Ends of bottom bearing joists are normally laterally restrained by which method?

Ends of bottom bearing joists are normally laterally restrained by which method?

• A. Row of diagonal bridges over support
• B. 4-8d nails
• C. Solid blocking
• D. 3-8d nails

Answer: (C)

Lateral restraint means preventing sideways movement of the joist ends so the floor stays square and stiff under load. Solid blocking between adjacent joists right at the bearing area creates a rigid seat and ties the joists together, so the ends can't slide or twist. This direct, continuous support distributes load and keeps the end of each joist from moving laterally, which is more effective than relying on nails alone or on lighter bridging. Nails can loosen or fail to stop movement, while blocking provides a solid, long-lasting restraint that maintains floor alignment and serviceability.

Lateral restraint means preventing sideways movement of the joist ends so the floor stays square and stiff under load. Solid blocking between adjacent joists right at the bearing area creates a rigid seat and ties the joists together, so the ends can't slide or twist. This direct, continuous support distributes load and keeps the end of each joist from moving laterally, which is more effective than relying on nails alone or on lighter bridging. Nails can loosen or fail to stop movement, while blocking provides a solid, long-lasting restraint that maintains floor alignment and serviceability.