General Contractor Practice Exam

On house wrap, how far do you lap the edges and ends?

1. 1 inch on edges and 4 inches on ends

2. 2 inches on edges and 6 inches on ends

3. 3 inches on edges and 5 inches on ends

4. 4 inches on edges and 8 inches on ends

The correct answer is: 2 inches on edges and 6 inches on ends

When installing house wrap, it is crucial to ensure that the edges and ends are properly lapped to maintain a waterproof barrier and improve energy efficiency. The standard practice is to overlap the edges by 2 inches and the ends by 6 inches. This overlap helps to direct water away from the home and prevents moisture from entering the wall assembly, which can lead to mold growth and structural damage. The 2-inch overlap on the edges is adequate to provide a secure seal while allowing for some flexibility in the application. The 6-inch overlap on the ends serves a more critical function by providing a significant barrier against water intrusion, especially in areas where wind-driven rain can be a concern. This specific measurement also aligns with building codes and manufacturer guidelines, ensuring compliance and effectiveness in moisture management. Understanding these specifications is essential for any general contractor to ensure the longevity and weather resistance of the building envelope.