What materials are considered noncombustible when constructing a fireplace?

The choice of tile and brick as noncombustible materials is correct because these materials are specifically recognized for their ability to withstand high temperatures without igniting or contributing to the spread of fire. Tile, which can be made from materials like ceramic, porcelain, or stone, has a high melting point and does not burn. Similarly, brick is made from clay that is fired at high temperatures, providing excellent fire resistance characteristics.

In fireplace construction, it is essential to use noncombustible materials in order to prevent fire hazards and ensure the safety and longevity of the structure. Noncombustible materials help to insulate and contain heat, allowing for safe operation.

The other materials listed in the other options are classified as combustible. Drywall, for example, can off-gas when heated, while wood and plaster on wood can easily ignite, and vinyl siding is made of plastic which can melt or burn easily. Therefore, these materials do not provide the necessary fire resistance needed in fireplace construction.