Fundamentplan

Fundamentplan, or foundation plan, is a technical drawing used in construction and civil engineering to show how a building's foundations are arranged and how loads are transferred to the ground. It is part of the structural documentation and provides precise information necessary for excavation, formwork, and concrete work. The plan depicts the locations and types of foundations such as footings, piles, piers, stem walls, and grade beams, as well as the position of bearing walls and columns that transfer loads to the soil. It typically shows the size, shape, depth, and spacing of foundations, as well as any required anchors, bolts, or embedded plates.

A fundamentplan usually includes grid lines, axis references, and dimensions for excavation and construction tolerances. It may include notes on soil bearing capacity, frost depth, drainage, waterproofing, and geotechnical considerations. Details for reinforcement in footings and walls, concrete grades, and special features such as frost protection or radon barriers are commonly included. Depending on the project, additional information may cover slabs on grade, crawl spaces, or basements and the treatment of penetrations for utilities.

The fundamentplan is typically prepared by a structural engineer and is used by architects, contractors, and builders to guide excavation, formwork, reinforcement placement, and concrete pouring. It must comply with applicable building codes and standards and is coordinated with other drawings such as site plans, architectural plans, and services plans. In some regions the foundation plan is a standalone document; in others it is part of the structural drawings.