Plum City, Wisconsin

Wisconsin adopts the 2010 ADA Standards. Automatic doors at public entries need activation devices within 10 inches of the door frame, activation force no greater than 5 pounds for sliding doors, and closing speed adjusted to 5 seconds minimum for full-swing doors. I've seen Plum City retail doors fail inspection because the operator slowed too fast after a freeze. We set the logic card to hold open 5.5 seconds — that's Wisconsin code for storefronts.

Most LCN and Norton closers are rated to -20°F, but at -10°F the hydraulic fluid thickens — latch speed drops to zero on some models. That's when a door doesn't close fully and the sweeps freeze to the threshold. EPDM seals compress and don't rebound after repeated subzero cycles. In Plum City, we see aluminum thresholds expand and contract with the freeze-thaw, cracking the anchoring bolts. Every fall I recommend adjusting sweep speed to compensate for winter viscosity.

Dock doors in a Plum City grain facility see 50+ cycles per day. Follow the DASMA 108 standard: lubricate bearings and springs quarterly with a dry PTFE spray, inspect cables for wear every 3 months, and check balance every 6 months. For storefront doors at 10–20 cycles per day, adjust closer speed during spring and fall temperature swings. Replace threshold seals every 2–3 years — that's half the life you'd get in a climate without freeze-thaw.

If the frame is rusted through or the floor's pitched more than 1/4 inch over the threshold, a new door is the fix. I've replaced doors at Plum City's municipal building because the steel jamb had expanded from moisture and the fire label had delaminated. Springs that have cycled past 15,000 on a 10-cycle-per-day door are due for replacement, not repair. And if your door no longer meets current code — like missing a required fire label for insurance — you're looking at replacement, not patching.