Fire stop blocks are materials used in construction to prevent the spread of fire, smoke, and heat between different areas of a building. They are typically made from non-combustible materials and are installed in walls, floors, and ceilings where there are openings for pipes, cables, or ducts. These blocks help maintain the integrity of fire-rated assemblies, ensuring that fire does not easily pass through these openings. By effectively sealing gaps, fire stop blocks contribute to the overall safety of a structure, providing crucial time for occupants to evacuate in case of a fire emergency.