Often times, measuring will not be enough to locate pipes and other rough-in items. Particularly for modern projects which have critically aligned walls or finished concrete floors. We pull strings to ensure pipes are in a straight line along walls. This prevents walls from having to be thickened or shifted at the framing stage. It allows floor roughness around pipes to remain hidden under walls rather than be visible in the room.
We work hard to find the hidden information in plans to meet the aesthetic expectations of high quality modern architecture. Multiple planes intersecting are common challenge where we know a crisp point will be important. We made these sketches to demonstrate an issue for architect approval, then used them to communicate its importance to the framers.