Which drawings does the foundation contractor primarily rely on and coordinate with during construction?

Introduction / Context:
Foundation work sets a project’s physical footprint and elevations. Accurate placement and sizing require multiple drawings because location, geometry, and load paths are interconnected.

Given Data / Assumptions:

• Available drawings include foundation plan, site plan, and floor plan.
• The contractor must locate the foundation on the property and coordinate its size with the building layout.
• Elevation datums and setbacks may also be involved.

Concept / Approach:

The foundation contractor needs the foundation plan for footings, walls, and reinforcing; the site plan for setbacks, grading, and orientation; and the floor plan for wall locations, column grids, openings, and bearing information. Therefore, all three are used together.

Step-by-Step Solution:

Verification / Alternative check:

Field practice requires cross-referencing these drawings to avoid misalignment between the foundation and superstructure.

Why Other Options Are Wrong:

Relying on only one plan risks placement errors and conflicts with architectural layout and zoning constraints.

Common Pitfalls:

Ignoring site plan setbacks or grades can cause costly relocation or rework. Ensure all three drawings agree before excavation.

Final Answer:

all of the above