3/4" channel must weigh at least _____ per 100 lineal feet:

3/4" channel must weigh at least _____ per 100 lineal feet:

• A. 100 lb
• B. 200 lb
• C. 300 lb
• D. 400 lb

Answer: (C)

In plaster support systems, the strength and stiffness of the metal channel used as a furring member determine how well the plaster will stay in place without excessive deflection. Heavier channels resist bending better, which helps keep lath and plaster evenly supported across the span and reduces the risk of plaster cracking or cracking at joints. For a 3/4" channel, the specification sets a minimum weight of 300 pounds per 100 lineal feet. That equates to about 3 pounds per linear foot, providing enough rigidity to support typical plaster thickness and the moisture and live loads it can encounter, while keeping deflection within acceptable limits. Lighter options would deflect too much under the plaster weight, leading to cracking or failings over time, whereas a heavier option would add unnecessary cost without improving performance for standard installations.

In plaster support systems, the strength and stiffness of the metal channel used as a furring member determine how well the plaster will stay in place without excessive deflection. Heavier channels resist bending better, which helps keep lath and plaster evenly supported across the span and reduces the risk of plaster cracking or cracking at joints.

For a 3/4" channel, the specification sets a minimum weight of 300 pounds per 100 lineal feet. That equates to about 3 pounds per linear foot, providing enough rigidity to support typical plaster thickness and the moisture and live loads it can encounter, while keeping deflection within acceptable limits. Lighter options would deflect too much under the plaster weight, leading to cracking or failings over time, whereas a heavier option would add unnecessary cost without improving performance for standard installations.