Apr 20

Composite Rate Build Up for Upper Floor Slabs (Structural Frame) – Approximate Quantities in Elemental Estimate Layout

Composite Rate - Upper Floor Slabs

 

Composite Rate Build Up – Upper Floor Concrete Slabs

The Elemental Estimate layout and grouping of items will be used in this example. When building up composite rates for Approximate Quantities, you have to follow some basic principles. We are going to illustrate a composite rate build-up for Upper Floor Concrete Slabs:

200m Thick solid reinforced concrete slabs for upper floor 25MPa, steel reinforcement 120kg/m3, rough formwork to soffits, striking off and floating the top surface, including plaster and paint to soffits. Ceramic floor tiles fixed with adhesive on 25mm screed.

Step 1

First, you have to determine the Group unit of measurement. When you are measuring Upper Floor Concrete Slabs in Elemental or Approximate Quantities estimating, the group unit of measurement is the square metre (m2).

Step 2

The second step is listing all associated Bill items that can be mapped to Upper Floor Slabs by area. These are:

  • Reinforced concrete slab  – (m3) Rate – R1500
  • Steel reinforcement to slabs – (Tonne) Rate – R10,000.00
  • Formwork to soffits – (m2) Rate – R175
  • Striking off and floating top surface – (m2) Rate – R10
  • Plaster to concrete soffits – (m2) Rate – R30
  • Paint on plastered soffits – (m2) Rate – R30
  • Ceramic floor tiles – (m2) Rate – R250
  • Screeds – (m2) Rate – R30

Step 3

Since your Group unit is the square metre (m2), you should convert the Bill item rates to Cost per Square Metre.

Rate Build Up

GROUP – SLABS

Rate – Cost Per Square Metre (m2)  Rands
1m2 of Concrete slabs:    
200 x 1000 x 1000
0.2 x 1 x 1 = 0.2m3
0.2m3 x R1500 = R300 300
1m2 of Steel reinforcement:    
Slabs reinforcement density value = 120kg/m3
200 x 1000 x 1000
0.2 x 1 x 1 = 0.2m3
0.2m3 x 120 =24kg = 0.024 tonnes    
0.024 ton x R10,000 = R240 240
1m2 of Formwork to soffits:
1m2 = R175 175
1m2 Striking off and floating:    
1m2 = R10 10 725
1m2 Plaster to soffits:
1m2 = R30 30
1m2 Paint to soffits:
1m2 = R30 30 60
1m2 Ceramic floor tiles:
1m2 = R250 250
1m2 Screeds:
1m2 = R30 30 280
Composite Rate – SLABS 1065  

 

The composite rate for UPPER FLOOR SLABS is R1065 per square metre.

Elemental Layout and Grouping

Items which go into the element STRUCTURAL FRAME and component Slabs are stated in the description:

 
 

 

Unit Quantity Unit Rate Cost/m2 Subtotal Cost
STRUCTURAL FRAME

 

Slabs:

 

200mm Solid reinforced concrete slab, steel reinforcement 120kg/m3, formwork to soffits, striking off and floating top surface.

 

M2 725
Subtotal STRUCTURAL FRAME

 

Items which go into the element FLOOR FINISHES and component Applied Floor Finishes are stated in the description:

 
 

 

Unit Quantity Unit Rate Cost/m2 Subtotal Cost
FLOOR FINISHES

 

Applied Floor Finishes:

 

Allow a PC Sum of R150/m2 for Ceramic floor tiles fixed with adhesive on/and including 25mm screed. M2 280
Subtotal FLOOR FINISHES

 

Items which go into the element CEILINGS AND SOFFITS and component Slab Soffit Finishes are stated in the description:

 
 

 

Unit Quantity Unit Rate Cost/m2 Subtotal Cost
CEILINGS AND SOFFITS

 

Slab Soffit Finishes:

 

One coat cement plaster on concrete soffits and two coats Polvin Super Acrylic PVA paint plus undercoat, including preparing surfaces. M2 60
Subtotal CEILINGS AND SOFFITS