Blueprint Reading & Interpretation Flashcards

On a blueprint, a break line (a line with a zigzag) is used to:

Answer: Show that a long object has been shortened to fit on the drawing

Break lines allow draftsmen to shorten objects that are uniform along their length, conserving drawing space without losing meaningful information.

What does the designation 'Gr. 60' for rebar indicate?

Answer: The rebar has a yield strength of 60,000 psi

Grade 60 rebar (ASTM A615 Gr. 60) has a minimum yield strength of 60,000 psi, which is the most common grade used in US construction.

On a mechanical HVAC drawing, what does 'CFM' stand for?

Answer: Cubic Feet per Minute — a measure of airflow volume

CFM (Cubic Feet per Minute) quantifies the volume of air being moved through an HVAC system per minute.

A phantom line (alternating long dash, short dash, short dash) is typically used to show:

Answer: Alternate positions or removed parts for reference

Phantom lines depict alternate positions of moving parts, adjacent parts, or features that have been removed but are shown for reference.

When reading a door schedule on a set of blueprints, what information is typically found?

Answer: Door size, material, hardware, fire rating, and frame type

Door schedules cross-reference each door mark with its size, material, hardware set, fire rating, and frame type to coordinate installation.

What does the term 'setback' refer to on a site plan?

Answer: The distance the building must be set back from property lines per zoning

Setbacks are zoning-required minimum distances between a structure and property lines, rights-of-way, or other boundaries.

On a drawing, the symbol for welding that appears below the reference line of a weld symbol indicates the weld is on which side?

Answer: The arrow side (near side) of the joint

In the AWS welding symbol convention, weld information below the reference line applies to the arrow (near) side of the joint.