The correct house wrap lap for edges and ends is?

The correct house wrap lap for edges and ends is?

• A. 2 inches on edges and 6 inches on ends
• B. 6 inches on edges and 6 inches on ends
• C. 4 inches on edges and 8 inches on ends
• D. 6 inches on edges and 10 inches on ends

Answer: (A)

The important idea here is choosing laps that keep the exterior moisture barrier continuous while accounting for wind and movement. Edge laps are where one sheet overlaps the next along a wall edge, and these spots are typically flashed or sealed with tape, so a smaller overlap is sufficient and helps avoid bulk at the edge. End laps are where sheets butt end-to-end; these joints are more exposed to wind-driven water and expansion/contraction, so a larger overlap is used to ensure the joint stays covered and sheds water even if the sheets shift a bit. Therefore, the recommended practice is 2 inches at the edges and 6 inches at the ends, which provides a reliable seal without unnecessary bulk where it isn’t needed and adequate protection where it matters most.

The important idea here is choosing laps that keep the exterior moisture barrier continuous while accounting for wind and movement. Edge laps are where one sheet overlaps the next along a wall edge, and these spots are typically flashed or sealed with tape, so a smaller overlap is sufficient and helps avoid bulk at the edge. End laps are where sheets butt end-to-end; these joints are more exposed to wind-driven water and expansion/contraction, so a larger overlap is used to ensure the joint stays covered and sheds water even if the sheets shift a bit. Therefore, the recommended practice is 2 inches at the edges and 6 inches at the ends, which provides a reliable seal without unnecessary bulk where it isn’t needed and adequate protection where it matters most.