Work Section 24 - Doors Shutters and Hatches - NRM2 and Worked Example 1 (1)

Introduction to Measurement

  • Measurement is the process of quantifying what is depicted in architectural drawings.

  • Known as ‘taking off’ the quantities, which involves:

    • Extracting dimensions from drawings to determine the overall quantities.

    • Writing corresponding descriptions based on a provided specification.

  • The result is a quantified data set which can assist in costing and tendering processes.

Tendering Process

Compiling the Tender Document

  • Usually consists of a Bill of Quantities (BoQ) or Schedule of Works.

  • Stages of Tendering:

    1. Pre-Contract / Pre-Tender Phase:

      • Establish the project brief

      • Conduct feasibility studies

      • Set budget/cost limit and develop estimates

      • Prepare tender documents

    2. Tender Phase:

      • Finalize design and tendering documents

      • Analyze incoming tenders

      • Award contract

    3. Post-Contract Phase:

      • Control costs, manage variations and interim payments

      • Collect feedback from occupancy evaluation and facilities management.

Success in Measurement

  • Effective measurement practices:

    • Attend lectures and take comprehensive notes

    • Stay organized and systematic from the outset

    • Take time to review drawings and specifications thoroughly

    • Research terms and measurement standards as needed

  • Essential Knowledge Areas:

    • Understanding construction technology and information conventions

    • Familiarity with measurement standards

    • Grasp of the entire measurement process.

NRM2 and Measuring Work Sections

Composition of Bill of Quantities

  • The components of a BoQ under NRM2 include:

    • Form of tender and summary

    • Preliminaries and measured works

    • Non-measurable works and provisional sums

    • Contractor-designed works and associated risks

    • Credits for materials derived from works

Work Section 24: Doors, Shutters, and Hatches

  • Includes specifics such as:

    • Information on door types and construction details

    • Requirements for drawings, schedules, and measurements

    • Minimum information needed includes location, specifications for materials, and types of doors.

Detailed Measurement Items

  • The first column of the work section table identifies types of construction works to be measured, which are categorized as follows:

    1. Door sets - measured as a unit (nr)

    2. Individual doors, frames, linings, stops, etc.

    3. Special categories including ironmongery, glass treatments, and fire resistance specifications

Measurement Standards and Conventions

  • Reference the NRM2 for understanding:

    • Units of measurement and relevant variables

    • Definitions and notes pertaining to measurement specifications.

Starting the Measurement Task

  • Gather necessary materials:

    • Dimension paper, take-off sheets, scale rulers, and query sheets

  • Analyze gathered information and identify any missing data or assumptions that need clarification.

Door Schedule and Measurement Examples

  • Organize door schedules by type, size, and specifications, ensuring clarity in marking height, width, type, and count.

  • Use detailed descriptions for each door set, focusing on specifications like thickness, fire rating, and recommended manufacturers.

Concluding the Measurement Process

  • Confirm all take-off quantities for internal and external doors are accurate before compiling these into a final BoQ.

  • Utilize a take-off list as an organizational tool throughout the measurement process.

  • Always refer to specifications to ensure compliance with the required standards and practices.