Apr 19

# Composite Rate Build Up for Ground Floor Construction – Approximate Quantities in Elemental Estimate Layout

Composite Rate Build up – Floor Construction

In this example, the Elemental Estimate layout and grouping of items will be used. There are principles that you have to follow when building up composite rates for Approximate Quantities. We are going to illustrate a composite rate build-up for Ground Floor Construction:

Topsoil excavation average depth 150mm, 100mm surface concrete bed (30MPa) on DPM, on 25mm thick sand blinding under floors, over 150mm hardcore filling on compacted ground including ant proofing and mesh wire reinforcement.

Step 1

First, you have to determine the Group unit of measurement. When you are measuring Ground Floor Construction 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 Floor Construction by area. These are:

• Topsoil excavation – (m2) Rate – 5.00
• Surface concrete bed – (m3) Rate – 1200
• Mesh wire reinforcement – (m2) Rate – 125.00
• DPM – (m2) Rate – 7.00
• Sand blinding under floors – (m2) Rate – 35.00
• Hardcore filling – (m3) Rate – 40
• Ground compaction – (m2) Rate – 5.00
• Ant proofing – (m2) Rate – 7.00
• Striking off and floating top surface – (m2) Rate – R10
• 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 – GROUND FLOOR CONSTRUCTION Rate – Cost Per Square Metre (m2)  Rands 1m2 of Topsoil excavation 1m2  = R5.00 5 1m2 of Surface Concrete Bed 100 x 1000 x 1000 0.10 x 1 x 1 = 0.10m3 0.10m3 x 1200 = R120 120 1m2 of Wire Reinforcement 1m2 = R125 125 1m2 of DPM 1m2 = R7.00 7 1m2 of Sand Blinding 1m2 = R35 35 1m2 of Hardcore Filling 150 x 1000 x 1000 0.15 x 1 x 1 = 0.15m3 0.15m3 x R40 = R6.00 6 1m2 of Ground Compaction 1m2 = R5.00 5 1m2 of Ant Proofing 1m2 = R7.00 7 1m2 Striking off and floating 1m2 = R10 10 320 1m2 Ceramic floor tiles 1m2 = R250 250 1m2 Screeds 1m2 = R30 30 280 Composite Rate – GROUND FLOOR CONSTRUCTION 600

The composite rate for GROUND FLOOR CONSTRUCTION is R600 per square metre.

Elemental Layout and Grouping

Items which go into the element GROUND FLOOR CONSTRUCTION and component Solid Floors are stated in the description:

 Unit Quantity Unit Rate Cost/m2 Subtotal Cost GROUND FLOOR CONSTRUCTION Solid Floors: 100mm Mass concrete surface bed on USB Green DPM on sand bed, over hardcore filling on prepared ground, including ant proofing and mesh wire reinforcement. M2 320 Subtotal GROUND FLOOR CONSTRUCTION M2

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 M2

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