Interpretation of working drawings is a fundamental skill for Quantity Surveyors in Kenya, as it underpins accurate measurement, costing, and project management. Working drawings provide the detailed visual representation of construction projects, essential for understanding the scope and specifics of building works. Mastery of drawing titles and their identification enables surveyors to navigate complex documentation efficiently, ensuring precise quantity take-offs and effective communication with stakeholders.

1.1 Identify drawing based on drawing title

The ability to identify a drawing correctly from its title is crucial in Quantity Surveying, as it directs the professional to the specific information required for measurement and costing. Drawing titles follow standardized conventions that reflect the nature and purpose of the drawings, facilitating quick recognition and reducing errors on site and in the office. In Kenyan construction projects, familiarity with these titles improves collaboration among architects, engineers, contractors, and quantity surveyors.

1.1.1 Structure of Drawing Titles

Drawing titles are structured to convey clear and concise information about the drawing’s content and purpose. Understanding this structure helps Quantity Surveyors locate relevant drawings without confusion.

• Project Identification: The drawing title typically begins with the project name or code, linking the drawing to a specific construction project. This ensures all documents are traceable within large portfolios.
• Drawing Type: This section specifies the nature of the drawing, such as "Floor Plan," "Elevation," "Section," or "Detail," indicating the type of view or information presented.
• Drawing Number: A unique identifier follows the drawing type, often including a sequence or code that organizes drawings logically within a set.
• Revision Number: Indicates the latest update or amendment to the drawing, essential for ensuring measurements are based on current information.
• Scale: The drawing title may also mention the scale used, for example, 1:100 or 1:50, which is vital for accurate interpretation and measurement.
• Date and Author: The title block often contains the date of issue and the drafter’s or firm’s name, assisting in document control and accountability.

1.1.2 Common Drawing Titles and Their Meaning

Recognizing common drawing titles is necessary for Quantity Surveyors to extract relevant data quickly and avoid misinterpretation that could lead to cost overruns.

• Site Plan: Shows the entire construction site layout, including boundaries, existing structures, access roads, and topography. It is used for setting out and preliminary measurements.
• Floor Plan: Depicts the arrangement of rooms, walls, doors, and windows at a particular floor level. It is the primary source for measuring areas and finishes.
• Elevation: Illustrates the external faces of the building, showing heights, finishes, window and door placements. Useful for façade measurements and external works.
• Section: A vertical cut through the building showing internal construction details, floor levels, and structural components. Essential for understanding wall thicknesses and floor build-ups.
• Detail Drawing: Provides enlarged views of specific components or junctions, such as staircases or window frames, critical for precise quantity take-offs of complex elements.

1.1.3 Standards and Conventions in Drawing Titles

Drawing titles in Kenya adhere to international and local standards to maintain consistency and clarity across projects.

• BS 1192 and ISO 128: These standards guide the presentation and naming conventions of construction drawings, ensuring uniformity in title blocks and drawing identification.
• Kenya Bureau of Standards (KEBS): KEBS incorporates international standards and may specify additional requirements for drawing documentation in public projects.
• Title Block Placement: The title is usually located at the bottom right corner of the drawing sheet, containing all necessary identification details.
• Abbreviations and Codes: Standard abbreviations like "FP" for Floor Plan or "EL" for Elevation are commonly used to shorten titles while retaining clarity.
• Revision Control: Drawings must indicate revision status clearly, with a revision history table often included near the title block to track changes.

1.1.4 Practical Approach to Identifying Drawings on Site and Office

Quantity Surveyors must apply systematic methods to identify and verify drawings, reducing errors and improving workflow efficiency.

• Cross-Referencing: Always cross-check the drawing title with the drawing number and revision status against the project document register to ensure the correct version is used.
• Visual Inspection: Familiarize yourself with the drawing layout and symbols to confirm the drawing type matches the title description.
• Consultation: Engage with architects and engineers when titles or drawings appear ambiguous or inconsistent, ensuring clarity before measurement.
• Digital Tools: Use project management software or drawing viewers that allow searching and filtering by drawing titles for rapid retrieval.
• Documentation: Maintain a log of drawings reviewed, including title details and dates, to track which versions have been used in quantity measurement.

Chapter Summary

This chapter focused on interpreting working drawings by first guiding students to identify drawings accurately through their titles. It emphasized the importance of reading and scaling drawing dimensions correctly according to the specified units of measure to ensure precise measurements. Students learned to recognize the shapes represented in drawings by analyzing their geometric forms, which aids in understanding the design intent. The chapter also covered how to read and correlate schedules alongside the drawings, enabling the extraction of detailed information such as quantities and material specifications. Together, these skills enable effective comprehension and use of technical drawings in building works measurement. Mastery of these topics ensures that students can confidently interpret drawings for practical construction applications.