General Contractor Practice Exam

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What is the most important function of mortar in a masonry wall?

Waterproofing
Bonding strength
Insulation
Aesthetic appeal

The correct answer is: Bonding strength

The most important function of mortar in a masonry wall is bonding strength. Mortar serves as the adhesive that holds the individual masonry units, such as bricks or blocks, together, ensuring structural integrity and stability. It effectively fills the gaps between these units, allowing for the transfer of loads across the masonry wall. This bonding capability is crucial because it not only secures the masonry units but also helps to distribute loads evenly, which can prevent failures or cracking due to weight or environmental factors. While waterproofing, insulation, and aesthetic appeal are also relevant to the overall performance and appearance of a masonry wall, they do not match the fundamental role of mortar in establishing and maintaining the cohesive strength of the structure. Waterproofing is typically achieved through other means, insulation often involves additional materials, and aesthetic concerns can be addressed through surface finishes rather than the core bonding function of mortar.