Many roof objects are usually slanted at a 45-degree angle. The huge variety of available roof objects include roof?? (4x4x4 base model), roof??m (4x4x8 medium), roofel?? (4x4x4 left end piece), roofer?? (4x4x4 right end piece), roofhr?? (4x4x8 right hip piece) and roofhl?? (4x4x8 left hip piece), with the "?" here representing a wildcard character, plus many more. Note that WALKs and FLOORs as well as many ground cover objects are also useful as flat roof or ceiling pieces.
The following special objects in this category are restricted for use only by citizens who have been given the "Special Objects" privilege by the world's caretaker: