Massachusetts Construction Supervisor License (CSL) Practice Test

Which component is critical for the integrity of a masonry wall?

1. Using lightweight blocks

2. Maintaining proper mortar thickness

3. Aligning blocks at random

4. Reducing mortar use

The correct answer is: Maintaining proper mortar thickness

Maintaining proper mortar thickness is essential for the integrity of a masonry wall because the mortar serves multiple important functions. It acts as a bonding agent that holds the masonry units together and helps to distribute load evenly across the wall. Proper mortar thickness ensures that there are no gaps that could weaken the bond, leading to potential structural failures. It also contributes to the wall's resistance to water infiltration, which can cause damage over time if not addressed. A consistent mortar joint helps maintain the wall's overall aesthetic and functional performance, preventing issues like cracking or shifting that could compromise its longevity. Using lightweight blocks might influence the overall weight and handling of the structure, but it does not directly contribute to the wall's bond or load distribution in the same way proper mortar thickness does. Aligning blocks at random is detrimental to the structural integrity since it can lead to misalignment and uneven stress distribution. Reducing mortar use may seem cost-effective but can lead to inadequate bonding and decreased structural integrity over time.