Technical drawing is an essential skill for interior design professionals in Kenya, enabling clear communication of design concepts to clients, contractors, and regulatory bodies. Accurate presentation of drawings using correct line types and symbols ensures that interior spaces are realized as envisioned, reducing costly errors during implementation. This chapter focuses on the foundational practices of mounting drawing sheets and identifying key elements such as border lines and title blocks, which are critical for producing professional and standardized interior design drawings.

2.1 Mounting Drawing Sheets

Mounting drawing sheets correctly is a vital preparatory step in producing interior design technical drawings. In Kenya, interior designers often collaborate with architects and contractors who require drawings to be presented on durable and standardized mounting mediums. Proper mounting protects drawings from damage during handling and presentation, facilitates easy storage, and maintains the integrity of the drawing throughout the design and construction process.

2.1.1 Purpose of Mounting Drawing Sheets

• Protection of Drawings: Mounting prevents tears, smudges, and creases, preserving the quality of detailed interior design plans such as furniture layouts and finish schedules.
• Ease of Handling: Mounted sheets are rigid, allowing designers, clients, and contractors to handle them without risk of folding or damage.
• Standardization: Mounting ensures drawings conform to standard sizes accepted by Kenyan regulatory bodies, such as the National Construction Authority (NCA), facilitating approvals and documentation.
• Presentation Quality: Mounted drawings present a professional appearance during client meetings and tender submissions, reinforcing the credibility of the interior designer.
• Durability for Archiving: Mounted sheets are easier to store in filing systems or portfolios, enabling long-term reference during renovations or maintenance.

2.1.2 Types of Mounting Materials Used in Interior Design

• Cardboard Mounting Boards: Typically 3-5 mm thick, these provide a firm backing ideal for display and presentation. They are lightweight but sturdy enough to protect delicate tracing paper or vellum.
• Foam Boards: Lightweight and slightly thicker, foam boards offer cushioning and are useful for mounting larger interior elevation drawings requiring rigidity.
• Adhesive Spray Mounts: Used to bond paper to mounting boards evenly without wrinkles or bubbles, ensuring a smooth finish.
• Self-adhesive Mounting Sheets: These sheets come with a peel-off backing and are convenient for quick and clean mounting of interior design sketches and draft drawings.
• Plastic Sheet Protectors: Transparent covers that protect drawings while allowing viewing without direct handling, often used for frequently referenced interior finish schedules.

2.1.3 Step-by-Step Procedure for Mounting Drawing Sheets

1. Select Appropriate Mounting Board: Choose a board size that matches the drawing sheet dimensions and is compatible with the drawing medium.
2. Prepare the Drawing Sheet: Ensure the drawing is clean, dry, and free from dust or debris.
3. Apply Adhesive Evenly: Use an adhesive spray or glue stick to cover the back of the drawing sheet uniformly, avoiding excess that may cause warping.
4. Align Drawing on Mounting Board: Carefully position the drawing sheet starting from one edge to avoid trapping air bubbles.
5. Press Firmly and Smooth Out: Use a clean roller or flat tool to press the sheet onto the board, smoothing from the center outward to eliminate wrinkles.
6. Trim Excess Board if Necessary: After adhesion, trim the mounting board edges neatly to match the drawing sheet size.
7. Label and Store: Add identification marks or labels on the back and store mounted drawings flat or upright in portfolios.

2.1.4 Maintenance and Handling of Mounted Drawings

• Avoid Direct Sunlight: Prolonged exposure can cause fading or warping of mounted sheets.
• Handle with Clean Hands or Gloves: Prevents oil or dirt transfer that can damage the drawing surface.
• Store Vertically in Dry Areas: Minimizes deformation and moisture damage.
• Use Protective Covers: When transporting mounted drawings to client sites or construction areas.
• Inspect Regularly for Damage: Repair any loose edges or tears promptly to maintain presentation quality.

Chapter Summary

This chapter covered the essential practices for preparing technical drawings, beginning with the correct mounting of drawing sheets to ensure stability and neatness. It emphasized the identification and proper use of border lines and title blocks, which provide critical information and framing for the drawing. The chapter detailed the standards for lettering styles, promoting uniformity and readability in all technical documents. Various types of lines were explained, including their thicknesses and styles, alongside their specific applications in representing different features of a drawing. Techniques for dimensioning were introduced to accurately convey measurements and spatial relationships. Architectural symbols were presented as standardized graphical representations to simplify complex information. The importance of clarity in drawings was stressed to avoid misinterpretation and ensure effective communication. Finally, practical methods for dividing lines and circles into equal parts and ratios were demonstrated, including procedures for inscribing and circumscribing circles, which are fundamental skills in technical drawing.