Final answer:
Fireblocking 3 stringers of a stairway involves using noncombustible materials to prevent the spread of fire and smoke, typically by installing solid wood blocks between the stringers at intervals according to local building codes.
Step-by-step explanation:
Fireblocking is a crucial safety measure in construction that involves the placement of materials to prevent the spread of fire inside concealed spaces of a building. When it comes to properly fireblocking the 3 stringers of a stairway, it involves the use of noncombustible materials that can resist the passage of fire and smoke. The typical approach is to install solid blocks of wood, which can be 2x4s or 2x6s, cut to fit snugly between the stringers at intervals prescribed by your local building codes. These blocks should be fastened securely in place to ensure that they provide an effective barrier.
In some cases, depending on the local codes and the materials of the stringers and the surrounding structure, alternative fireblocking materials such as fire-resistant foam or caulk might also be acceptable. Always consult your local building codes and possibly a construction professional to ensure that your fireblocking technique meets the required safety standards. The installation procedure typically demands that you install blocks every 10 feet vertically and at every floor level for horizontal stringers, but again, your local building code may have specific requirements that differ slightly.