with special cross-section, e.g. with corrugations on both sides, with ribs, flanges, or the like (E04D3/35 takes precedence)

Full Title

Roof covering by making use of flat or curved slabs or stiff sheets (E04D1/00 takes precedence; built-up roofs E04D11/02) > with special cross-section, e.g. with corrugations on both sides, with ribs, flanges, or the like (E04D3/35 takes precedence)

Child Classifications

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• E04D 3/26 of concrete or ceramics
• E04D 3/28 of glass
• E04D 3/30 of metal
• E04D 3/32 of plastics, fibrous materials, or asbestos cement
• E04D 3/34 of specified materials, or of combinations of materials, not covered by any one of groups E04D3/26 - E04D3/32