Wind-Rated Garage Doors in North Carolina: Zones and Code
Wind-rated garage doors are labeled with their pressure rating in psf. The label states positive and negative pressure. The 2018 NC Residential Code sets design wind speeds from 115 mph inland to 150 mph on parts of the coast, and DASMA TDS 155h converts speed to pressure: a 16x7 door at 150 mph needs +16.7/-18.6 psf. Here is how to find your county's zone and the rated door it calls for.
What is a wind-rated garage door?
A wind-rated garage door is a door built and labeled to resist a stated design pressure, in pounds per square foot, pushing in and pulling out. Manufacturers reach the rating with struts, heavier hinges, specified rollers and extra track brackets shown on a wind-load drawing.
The pressure comes from the county’s design wind speed, the roof height and the exposure of the site. On the coast, a new garage door replacement is ordered to the county’s pressure, not to the old door’s. A strut is a horizontal steel reinforcement across a section, and it is the main way manufacturers reach a rating.
Which building code sets garage door wind loads in North Carolina?
The 2018 North Carolina Residential Code sets garage door wind loads, and it remains in force because the 2024 code has been delayed with no effective date set. Its Table R301.2(4) assigns each county an ultimate design wind speed.
- Code in force
- 2018 NC Residential Code
- 2024 code
- Delayed by state law; the earliest possible effective date is May 1, 2027, and none is set (NC Licensing Board, June 1, 2026)
- Wind speed table
- Table R301.2(4), by county
At 130 mph or more, the code sends design to a high-wind path: ASCE 7, ICC 600, the Wood Frame Construction Manual, the International Building Code or Chapters 45 and 46 of the residential code.
What wind speed zone is my North Carolina county in?
Most North Carolina counties are 115 mph zones; the rated zones rise to 120, 130, 140 and 150 mph toward the coast, with Carteret County entirely at 150 mph. Twelve mountain counties fall under a special wind region set by elevation.
| Design wind speed (2018 NCRC) | Whole counties | Split counties (boundary per code footnote) |
|---|---|---|
| 150 mph | Carteret | Brunswick east of US 17 and Bald Head Island; New Hanover east of US 17; Onslow east of the Intracoastal Waterway (ICW); Pender east of the ICW |
| 140 mph | Craven, Jones, Pamlico, Columbus | Brunswick and New Hanover west of US 17; Onslow between US 17 and the ICW; Pender, Topsail Township, west of the ICW; Bladen east of US 701; Dare and Hyde east of US 264 |
| 130 mph | Beaufort, Camden, Chowan, Currituck, Duplin, Greene, Lenoir, Pasquotank, Perquimans, Pitt, Robeson, Sampson, Tyrrell, Washington, Wayne | Onslow west of US 17; the rest of Pender; Bladen west of US 701; Dare and Hyde west of US 264; Bertie and Martin east of US 17; Cumberland east of I-95 |
| 120 mph | Gates, Harnett, Hoke, Johnston, Richmond, Scotland, Wilson | Bertie and Martin west of US 17; Cumberland west of I-95 |
| Special mountain region (by elevation, Table R301.2(5)) | Alleghany, Ashe, Avery, Buncombe, Graham, Haywood, Jackson, Madison, Mitchell, Swain, Watauga, Yancey | None |
| 115 mph | Every county not listed above, such as Mecklenburg, Wake, Guilford, Forsyth and Durham | None |
What wind load does a garage door need in NC?
A 16×7 garage door on a one-story NC home needs +16.7/-18.6 psf at 150 mph, +14.5/-16.2 psf at 140 mph and +12.5/-13.9 psf at 130 mph, per DASMA TDS 155h. Open coastal exposure raises these by 49 to 81 percent.
| Wind speed | 9×7 single door | 16×7 double door |
|---|---|---|
| 120 mph | +11.1 / -12.6 | +10.7 / -11.9 |
| 130 mph | +13.1 / -14.8 | +12.5 / -13.9 |
| 140 mph | +15.2 / -17.1 | +14.5 / -16.2 |
| 150 mph | +17.4 / -19.7 | +16.7 / -18.6 |
DASMA permits interpolation: 115 mph falls between the 110 and 120 mph columns of TDS 155h. Multiply by 1.49 for Exposure C (open terrain) or 1.81 for Exposure D (open water) at a 15 ft roof. Two-story homes at 25 ft use higher values. The table assumes ASCE 7-16, ASD values and a 9.6 psf minimum, and doors over 100 square feet use the 16×7 row.
The NC Office of State Fire Marshal’s March 20, 2019 interpretation allows TDS 155h to set alternate garage door design pressures. The code’s prescriptive Table R4502(b) is the other route: 25, 29 and 32 psf at 140 mph, and 30, 35 and 39 psf at 150 mph, for roof heights of 15, 25 and 35 feet. Doors are tested to ANSI/DASMA 108 or ASTM E330, which hold each direction for 10 seconds at design pressure and 10 seconds at 1.5 times it.
How do I read a garage door wind load label?
A wind load label lists the door’s positive and negative design pressures, any impact rating, the wind-load drawing number and an approval number. Inspectors compare the installed struts, hinges, rollers and track brackets against that drawing, not the label alone.
Design pressure
The positive and negative psf the door resists.
Impact rating
The test result for windborne debris, where the door carries one.
Drawing number
The wind-load drawing that specifies struts, hinges, rollers and track brackets.
Approval number
The code approval reference for the assembly.
Model or manufacturing code
The identifier that ties the label to the door.
- Impact rating
- ANSI/DASMA 115 tests door glazing for impact (TDS 168); it applies only where the code designates a windborne debris region.
- Flood zones
- Table R4502(b) has an exception for ground-level doors below piling tops, built with breakaway design (20 psf or less) or opening provisions.
DASMA’s Technical Data Sheet 181 describes the inspection: reinforcement, stiles, hinges, rollers, track brackets and jamb fasteners are checked against the drawing.
Do I need a permit to replace a garage door in North Carolina?
No building permit is needed to replace a garage door in a North Carolina single-family home when the work costs $40,000 or less, under G.S. 160D-1110(c). The new door must still meet the county’s wind rating, and widening the opening needs a permit.
A door replacement is not load-bearing work. Widening an opening changes the header, which is structural, so that job goes through the building department.
What is garage door bracing for hurricanes?
Garage door bracing is manufacturer-specified reinforcement, horizontal struts or removable vertical posts, that stops the door from bowing and lifting out of its track under wind pressure. Aftermarket or homemade braces are not part of a tested rating.
Wind pushes on the face of the door, and the backward tilt of the vertical track then lifts the door, as DASMA’s Technical Data Sheet 192 and the investigations after Hurricane Andrew describe. Hurricane season runs June 1 to November 30, with a peak around September 10, according to NOAA’s National Hurricane Center. DASMA’s storm preparation for a rated door has four steps.
Close
Close the door and leave it closed.
Engage
Engage the manual lock on a rated door that has one.
Disconnect
Disconnect the opener while the door is locked.
Unlock
Unlock the door before the opener runs again.
Do not park a car against the door or add homemade bracing; the extra weight overloads springs and track (DASMA TDS 152).
When to call a technician about a wind-rated door
A rating is a property of the whole installed door, so the next step is the installer’s. Call a technician to replace a non-rated door on the coast, to confirm an existing door matches its wind-load drawing, or after a storm bends a strut, track or section. Struts and tracks tie into spring-tensioned hardware.
Reinforcement adds struts and hardware, one of the factors on the new garage door cost page. Technicians handle garage door repair and installation across North Carolina, from 115 mph Piedmont counties to the 150 mph coast.
The price comes first; the rated door follows your go-ahead. Call by 12 pm, Monday to Saturday, for a same-day inspection visit; trip fees are not part of our pricing.
Call (833) 752-1196 or request a quote for a rated door online.