To prevent future conflict, some builders require each subcontractor to sign off on an existing installation prior to allowing them to move material and equipment onto the jobsite and start their work. That means the elevation of the footings is directly related to the reference height of the stem walls and the corresponding elevation for the floor, wall, and roof framing. The foundation stem walls extend from the top of the concrete footing up to the bottom of the sill plates that support the structural framing. The workpoint is used to check the elevation of the footings and mark the corners of the foundation walls, verifying the string line intersections ( see Part 10 Foundation Footings). Verification of existing conditions is especially important when the masonry contractor is not the builder who installed the concrete footing. The concrete blocks are laid using common tools and reinforced with horizontal and vertical steel that is embedded in grout to form an integrated structural system.īefore beginning the wall’s construction, the site is cleared for safety, string lines are replaced on the batter board, and the foundation is checked for compliance with the construction documents prior to finalizing preparations for the work. The foundation walls for this building are constructed with standard concrete masonry units (CMU). Cast concrete walls have the advantage of being a strong monolithic structure in wet or difficult soil and are required by code for earthquake engineering, heavy loads, and some soil, ground water, or site conditions The stem walls and piers could be built using cast-in-place concrete with rigid or insulated forms. See the website for the Southern Forest Products Association. Stem walls make it possible to raise the floor level for storm cellars, basements, or mechanical crawl space.Ī raised foundation also changes the profile of a building, reducing potential moisture penetration, mold and mildew, insects and insecticide contamination, and makes it easier to add or modify the house as mechanical requirements change over time. With the site cleared for the next step in the foundation’s construction, a stem wall is needed to support the floor framing. Excavation, 3.Foundation, 4.Framing, 5.Roof, 6.Close, 7.MEP, 8.Finish) ( Introduction, Syllabus, 1.Prelims, 1-4Precon, 2.
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