Demystifying the Building Code Dilemma for Unit Entry Doors

Building codes can be complex, especially when selecting the right locking mechanism for unit entry doors. Two common options are interconnected locks and a combination of a deadbolt and leverset.

Interconnected Locks

What Are They? Interconnected locks combine a deadbolt and a latch bolt into a single mechanism, allowing both to be operated simultaneously by turning the knob or lever from the inside.

Advantages:

• Ease of Egress: A single motion unlocks both the deadbolt and latch, making it easy for occupants to exit quickly in emergencies.
• Accessibility: These locks are ideal for meeting accessibility standards as they reduce the physical effort required to unlock the door.
• Compliance: Many building codes, particularly in multi-family housing, mandate the use of interconnected locks to ensure safe and efficient egress.

When to Use:

• Multi-Family Housing: Often required by codes for apartments and condos.
• Senior Living Facilities: Enhance accessibility for residents with limited mobility.
• Fire Safety Codes: In buildings where rapid egress is a priority.

Deadbolt and Leverset Combination

What Are They? This setup involves a separate deadbolt and a lever or knob set, requiring two distinct actions to unlock the door.

Advantages:

• Security: The separate deadbolt adds an extra layer of protection, making forced entry more difficult.
• Flexibility: Users can lock the deadbolt without engaging the latch, offering more control over access.
• Aesthetic Versatility: More design options are available to match the door hardware with the overall decor.

When to Use:

• Single-Family Homes: Where the additional security feature of a deadbolt is desired.
• Commercial Properties: In scenarios where enhanced security is paramount.
• Customization: When specific aesthetic or functional requirements must be met.

Building Codes Governing the Use of Interconnected Locks:

• International Building Code (IBC): Ensures safe and efficient egress in multi-family housing.
• International Residential Code (IRC): Enhances accessibility and safety in one-and two-family dwellings.
• Local Building Codes: Specific requirements may vary by region.

Notable State Building Code Differences Governing the Use of Interconnected Locks:

• California: The California Building Code (CBC) and California Residential Code (CRC) have specific requirements for interconnected locks in multi-family housing and senior living facilities to ensure ease of egress and accessibility.
• Florida: The Florida Building Code (FBC) also mandates the use of interconnected locks in certain types of residential buildings to comply with accessibility and safety standards.
• New York: The New York State Building Code includes provisions for interconnected locks in multi-family dwellings and other buildings where rapid egress is critical.

Key Takeaways

Choosing between an interconnected lock and a deadbolt and leverset combination depends on the building's requirements and its occupants. Interconnected locks are preferred for accessibility and compliance in multi-family and senior living facilities, while deadbolt and leverset combinations offer superior security and customization for single-family homes and commercial properties. Understanding specific building codes and requirements in your jurisdiction is essential for selecting the right locking solution.