Which scale is commonly used on commercial blueprints?

• A. 1/4 inch per foot
• B. 1/2 inch per foot
• C. 1/8 inch per foot
• D. 1 inch per foot

Answer: (C)

The scale commonly used on commercial blueprints is 1/8 inch per foot. This scale allows for a good balance between detail and compactness on the drawing. It is particularly useful for representing large projects where a larger scale, such as 1/4 inch per foot, might take up too much space on the paper or not fit into the intended viewing area. The 1/8 inch per foot scale provides enough detail to convey necessary information about dimensions and layout while keeping the blueprint manageable and easy to read.

As this is a standard practice, many architects and engineers prefer this scale because it can effectively show elements such as piping layouts, mechanical systems, and structural details without overwhelming the viewer with excessive information. This makes it a widely accepted choice in commercial plans and specifications.