14.7.2. Drawing Procedure (Example: Residential Building)

1. Draw plot boundary

The first step in drawing a residential building plan is to establish the plot boundary. This means creating a defined area on your CAD drawing that represents the limits of the property where the building will be situated. This boundary serves as a reference point for all other elements of the design and ensures that the structure fits within the legal and physical confines of the land.

Think of drawing a plot boundary like outlining the edges of a puzzle piece. Without that outline, you cannot accurately place the pieces (or in this case, the building elements) inside.

2. Draw wall layout with layers

Next, you will create the wall layout. This involves using the CAD software to draw the lines that represent the walls of the building. Utilizing layers in CAD is crucial here, as it allows you to organize different elements of the drawing. For example, you might have a separate layer for the walls, another for doors, and another for electrical layouts. This organization helps improve the clarity and manageability of your design.

Imagine building a model with layers: just as you would add a layer for the foundation, walls, and roof, in CAD, each component gets its own layer to prevent confusion and enhance visibility.

3. Insert blocks for doors, windows, sanitary fixtures

In this step, you will insert blocks into your drawing for various fixtures like doors, windows, and sanitary items. Blocks are pre-drawn symbols that can be reused throughout your drawings. Using blocks saves time and ensures consistency in the design elements. For instance, when you insert a door block, it is already designed to the correct specifications, which improves the accuracy of your final plan.

Think of blocks like using cookie cutters for baking. Each cookie cutter shape (block) can be used multiple times, ensuring that your cookies (or in this case, fixtures) are all uniform and accurate without having to redraw each one from scratch.

4. Add dimensions and labels

Once the main components are in place, it’s important to add dimensions to your drawing. Dimensions indicate the size and distance between elements in the plan. Labels provide context and details about each part of the structure, such as identifying which rooms are which or specifying materials. Clear dimensions and labels are essential for anyone interpreting the plans to understand the scale and layout of the building.

Adding dimensions and labels is similar to adding a legend or scale to a map. Just like a map needs clear markers to guide you, your building plan requires dimensions and labels to guide construction workers and architects.

5. Apply hatching for materials

Hatching refers to the patterned filling applied to areas in your drawing to represent different materials, such as concrete, brick, or landscaping. Applying hatching helps visually distinguish between these materials, enhancing the overall comprehensibility of the plan. In CAD, hatching can be customized in terms of scale and pattern to properly reflect the material usage.

Applying hatching is like using a color code on a map. Just as you may use different colors to indicate forests, water, and urban areas, hatching indicates various construction materials, making it easier for builders to understand the plan.

6. Create elevation and section from plan

This step involves producing elevation and section views based on the previously drawn floor plan. Elevations represent how the building will look from each side, while sections show internal structures as if it was sliced through a particular point. These views are critical because they provide additional details that the floor plan alone cannot convey.

Creating elevation and section views is like taking different angles of a photo. Just as you need to capture images from various perspectives to fully understand a landscape, these views help express the building’s dimensions and internal layout more completely.

7. Use layout for plotting to scale

The final step is using the layout feature in your CAD software to prepare the drawing for printing or plotting. This involves arranging the drawing on a standardized paper size and ensuring that the scale is appropriate for printing. Proper scaling ensures that all dimensions match the actual size of the building when construction commences.

Think of this step as setting up a photo for framing. Just as you need to ensure the picture fits perfectly within the frame and is the right size to display correctly, your drawing must be plotted to scale so that builders can accurately interpret the plan on physical paper.

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