Read exposure separately from size
Overall tile dimensions describe the piece in your hand; installed exposure describes the area it covers within the chosen arrangement. The two are not interchangeable. Product sheets such as Ludowici’s Americana reference list them separately. Ask the roofer to identify the exact product data used for the takeoff and course spacing, including any specialty pieces.
Check what actually arrived
Headlap depends on tile dimensions and placement. Manufacturing variation can affect the overlap achieved in the field. Ask how delivered tiles will be checked before repeating the layout. An older allowance for a particular sealed system is not permission to stretch any roof course. Retain the agreed layout as a site reference.
Resolve boundaries together
As a planning exercise, mark the eave, ridge, wall abutments and hip fittings on one roof plan. Identify where the last course lands and where cuts become visible. Specialty bonnet hips can impose their own slope and joint-layout requirements. Have the designer and roofer resolve those transitions before accepting a field pattern that cannot finish cleanly.
Agree on the appearance checkpoint
Request a representative starting area showing ordinary courses, an edge and the chosen decorative treatment. A boosted tile system has its own components and attachment details; it is not simply an arbitrary stack of extra tiles. Agree who reviews this area, what they are approving and when production can continue. Record changes before the rest of the roof is laid.
Related questions
Further reading & technical sources
- Americana 14-inch Interlocking Tile Product Data ↗
- Permissible Tile Headlap on Sealed Underlayment Systems ↗
- Flat Slab Tile — Section at Bonnet Hip ↗
- Boosted Capistrano Installation Guide ↗
Consult the current product documentation and local requirements for your project. These introductions are not installation specifications.
Tile Roofing USA editorial guide · Published October 26, 2026.