Do Americans call it an attic?

Yes, Americans call it an attic, which is standard American English term for space under roof of house used for storage or converted to living space. In United States, attic is common word used in real estate listings, building codes, and everyday conversation to describe uppermost area between top ceiling and roof. Americans also use descriptive variations like finished attic for converted living space, unfinished attic for storage only, storage attic, floored attic, walk-up attic, and bonus room for finished attic used as bedroom or office. While British English often uses loft as common term for attic, Americans typically say attic rather than loft for residential house space, though loft is used for converted industrial spaces or modern attic conversions. So yes, attic is standard American term, understood everywhere in US, and used in both technical and casual contexts to refer to space under roof.