However...sometimes it doesn't occur to the contractor to ask. They assume their reading is correct and do something totally unintended. Sometiems these errors are huge, and sometimes, they're silly, like our first detail. This was on a project of a former colleague of Sarge's. We often note details in a plan by putting a dashed circle or rectangle around the detail and note the sheet and detail number off to the side and connect the detail and sheet number to the dashed circle with a line called a leader line. This sort of detail is shown on the right. However, the contractor interpreted this as the edge of the top step and built it as shown on the left. As the architect commented to Sarge, "They built the fucking leader line."
Below is another detail on a project a friend of mine worked on several years ago. This is a drywall soffit in a hallway. You can see the lines that go from the wall to the edge of the curved soffit; those are control joints, which allow large expanses of drywall to expand and contract with heat. But see the line running longways down the soffit?
That line is actually a grid line. A grid line is an imaginary line that runs through the center of the structural columns and is used not only to locate the columns and beams but is also used to help dimension other things in the floor plans and ceiling plans. So, the outer edge of the curve of this soffit was dimensioned off this gridline. However, the contractor read this in reverse--he thought that the architect was trying to show an architectural reveal in the underside of the soffit dimensioned off the edge of the soffit. While this doesn't violate any codes, it just looks doofy. it's the only soffit in the hall with this line in it. "They built the grid line in, Pixie!" my friend sighed. "It looks different from everything else on the plan, but they read it like it was a reveal! What the hell?"
I'll have something more amusing tomorrow, but believe me, when we passed these details around our office, we howled with laughter.
I know, I know...we're total archinerds....