Thresholds & Weatherstripping

Choosing a threshold

• Saddle thresholds are the standard choice. Match the width to the frame depth and the door.
• Thermal break thresholds limit heat transfer on exterior doors.
• Bumper thresholds have a built-in vinyl seal that the door bottom closes against.
• Ramps and ramp assemblies help where the floor and threshold levels differ.

Under the ADA, thresholds at accessible doors are generally limited to 1/2" high, with edges beveled. Common lengths are 36", 48", 72", 84" and 96", in mill finish or clear anodized aluminum.

Sealing the door

• Door sweeps and shoes seal the bottom gap. Shoes with a rain drip shed water on exterior doors.
• Automatic door bottoms drop a seal when the door closes, which suits acoustic and smoke openings.
• Perimeter gasketing seals the head and jambs. Choose neoprene, silicone, vinyl or brush inserts to suit the job.

Fire and smoke doors

Gasketing on fire-rated and smoke-rated openings must be listed for that use. Look for the fire and smoke seals in this collection, and see what voids a fire door label. For door and frame sizes, see how to measure a door and frame.