# Composite Rate Build Up for Internal Walls Superstructure – Approximate Quantities in Elemental Estimate Layout

Composite Rate Build Up – Internal Walls Superstructure

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 Internal Walls:

Superstructure 115mm internal one brickwall 2900mm high, 150mm wide reinforcement every third course, including one coat cement plaster on smooth plastered walls both sides, one coat plaster primer and two coats Plascon Wall paint on both sides.

Step 1

First, you have to determine the Group unit of measurement. When you are measuring the internal walls (superstructure) 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 Internal Walls by area. These are:

• 115mm one brickwall  – (m2) Rate – R131
• 75mm wide brick reinforcement – (m) Rate – R2.50
• One coat cement plaster –  (m2) Rate – R30
• Painting (undercoat and overcoat) – (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 – INTERNAL DIVISIONS (SUPERSTRUCTURE) Rate – Cost Per Square Metre (m2)  Rands Approximate Elemental 1m2 of One brickwalls: 1m2 = R131 131 131 1m2 of Brick reinforcement: 1 course = 86mm including mortar joint 3 courses = 86 x 3 = 258mm 1000mm Wall height has : 1000/258 = 3.88 Layers ,which is approximately 3.00 Layers. Therefore 1m2 of brickwall has 3 Layers of brickforce. 3 Layers x 1m = 3m of reinforcement. 3m x R2.50 = R7.50 7.50 7.50 138.50 1m2 Cement plaster: 1000 x 1000 x 2 sides 1 x 1 x 2 = 2.00m2 2.00m2 x R30 = R60 60 30 1m2 Painting on plaster: 1000 x 1000 x 2 sides 1 x 1 x 2 = 2.00m2 2.00m2 x R30 = R60 60 30 60 Composite Rate – INTERNAL DIVISIONS 258.50

The composite rate for INTERNAL DIVISIONS (Superstructure Half Brickwalls) is R258.50 per square metre.

Elemental Layout and Grouping

Items which go into the element INTERNAL DIVISIONS and components Brick & Block Walls are stated in the description:

 Unit Quantity Unit Rate Cost/m2 Subtotal Cost INTERNAL DIVISIONS Brick and Block Walls: 115mm Half brickwall in superstructure (No openings), including 75mm reinforcement, and sundries. M2 138.50 Subtotal INTERNAL DIVISIONS

Items which go into the element INTERNAL WALL FINISHES and component Finishes are stated in the description:

 Unit Quantity Unit Rate Cost/m2 Subtotal Cost INTERNAL WALL FINISHES Finishes: One coat cement plaster on smooth plastered walls , PLUS one coat plaster primer and two coats Plascon Wall paint on external side. M2 60 Subtotal INTERNAL FINISHES