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In the code for single- and two-family dwellings, how close can holes bored in joists be to the top or bottom of the member?

  1. 1/2 inch

  2. 2 inches

  3. 1 1/2 inches

  4. 1 inch

The correct answer is: 2 inches

Holes bored in joists for single- and two-family dwellings must adhere to specific code requirements to ensure structural integrity. When it comes to how close these holes can be to the top or bottom of a joist, the required distance is commonly set at 2 inches. This measurement helps maintain the strength and load-bearing capabilities of the joist, reducing the risk of structural failure. The 2-inch distance allows for the necessary material to remain around the hole, preserving the overall structural capacity of the joist. By keeping holes at this minimum distance, it mitigates stress concentrations that could occur if the holes were drilled too close to the edges of the joist, which might lead to cracking or weakening of the wood. Understanding these requirements is crucial for construction supervisors, as adhering to them is essential for ensuring safety and compliance with building codes.