What is the starting method for the second course of three-tab shingles?

The starting method for the second course of three-tab shingles involves using a strip with one tab cut away. This technique is essential for achieving proper alignment and ensuring that the shingles overlap correctly. By cutting away one tab, you create a staggered pattern that enhances the roof's aesthetic appeal and improves its ability to shed water effectively.

Using a strip with one tab removed allows for better water drainage and reduces the chances of leak formation at the seams. This staggered arrangement also helps in preventing wind uplift, as the offset creates a more secure fit for each shingle against the previous course.

In contrast, starting with a full strip would create a misalignment in the courses, leaving exposed areas and potentially increasing the risk of water infiltration. A half strip would not provide the needed shingle coverage and could lead to inadequate flashing protection at the roof edges. Finally, a full tab would create a uniform look that does not achieve the staggered effect required for optimal performance and durability in a shingle roof layout.