What Does TMS 402 Require for Structural Masonry Design?

TMS 402 requires engineers to design masonry for the applicable loads using either allowable stress or strength design, covering compressive, flexural, and shear capacity of walls, columns, pilasters, and beams — with grout, mortar, and reinforcement specified to match the design assumptions. TMS 602 then requires the construction to be built and inspected to those assumptions, with inspection levels set by tables keyed to risk category and seismic design category. The practical consequence is that masonry engineering is a two-part deliverable: calculations and drawings that satisfy 402, plus specifications and an inspection plan that satisfy 602. Projects get in trouble when the design assumes fully grouted, inspected reinforced masonry but the specs and inspection plan describe something lighter. We keep the design assumptions, the specs, and the inspection level explicitly linked so the wall that gets built is the wall that was designed.

Unlike steel, which arrives from the shop with mill certs, or concrete, which gets cylinder breaks, masonry's quality is created on the scaffold — one unit, one mortar joint, one grout lift at a time. Low-lift grouting versus high-lift grouting changes what's inspectable. Reinforcement that's supposed to be centered in the cell but ends up against the face changes the wall's capacity. Mortar mixed too wet loses strength. Every one of these is invisible once the wall is finished, which is exactly why the inspection tables exist. Our approach is to make the field requirements unmistakable: grout lift heights on the drawings, cleanout locations for high-lift grouting, inspection hold points in the specs, and preconstruction meetings where the mason and inspector walk through the requirements together. Masonry done right is durable, economical structure — but 'done right' has to be verified while the work is open, not assumed afterward.

Address these before masonry construction starts and the walls go up without surprises.

• Select the design method and confirm the masonry shear wall type suits the Seismic Design Category
• Set the TMS 602 inspection level from the risk category and SDC, and show it in the documents
• Specify grout type, lift heights, and cleanout requirements the mason can actually build
• Detail reinforcement placement with tolerances that keep bars where the design assumes
• Coordinate veneer anchorage and support separately from the structural backup wall
• Hold a preconstruction meeting with the mason and inspector on grouting and hold points