Codes and Standards
The Codes and Standards domain tests your ability to identify the model code provisions and referenced standards that govern masonry design, materials, and construction, and to apply them without substituting personal preference for project requirements.
The governing framework
- The International Building Code addresses masonry in Chapter 21 and adopts TMS 402 for design and TMS 602 for construction. Older documents may cite ACI 530/ASCE 5, the predecessor designation for the design standard.
- ASTM standards define products and test methods: C90 for loadbearing concrete masonry units, C216 for facing brick, C270 for mortar, C476 for grout, C1314 for masonry prism testing, and C140 for sampling masonry units.
- Mortar Types M, S, N, and O differ in cementitious content and intended use. Type S is common for below-grade and moderate-exposure work; Type N is common above grade. The project specification and structural design govern.
- TMS 602 addresses construction requirements, including grout placement. Grout is typically specified with an 8 to 11 in. slump to permit consolidation.
- Special inspections are triggered by IBC Chapter 17 and the project statement of special inspections.
Worked example
A submittal for a foundation wall in earth contact proposes Type N mortar. The specification is silent on exposure. The reviewer should not silently approve a substitution or direct a change in the field. The correct action is to compare the submittal with TMS 402, TMS 602, the drawings, and the geotechnical/exposure information, then issue an RFI documenting the potential nonconformance and await the design professional's response. The reasoning: the contractor builds to the contract documents, and only the design professional can approve a mortar change that affects structural or durability performance.
Traps that cost marks
Confusing TMS 402 (design) with TMS 602 (construction); treating ASTM C90 as an appearance-only standard; ignoring local amendments; and citing a superseded code edition after the project's governing edition is established.
Key points
- IBC Chapter 21 adopts TMS 402 for design and TMS 602 for construction.
- ASTM C90, C216, C270, C476, C1314, and C140 cover core masonry products and tests.
- Mortar type must follow exposure, structural demand, and the specification, not habit.
- Grout slump is a placement requirement, not an arbitrary field preference.
- Special inspection requirements come from IBC Chapter 17 and the project-specific inspection plan.