Ridge tiles that form part of the roofing system and are designed to cap the roof ridge typically classify with roofing tiles (690510). Purely decorative finials or ornamental pieces that do not serve a primary weatherproofing function are more likely to fall under the architectural ornaments subheading (690590). The article's structural role on the building is the key classification criterion.

Ceramic chimney liners are industrial construction materials and do not trigger mandatory admissibility review by a regulatory agency. Standard CBP entry documentation applies. However, importers should verify that products meet applicable ASTM or UL standards required by US building codes, as compliance is a commercial and liability matter separate from customs clearance.