Blueprint Reading & Technical Specifications Flashcards

What does a bold triangle symbol with a number inside it on a detail drawing reference?

Answer: A detail reference pointing to an enlarged drawing on another sheet

A detail reference triangle contains the detail number and sheet number, directing the reader to an enlarged view of that condition.

A specification calls for lumber to be 'S4S.' What does this mean?

Answer: Surfaced on 4 sides

S4S means the lumber has been surfaced (planed smooth) on all four sides, producing consistent, clean dimensions.

On architectural drawings, what does the abbreviation 'CLG HT' refer to?

Answer: Ceiling Height

'CLG HT' is standard shorthand for Ceiling Height, indicating the vertical distance from finished floor to finished ceiling.

Which drawing in a construction set typically shows stair tread depth, riser height, and total run?

Answer: Stair section or stair detail

A stair section or dedicated stair detail provides the vertical and horizontal layout including tread, riser, and total run dimensions.

What is the meaning of 'UNO' as used in construction specification notes?

Answer: Unless Noted Otherwise

'UNO' stands for Unless Noted Otherwise, meaning the stated condition applies everywhere except where a specific exception is called out.

A reflected ceiling plan (RCP) shows the ceiling as if:

Answer: A mirror placed on the floor reflects the ceiling upward

An RCP uses the convention of a mirror on the floor reflecting upward, so left-right orientation matches the floor plan below it.

On a window schedule, the column labeled 'R.O.' most likely refers to:

Answer: Rough Opening

R.O. stands for Rough Opening, which is the framed opening size required to receive the window unit including clearance for shimming.