Why test for debris penetration with a 15 pound 2×4?
Post storm research has concluded that the most common debris falls within this size and weight in a residential area. Unlike a brick or roof tile, a 2×4 will “fly” for long distances and will not disintegrate at impact. This allows for a great amount of pressure to be placed onto the shelter surface in a small 1½” x 3½” surface area. Compared to bricks, lumber, rebar, plywood or other construction material, the 15 pound 2×4 is considered to be the best performance indicator of a shelters ability to resist impact.
