Engineer critiques CMU construction methods in McCall building project

The Special City Council Meeting held on May 13, 2025, in McCall, Valley County, Idaho, focused on critical discussions regarding the structural integrity of a new building project. The meeting highlighted concerns about the construction methods being employed, particularly the use of concrete masonry units (CMU) without proper reinforcement.

During the meeting, a council member emphasized the importance of grouting solid walls in new CMU buildings. They pointed out that the current building design lacks this essential feature, which could compromise its stability. The speaker explained that CMU blocks, commonly referred to as cinder blocks, are not structurally sound unless filled with grout and reinforced with rebar. Without these reinforcements, the blocks serve merely as a form and may not withstand significant loads or pressures.

The discussion included technical terminology, clarifying that unreinforced masonry (URM) refers to CMU that lacks both grout and reinforcement. This absence raises concerns about the effectiveness of bolts used in the construction, as they would not anchor securely into the walls. The speaker noted that the design's running bond, where each level of CMU is offset from the one above, is a positive aspect, but it is only beneficial if the walls are properly grouted.

The meeting underscored the need for careful consideration of construction practices to ensure safety and durability in building projects. As discussions continue, the council will likely address these structural concerns to safeguard the integrity of future developments in McCall.