675 + 0.45            =1.125 cum

Cement:   1.125 x 7.5 (Class B) = 8.4375 bags

Sand:       1.125 x 0.5             = .5625 cum

Gravel:     1.125 x 1.0             = 1.125 cum   

 

 Table 2.2 

CEMENT AND SAND FOR CHB MORTAR PER SQUARE METER

 

SIZE OF CHB

CEMENT 40 kg/bag

IN CLASS MIXTURE

Cement : Sand

 

SAND

cu.m.

B

C

D

4”

(.10X.20X.40)

 0.525

 0.394

 0.328

 0.04375

6”

(.15X.20X.40

 1.013

 0.759

 0.633

 0.08438

 

Masonry Works

3.      Compute the Perimeter: (L + W)  x 2

    =    (3.00 + 1.50) x 2     

    =    9.00 m

4.      Compute the Area: P x H

    =    9.00 x 1.80 m          

    =    16.20 sqm  

 

Table 2.1  

CEMENT AND SAND FOR PLASTER MIXTURE PER CUBIC METER

 

 

CLASS

 MIXTURE

 

CEMENT

40kg/bag

 

SAND

cu.m.

 Cement : Sand

 

A

 

1 : 2

 

18.0

 

1.0

 

B

 

1 : 3

 

12.0

 

1.0

 

C

 

1 : 4

 

9.0

 

1.0

 

D

 

1 : 5

 

7.5

 

1.0

 

5.  Compute the qty of 4” CHB:

     =    16.20sqm x 13pcs/sqm       

     =    210.60 pcs

6. Compute the mortar for CHB laying (Class “B”):

     Area: 16.20 sqm

Cement:   16.20 x  0.525          = 8.505 bags

Sand:       16.20 x 0.04375       = 0.708 cum 

7. Compute the mortar for Inside Plastering:

Area: 16.20 sqm

Average thickness of plaster: .02 m

 

Volume: 16.20 x .002

         =     0.324 cum

 

TABLE 3.1

 LENGTH OF STEEL REINFORCEMENTS FOR CONCRETE HOLLOW BLOCKS

 

VERTICAL

REINFORCEMENT

HORIZONTAL

 REINFORCEMENT

Spacing

in cm

 

Length of bars at 6.00 m long Per Sqm

 

Spacing in Layers

Length of bars at 6.00 m long Per Sqm

 

0.40

 

 0.53

 2 (0.40)

0.60

 

0.60

 

 0.39

 3  (0.60)

0.39

0.80

 0.29

 4 (0.80)

 

0.32

 

 

Cement:   0.324 x 18.0   = 5.832 bags

Sand:       0.324 x  1.0   = 0.324 cum

 

Steel Reinforcements

8.  Compute the rebars.

    Area: 16.20

    10 mm RSB @ .40 o.c. b.w

For Vertical Rebars:

16.20 x 0.53   = 8.586 lgth

 

For Horizontal Rebars:

16.20 x 0.60   = 9.72 lgth

 

9.  Compute the Tie Wire:

Area: 16.20

10 mm RSB @ .40 o.c. b.w

16.20 x 0.17   = 2.754 kg # 16 G.I. TW

 

TABLE 3.2

QUANTITY OF #16 G.I. TIE WIRE @ 0.30 M CUT LENGTH KG PER SQM FOR CHB LAYING 

 

SPACING

KG/SQM

 

VERTICAL X HORIZONTAL

 

 

0.40 X 0.40

 

0.17

 

0.40 X 0.60

 

0.11

 

0.40 X 0.80

 

0.08

 

0.60 X 0.60

 

0.75

 

0.60 X 0.80

 

0.05

 

0.80 X 0.80

 

0.04

 

For Lower Flooring

Compute the rebars:

Lgth:   3.00 m         

Witdh: 1.50 m

10 mm RSB @ .20 o.c. b.w

Effective Lgth of a 6.00 m rebar: 5.50m

 

For Along the Length Rebars:

(3.00 / .20 x 1.50) / 5.50m  = 4 lgth

                                                           

For Along the Width Rebars:

(1.50 / .20 x 3.00) / 5.50m  = 4 lgth

 

10. Compute the Tie Wire thru intersection method:

Along the Length:     3.00 / .20      = 15

Along the Width:      1.50 / .20      = 7.5

Total intersections:   15 x 7.5        = 112.50 pcs

 

Note: There are approximately 53 pcs of tie wire at 0.30 m legth in 1 kg

 112.50 / 53    = 2.12 kg of #16 G.I. TW

 

For Upper Flooring

Compute the rebars:

Lgth:   3.00 m         

Witdh: 1.50 m

10 mm RSB @ .20 o.c. b.w

Effective Lgth of a 6.00 m rebar: 5.50m

 

For Along the Length Rebars:

(3.00 / .20 x 1.50) / 5.50m  = 4 lgth

                                                           

For Along the Width Rebars:

(1.50 / .20 x 3.00) / 5.50m  = 4 lgth

 

 

 

 

11. Compute the Tie Wire thru intersection method:

Along the Length:     3.00 / .20      = 15

Along the Width:      1.50 / .20      = 7.5

Total intersections:   15 x 7.5        = 112.50 pcs

 

Note: There are approximately 53 pcs of tie wire at 0.30 m legth in 1 kg

 112.50 / 53    = 2.12 kg of #16 G.I. TW

 

 


 

Computation : For CATCH BASIN

 

12.    Refer to Catch Basin Detail and the Plumbing Layout.
        We have 6 CB.       

        For this standard size of CB, the approximate materials for each CB are ( and based from the computation procedures above):

 

Cement:        1 bag x 6                = 6.00 bags

Sand:           0.15 cum x 6            = 0.90 cum

Gravel:          0.30 cum x 6            = 1.80 cum

10mm RSB:    2.40 m x 6 / 6.00m    = 2.40 lgth

#16 G.I. TW: 0.41 kg x 6               = 2.46 kg

4" CHB:         9 pcs x 6                 =  54 pcs

 

 

 

 

 

 

 


Summary:   

                    = 28.77 say, 29 bags

 

                   = 3.49 say 4.00 cum

 

                   = 2.925 say, 3.00 cum

 

                   = 36.71, say 37 lgth    

 

                   = 9.454, say 10 kg

                        = 210.60 + 54

                        = 264.60, say 265 pcs

 

EstimatingSanitary/Plumbing : SANITARY PIPE LINES - WATER SUPPLY LINE - SEPTIC TANK & CATCH BASIN