Large-scale views

Based on National CAD Standard 3.1 PDF pages 403-408

Large-scale views are provided when additional detail is needed in plans or sections that cannot easily be accommodated within the conventional scales. Such views are typically made for stairwells, elevator shafts, kitchens, bathrooms, and so on. Do not duplicate the detailed information or dimensions found in the large-scale views, except as necessary or useful for orientation, or labeling. Thus, there should be some basic overall dimension-string data in the small-scale (regular-scale) plans or sections that can be also found in the large-scale view, so that the additional dimensional detail in the large-scale-view can be related to the regular plans or sections.

The views to be enlarged are identified on the regular plans or sections by enclosing them with a dashed line connected to a location symbol (like a detail symbol).

Stairs

Stairs are a special case, since they occur on multiple floor levels and are related (connected) one to the other. Therefore, group the stair plans and sections together, if possible. Stair plans show number and size of treads; stair sections show number and size of risers. Identify handrails and guardrails, and any special nosing conditions (e.g., metal safety nosings).

Note that concrete stairs are typically detailed on the structural drawings, so they need not (should not) be duplicated on the architectural set.

Use break lines on sections to eliminate duplicate conditions in multistory buildings.

Elevator drawings

Much of the detailed information for elevators and their shafts is provided by manufacturers (i.e., it is unlikely that the architect is designing the critical elevator specifications). Custom-designed elevator cabs, however, require architect-drawn interior elevations. Elevator shaft sections should include: the pit, ladder, sills (with details for the ladder and sills); various vents for hydraulic elevators; guide rail support in certain cases; typical door head and sill; machine room penthouse for traction elevators.