Massachusetts Construction Supervisor License (CSL) Practice Test

What is the minimum screw or bolt size required for connecting a pressure treated deck ledger to a 2 inch nominal lumber band joist?

1. 3/8 inch

2. 1/2 inch

3. 5/8 inch

4. 7/8 inch

The correct answer is: 1/2 inch

To ensure a safe and secure connection between a pressure treated deck ledger and a 2-inch nominal lumber band joist, following building code requirements is essential. The minimum screw or bolt size of 1/2 inch is specified to provide sufficient shear strength and load-bearing capability for the structural connection involved in supporting the deck. Using a 1/2 inch bolt or screw aligns with standard construction practices that prioritize durability, especially in outdoor environments where pressure treated materials are commonly used. These materials were treated to resist moisture and decay, necessitating robust fasteners that can handle the additional stresses from environmental factors, as well as the weight of the deck and any additional load it may carry. The other sizes listed, though potentially usable in different contexts or for different applications, do not meet the minimum requirement set forth for this specific connection, resulting in a less reliable structure if smaller fasteners were utilized. Thus, 1/2 inch serves as the baseline that ensures compliance with safety standards and building codes for deck construction.