Tim,

That's because the tiles are installed 3 thick, making the tiles raised 1/2"+ above the roof at an angle. Bending the tiles allows the butt end to lay flat against the tiles it overlaps.

Same thing which standard three tab shingles except that they are so thin, and the shingles so flexible, that the tabs lay flat by themselves.

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Jerry Peck, Construction / Litigation Consultant
Construction Litigation Consultants, LLC ( www.ConstructionLitigationConsultants.com )