CPCCOM3001 Perform construction calculations to determine carpentry material requirements

This unit of competency specifies the skills and knowledge required to plan and perform calculations to determine material requirements for a construction project.

Completion of the general construction induction training program specified by the model Code of Practice for Construction Work is required for any person who is to carry out construction work. Achievement of CPCCWHS1001 Prepare to work safely in the construction industry meets this requirement.

Assessment for this unit comprises:

»  Knowledge test

»  Materials List.

A Materials List template, a Workings Sheet and an Assessor checklist are provided in this Workbook. Review these documents before you get started so you are clear on what you need to do. Speak to your trainer, assessor or workplace supervisor if you have questions.

Knowledge test

In this task, you will answer a range of questions relating to calculations and processes required to complete material lists. This is an open book test that can be completed in the classroom or set as a homework activity.

You will need to answer all questions correctly.

Materials list

For this task you must prepare a detailed Materials List for a house with at least six rooms, including a kitchen and bathroom.

Your assessor will provide you with access to a set of plans/drawings and specs for the house build. You will need to review these documents and associated Australian Standards, quality procedures, NCC requirements and manufacturer’s instructions, and create a Materials List. You will need to document required materials and calculate quantities for:

»  wall framing

»  wall linings

»  roof framing

»  sheets or units of roofing materials (as per the specs)

»  building wrap

»  linear external cladding

»  sheets of external cladding

»  flooring materials.

Using the Australian Standards, NCC and manufacturer’s instructions will give you details about specific information to help you work out quantities and make calculations based on quality requirements and specific layout requirements.

A Material List template has been provided for you to work with. Your assessor may also provide you with similar electronic version in a spreadsheet or document format.

You need to use the Materials List to calculate:

»  area of lining materials

»  total area of building wrap

»  total area of external cladding

»  total area of each type of roofing material

»  any materials that are measured by volume

»  the amount of wall framing materials

»  the amount of roof framing materials

»  the amount of flooring and lining material required (and dimensions of such)

»  length of linear flooring

»  length of linear lining material

»  the amount of sheets of external cladding material required (and dimensions of such)

»  length of linear external cladding material

»  the amount of sheets of roofing cladding material required (and dimensions of such).

You will also need to evidence of your workings and any adjustments you make to ensure accuracy. A Workings Sheet can be found in this workbook. Your Workings Sheet must be submitted with your completed Material List.

You must correctly and accurately complete all requirements of the task to be marked as satisfactory.

Review the requirements of the assessment checklist so you are familiar with what your assessor is expecting you to do as part of this task.

Tips for completing this task successfully

»  Double check (at least!) all your calculations.

»  Don’t forget to review manufacturer’s instructions – there may be specific requirements that need to be followed, so you may need to apply extra calculations.

»  Don’t forget to round up to nearest orderable quantities/lengths where applicable.

»  Don’t forget to account for materials wastage (10%).

The formula of rectangular prism volume: –

V = L*B*H

The formula of sphere volume: –

V = 4/3 π r³

The formula of triangular prism volume: –

V = ½ BHL

The formula of trapezium volume: –

Area of trapezium base= 1/2 *(A+B) * H * L

The formula of a cube volume: –

V = √3 × d3/9

The formula of cylinder volume: –

V = π r² h

The formula of a rectangle area: –

A = L * B

The formula of a square area: –

A = SIDE * SIDE

The formula of a circle area: –

A = π r²

The formula of a triangle area: –

A = ½ * BASE * HEIGHT

The formula of trapezium area: –

Area of trapezium base= 1/2 *(a+b) * h

The formula of a cube area: –

A = 6a2

The formula of a cylinder area: –

A = 2π r h + 2π r²

The method is M = MM value /1000

The method is MM = M value * 1000

A calculator is used for calculations such as addition, subtraction, multiplication, and division to calculate material prices, quantity, or measurements (Tan, et al., 2019). The limitation of a calculator is that it is not capable to calculate the mass value of large datasets.

A spreadsheet program (MS Excel) is used for checking balance inventory, calculating costs, and estimating project materials (Gonzalez-Platas, et al., 2016). The limitation of spreadsheet programs is that they cannot be used by anyone because they require some level of computer proficiency.

The in-the-head or pen-and-paper is useful for quick and simple calculations and can be used to estimate material quantities. The limitation of this is that it is prone to human errors, especially when dealing with large numbers or complex calculations.

Estimating software can be used to calculate the cost of materials and labor for construction. The limitation of estimating software is that it is quite expensive compared to other tools.

It is quite important in terms of providing clear instructions, maintaining standards and quality, accuracy, helpful in project closure, and providing clear, concise, and rich information about the project.

NCC may require consideration of material quantity and project design.

It may require consideration of relevant legislation and standards.

It may require consideration of any risks to workers or the public during construction (Sánchez, et al., 2017).

It may require consideration of the environmental impact of materials and ensuring compliance with relevant regulations.

It may require consideration of materials selected that are compatible with the manufacturer’s installation.

It may require consideration of workplace policies and procedures, such as using approved suppliers and purchasing methods.

Write down all the calculations you use. Double check all your calculations. Use pen (so your assessor can see any changes you make).