What is the maximum threshold height allowed under ADA for new construction?
The maximum threshold height for new construction on accessible routes is 1/2 inch (13 mm). Any threshold higher than 1/4 inch must have beveled edges with a maximum slope of 1:2. For existing buildings undergoing renovation, the maximum is 3/4 inch with beveled edges.
What type of threshold should I use for an exterior commercial entry?
Exterior commercial entries typically require a saddle or bumper threshold with weather sealing. In climate-controlled buildings, a thermal break threshold reduces energy loss through the threshold. The threshold material should be corrosion-resistant (aluminum, bronze, or stainless steel) based on the environmental exposure.
Do I need a thermal break threshold?
Thermal break thresholds are required by energy codes in many climate zones for exterior openings in heated or cooled buildings. Check your local energy code (typically IECC or ASHRAE 90.1) and climate zone to determine whether a thermal break is mandatory. Even where not required by code, thermal break thresholds improve building envelope performance.
What threshold works with panic exit devices?
Panic (exit device) thresholds have a low-profile design that avoids interfering with the panic bar's operation or vertical rod mechanisms. These thresholds typically combine a flat or low saddle profile with an integrated seal. Pemko manufactures specific panic threshold profiles for this application.
Does CDF supply Pemko thresholds?
Yes. CDF Distributors supplies Pemko thresholds, in addition to other brands. Thresholds can be specified as part of a complete door assembly in CDF's ProBuilder configuration tool, which validates compatibility with the door, frame, and hardware.
Can a threshold affect the fire rating of an opening?
Yes. Fire-rated openings have specific requirements for the gap between the door bottom and the floor or threshold. The threshold must maintain the required clearance specified by the door and frame manufacturer's fire-rated listing. Using a non-listed threshold or creating excessive clearance can void the fire rating of the assembly.
