CPCCBC4010: Apply structural principles to residential & commercial constructions Assessment Task 3

Assessment Task 3

Note: You are required to access and use AS1684 - 2021 Residential Timber Frame Construction to determine timber size, stress grade, bracing and tie down. (Use and reference to AS1684, is a requirement of this task.)

Specifications:

• The wind classification for this site will be N2.
• All sub – floor members & Lintels to be F17 Seasoned hardwood.
• Frame generally MGP12 – UNO (Unless noted Otherwise)
• Bearers - number 4 with 3 equal spacing`s to main building
• Sheet flooring to be 14mm F8 Plywood.
• Studs generally at 450mm centres notched MGP 12 - UNO
• Tie down at 900mm centres.
• Truss spacing at 600mm centres.

Roof battens MGP12 at 900 mm spacing max

Instructions

• Consider this case study is to be built in Roma Queensland. Assess compliance for the following against the NCC Vol 2 concerning the floor frame & flooring. The building is greater than 3m from all boundaries.
  • Total R-Value required
  • Fire safety compliance
  • Rising Damp i.e. Sub-floor Ventilation
• Describe the advantages of using “Shadow clad” plywood sheeting in lieu of weatherboard cladding to the external walls of the house. Make sure to cite AS1684.2 in your answer.
• Produce a tie-down schedule (include calculations for uplift force, etc.) for the first floor plan. Tie-Down detail requirements for the following tie-down points must be presented. Alternatively you may present as a series of labelled diagrams.
  • Bottom plate to joist
  • Stud to top plate
  • Truss to top plate.
• Produce a list of structural component member sizes for the supplied plans – CPCCBC4010_AT3_Plans
  • Roof battens.
  • Wall plates (top & bottom)
  • Wall studs (including noggings)
  • Window lintels
  • Floor joists
  • Floor bearers (You will need to set out the pad footing for the supporting columns)
• Identify the kN Resistance Force required for wind bracing in both directions for the project. Show all calculations regarding how you have determined the racking forces. *You do nothave to calculate the racking force on the sub-floor area.
• Describe the safety precautions you should be aware of during erection of the frame.
• Identify the cause and effect of a sagging lintel to the living room window on the external wall, i.e. you have ordered an MGP10 lintel instead of an F17.
• Discuss the remedial work required to rectify the identified structural failure in Q6 above. Provide dot points for the steps required.
• Discuss how you will plan and implement the erection of the roof frame. Include the following in your discussion:
  • Identify the type of roof i.e. gable, hip, skillion etc
  • For a truss roof
  • For a cut roof
• Discuss how you will plan and implement the erection of the roof cladding and ancillary items. Include the following in your discussion:
  • Roof sarking if required
  • Roof cladding
  • Service penetrations (pipes through the cladding)
  • Roof ventilators (Whirlybirds)
  • Skylights

Brief Summary of Assessment Requirements

Assessment Task 3 requires the student to demonstrate practical and theoretical knowledge of structural principles in residential construction, with mandatory use and referencing of AS1684 – 2021 Residential Timber-Framed Construction and compliance with NCC Volume 2.

The assessment is based on a case study residential building in Roma, Queensland (Wind Classification N2) and requires evaluation, calculations, and written discussion across multiple construction stages.

Key Assessment Requirements and Pointers

The student must:

• Apply AS1684.2 and NCC Vol 2 to determine:
  • Timber sizes, stress grades, bracing, and tie-down details
• Assess floor frame and flooring compliance, including:
  • Total R-value
  • Fire safety compliance
  • Rising damp and sub-floor ventilation
• Produce a tie-down schedule, including uplift force calculations for:
  • Bottom plate to joist
  • Stud to top plate
  • Truss to top plate
• Prepare a structural member size schedule for supplied plans, including:
  • Roof battens
  • Wall plates
  • Studs and noggings
  • Window lintels
  • Floor joists and bearers (with pad footing layout)
• Calculate wind bracing resistance (kN) in both directions and show racking force calculations
• Discuss:
  • Safety precautions during frame erection
  • Cause and effect of a sagging lintel due to incorrect stress grade
  • Remedial work required to fix structural failure
• Explain planning and implementation of:
  • Roof frame erection (truss and cut roof)
  • Roof cladding and ancillary items (sarking, penetrations, ventilators, skylights)
• Compare external wall cladding options and justify the use of Shadowclad plywood with reference to AS1684.2

Academic Mentor’s Step-by-Step Approach

The academic mentor guided the student through the assessment in a structured, sequential process, ensuring all compliance and learning outcomes were met.

Step 1: Understanding Codes and Site Conditions

The mentor began by explaining:

• The importance of AS1684 (mandatory reference)
• NCC Volume 2 requirements
• Site-specific conditions (Roma QLD, Wind Class N2, boundary setbacks)

This ensured the student understood the regulatory framework before calculations began.

Step 2: Reviewing Specifications and Materials

The mentor helped the student interpret provided specifications, including:

• Timber stress grades (F17, MGP12)
• Stud spacing, truss spacing, tie-down centres
• Flooring and roof batten requirements

Each specification was linked to the relevant AS1684 tables.

Step 3: Floor Frame and NCC Compliance Analysis

The student was guided to assess:

• Floor system compliance
• Required R-values
• Fire safety provisions
• Sub-floor ventilation for rising damp control

The mentor ensured NCC clauses were correctly referenced and explained in simple technical language.

Step 4: Structural Calculations and Schedules

The mentor supported the student in:

• Preparing the tie-down schedule
• Calculating uplift forces
• Identifying appropriate fixings
• Determining wind bracing resistance and racking forces

All calculations were explained step-by-step to reinforce understanding.

Step 5: Structural Member Selection

Using the supplied plans, the mentor guided the student in:

• Selecting compliant timber member sizes
• Justifying lintel, joist, bearer, and batten choices
• Setting out pad footings for floor bearers

AS1684 tables were referenced throughout.

Step 6: Defect Identification and Remedial Strategy

The student was taught how to:

• Identify the cause of lintel sag (incorrect stress grade)
• Explain structural consequences
• Propose practical remedial steps using dot-point construction sequencing

This linked theory to real-world site issues.

Step 7: Construction Planning and Safety

The mentor assisted with:

• Roof type identification (truss vs cut roof)
• Planning erection sequences
• Discussing safety precautions during framing
• Explaining roof cladding installation and ancillary components

This section focused on construction methodology and WHS awareness.

Final Outcome Achieved

Through structured mentoring, the student successfully delivered:

• A fully compliant structural assessment
• Correct application of AS1684 and NCC Vol 2
• Accurate calculations and schedules
• Clear technical explanations supported by standards
• Practical construction planning and defect analysis

Learning Objectives Covered

This assessment and mentoring process addressed the following learning objectives:

• Application of Australian Standards in residential construction
• Structural analysis and load calculation skills
• Regulatory compliance and documentation
• Problem identification and remedial planning
• Construction sequencing and safety awareness
• Professional technical communication

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