A commercial building inspector is reviewing the excavation for a new foundation. The soil conditions are determined to be expansive. Which of the following actions should be taken to mitigate the potential for foundation damage?
- AIncrease the depth of the foundation to a greater depth than the soil bearing capacity.
- Install a geosynthetic reinforcement layer under the foundation.
- CUse a shallow foundation with a wider base.
- DIncrease the size of the foundation pier to distribute the load.
Exam tip
Remember that geosynthetic reinforcement layers are a common solution for expansive soil conditions.
Why B is correct
According to Section 1806.3.1 of the 2021 IBC, geosynthetic reinforcement layers can be used to mitigate the effects of expansive soils. This is the correct action to take to prevent foundation damage.