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

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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