Interpretation of working drawings is a fundamental skill for Quantity Surveyors in Kenya, as these drawings form the basis for accurate measurement, cost estimation, and project planning. Understanding how to identify and interpret different types of drawings ensures that professionals can extract relevant information efficiently and avoid costly errors. This chapter focuses on developing the ability to recognize drawings based on their titles, an essential step in navigating complex construction documents.

1.1 Identify Drawing Based on Drawing Title

In the Kenyan construction industry, project documentation typically includes a variety of technical drawings, each serving a distinct purpose. Being able to identify a drawing by its title enables Quantity Surveyors to locate the correct sheets quickly and apply the information appropriately during measurement and valuation. This skill supports effective communication with architects, engineers, and contractors, fostering smooth project execution.

1.1.1 Understanding Drawing Titles: Components and Structure

Drawing titles often contain standardized components that convey critical information about the drawing’s content and scope. Recognizing these components helps Quantity Surveyors distinguish between different drawing types and their specific uses in measurement.

• Project Name: This identifies the overall construction project, such as "County Government Office Complex" or "Nairobi General Hospital Expansion." It links the drawing to a particular contract or site.
• Drawing Type: Common types include "Site Plan," "Floor Plan," "Elevation," "Section," and "Detail." Each type indicates a different view or aspect of the building or structure.
• Drawing Number: A unique identifier, often alphanumeric (e.g., A-101, S-202), that helps organize and reference drawings within a set.
• Revision Number/Date: Indicates the version of the drawing, reflecting updates or changes made after initial issue. This prevents use of outdated information.
• Scale: Usually stated as a ratio (e.g., 1:100, 1:50), it shows the drawing’s proportional size relative to the actual building, essential for accurate measurement.
• Discipline Code: Letters such as "A" for architectural, "S" for structural, "M" for mechanical, or "E" for electrical drawings specify the professional field responsible for the drawing.

1.1.2 Types of Drawing Titles and Their Implications for Quantity Surveying

The title of a drawing directly reflects its content and the kind of information it provides, which influences how a Quantity Surveyor approaches measurement.

• Site Plans: These drawings show the entire project site, including boundaries, access roads, landscaping, and location of buildings. Measurements from site plans are used for earthworks, external works, and setting out.
• Floor Plans: Depict horizontal sections of a building at a particular level, showing walls, doors, windows, and room layouts. Essential for measuring internal finishes, partitions, and fittings.
• Elevations: Vertical views of building faces, illustrating external finishes, heights, and architectural features. Useful for measuring external cladding, windows, and roof elements.
• Sections: Cut-through views that reveal internal construction details, such as wall thicknesses, floor slabs, and foundations. Critical for understanding building components not visible in plans or elevations.
• Detail Drawings: Focus on specific parts of the building, such as joinery, staircases, or special fixtures. They provide precise dimensions required for specialized measurements.

1.1.3 Reading and Interpreting Drawing Titles in Kenyan Practice

Kenyan construction projects often follow British Standards or ISO conventions, which influence how drawing titles are formatted and presented. Quantity Surveyors must be familiar with these conventions to interpret titles correctly.

• Standardized Title Blocks: Located typically at the bottom right corner of a drawing sheet, title blocks contain all essential identification information, including project name, drawing title, number-scale, and revision.
• Use of Abbreviations: Titles may include abbreviations such as "FLR" for floor, "ELE" for elevation, or "SEC" for section. Understanding these abbreviations speeds up identification.
• Language and Terminology: While English is the primary language, some projects might include bilingual titles or local terminologies. Awareness of local terms for building components or phases is helpful.
• Consistency Across Disciplines: Titles must be consistent within the project to avoid confusion. For example, all architectural drawings might start with "A," followed by a number, which differs from structural drawings starting with "S."
• Checking Revision History: Kenyan contracts often require the Quantity Surveyor to verify that the drawing version in use is the latest to prevent errors from superseded drawings.

1.1.4 Common Challenges and Strategies in Identifying Drawings by Title

Despite standardized practices, Quantity Surveyors encounter challenges in correctly identifying drawings, especially on complex projects or where documentation is inconsistent.

Challenges

• Inconsistent Naming: Some projects may have non-standard or incomplete titles, making it difficult to ascertain the drawing’s purpose.
• Multiple Revisions: Frequent updates can cause confusion if revision numbers or dates are not clearly marked.
• Similar Titles: Drawings with similar names (e.g., "Ground Floor Plan" vs. "Ground Floor Reflected Ceiling Plan") require careful attention to avoid misinterpretation.
• Poor Quality Prints: Faded or unclear title blocks reduce readability and increase the risk of errors.
• Language Barriers: Use of unfamiliar terminologies or abbreviations can hinder understanding.

Strategies

• Cross-Referencing: Compare drawing titles with the project specification or index sheets to confirm relevance.
• Request Clarification: Engage with architects or engineers when titles or drawings are unclear.
• Maintain a Drawing Register: Keep an updated log of drawings with titles, numbers, and revision status for easy tracking.
• Use Digital Tools: Employ electronic drawing management systems that highlight latest revisions and provide searchable titles.
• Training and Familiarisation: Regularly review standard drawing titles and conventions used in Kenyan projects to build familiarity and confidence.

Chapter Summary

This chapter focused on interpreting working drawings by first teaching how to identify a drawing through its title, which provides essential information about the type and purpose of the drawing. It then covered the skill of reading and scaling drawing dimensions accurately according to the specified units of measure, ensuring precise measurement interpretation. Understanding the geometry of a drawing was emphasized by identifying the shape represented, which aids in visualizing the structure or component. The chapter also highlighted the importance of reading and correlating schedules alongside the drawings, as these provide detailed specifications and quantities necessary for construction. Together, these skills equip learners to effectively analyze and use working drawings in building measurement tasks. Mastery of these topics is fundamental for accurate quantity take-offs and project planning in construction.