According to the Code, what is the minimum compressive strength (psi) for plain concrete used in basement walls and foundations?

The minimum compressive strength for plain concrete used in basement walls and foundations, according to building codes, is 2500 psi. This strength is specified to ensure that the concrete can adequately support the loads and stresses imposed on the basement walls and foundation. Concrete with this minimum strength provides a good balance between durability and workability, making it suitable for sub-grade applications where moisture exposure can occur.

Strength is critical in structural applications, particularly in foundations and basement walls, as they are subjected to both vertical loads from the building above and lateral pressures from soil and water. Using concrete with the specified compressive strength helps mitigate the risk of cracking, settling, or failure under these conditions, ensuring the structural integrity of the building.

A lower compressive strength might not provide sufficient strength and durability, increasing the potential for structural issues over time. Therefore, 2500 psi is established as the baseline in the code to safeguard against such risks.