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 |
