When a storm rolls through, your garage door is one of the largest and most vulnerable openings in your home. A door that isn't rated for local wind conditions can fail under pressure, leading to structural damage, safety hazards, and costly repairs. That's where WindCode® comes in.
WindCode® is a wind load rating system developed by Clopay (following industry testing standards set by DASMA) that classifies garage doors based on their ability to withstand specific wind pressures. Each WindCode® rating, ranging from W1 through W9, corresponds to a range of design wind pressures, which are measured in pounds per square foot (PSF). The higher the pressures, the stronger the door's resistance to wind forces.
All building codes require wind-rated garage doors. Understanding your required WindCode® rating is essential. Clopay's free residential WindCode® calculator takes the guesswork out of the process. By entering the required details about your location and door, you'll receive the recommended design pressures (Positive and Negative PSF) tailored to your specific home or building. Of course, local building codes vary widely, so always consult your local building authority or a licensed contractor to confirm compliance requirements in your area.
To determine your specific design pressure requirements, you will enter the specific building data into the calculator. Follow these steps to make sure you get accurate results:
Step 1: Select Your Current Building Code
Select the building code enforced in your area (such as IBC/IRC, Florida Building Code or TDI). This sets the baseline for how wind loads are calculated for your specific structure. (inspecttoprotect.org)
Step 2: Determine Your Design Wind Speed (MPH)
Enter the required wind speed for your location. If you are unsure, use a resource like the ASCE Hazard Tool (ascehazardtool.org) to look up the exact MPH requirements for your specific address, as these can vary even within the same county.
Step 3: Choose Your Exposure Category
This refers to how exposed your property is to wind. Select the category that best describes the environment around your home:
- Exposure B: Suburban or wooded areas with natural wind breaks
- Exposure C: Open terrain with few obstructions (rural land, open fields)
- Exposure D: Coastal areas and shorelines with the highest wind exposure
Step 4: Enter your elevation above sea level.
Step 5: Enter your Building Information
Enter the physical dimensions of your home. You’ll need to provide:
- Building Dimensions: Enter the overall Length and Width of the structure.
- Mean Roof Height: The average height of your roof (halfway between the eave and the peak).
- Roof Angle: For steep or pitched roofs greater than 2:12 pitch, update this field to >=10 degrees.
- Enclosure Classification: Most buildings are classified as “Enclosed”. If yours is not, please update to Partially Closed or Partially Open
Step 6: Door Information
- Enter your Opening Width and your Opening Height
- Door Location: Enter the distance from the edge of the garage door to the nearest corner of the building, as wind pressure is higher near the corner.
Step 7: Submit and Review
Once all fields are filled in, click "Calculate" to receive your recommended pressure requirements in PSF.
Tips for Accurate Input:
- Verify your local wind speed (MPH) through a professional map (ASCE hazard tool) or your local building department before starting. If you're unsure of your exposure category, consult a local Clopay dealer.
- Measure your garage door opening carefully before entering dimensions. Even a few inches can affect which door models meet the required rating.
- Measure the distance from your door to the building corner; wind forces “vortex” at corners are higher than other parts of the walls; therefore, this dimension is important.
After using the calculator, you'll receive a WindCode® rating, typically expressed as W1 through W9, along with a design wind pressure value in PSF. These values represent typical pressure ranges associated with Clopay® W-levels, however there can be variations, so make sure to verify the exact design pressure for the specific model and size
- W1 = +/- 12.5-16.5 PSF
- W2 = +/- 15.5-19.0 PSF
- W3 = +/- 20.0-21.0 PSF
- W4 = +/- 25.0-29.0 PSF
- W5 = +/- 30.0-33.0 PSF
- W6 = +/- 36.0-42.0 PSF
- W7 = +/- 42.0-48.0 PSF
- W8 = +/- 46.0-62.0 PSF
- W9 = +/- 62.0-72.0 PSF
A lower rating doesn't mean a weaker door overall. It simply means that door has been tested and certified to withstand the specific pressures typical of lower-wind areas. What matters is matching the door to your location's requirements.
Even the highest-rated garage door will underperform if it isn't installed correctly.
Professional installation ensures:
- Proper anchoring: The door frame and track must be securely anchored to the structural framing of the garage. Improper anchoring is one of the most common reasons doors fail during storms.
- Correct spring tension: The spring system must be calibrated to the exact weight and size of the door. An improperly tensioned system puts uneven stress on the panels and hardware.
- Compliance verification: A certified installer will confirm that all components are configured to meet the required WindCode® rating for your area.
- Code documentation: A permit may be required for garage door installation. A professional installer will handle permitting and ensure the installation passes inspection.
It is imperative to make sure your door is installed in accordance with all Clopay instructions and per the correct, corresponding wind tested installation drawing for your door model and size. Your local Clopay dealer can assist you with these requirements.
To find a certified Clopay dealer and installer near you, use Clopay’s dealer locator. Our network of trained professionals can assess your home, confirm your WindCode® requirements, and complete a compliant installation.
A wind-rated garage door requires the same routine care as any garage door, but with a few additional considerations given the performance expectations placed on the system.
Regular Inspection Checklist
- Check hardware annually: Inspect hinges, rollers, brackets, and track fasteners for signs of wear, rust, or loosening. Tighten any loose bolts and replace worn components.
- Test the door balance: Disconnect the opener and manually lift the door halfway. It should stay in place without assistance. An unbalanced door puts excessive strain on the spring system and may not perform correctly in high-wind conditions.
- Lubricate moving parts: Apply a silicone-based lubricant to hinges, rollers, and the spring system twice per year to reduce friction and extend component life.
- Inspect weather seals: The bottom seal and side seals help prevent wind-driven rain from entering the garage. Replace damaged seals to maintain a tight barrier.
- Examine struts and reinforcements: For WindCode®-rated doors, visually inspect internal struts for dents, bends, or corrosion, particularly after significant storm events.
Preventing Wind Damage
- Never leave the garage door partially open during a storm. A partially open door is far more vulnerable to wind pressure than a fully closed one.
- If your area is under a hurricane or severe storm warning, confirm the door is fully closed and locked before the storm arrives.
- After any major weather event, inspect the door and hardware before resuming normal operation.
What is a WindCode® rating?
WindCode® is a proprietary wind load rating system developed by Clopay to help consumers identify garage doors that meet local building codes. Clopay classifies these doors on a scale ranging from W1 through W9, with each rating corresponding to a specific design wind pressure measured in pounds per square foot (PSF). The higher the rating, the stronger the door's resistance to wind forces.
Do I need a WindCode®-rated garage door?
Yes. Typically, sectional doors are part of an exterior wall. Therefore, your door must be rated to meet the same building code and wind levels as your wall system. Use Clopay's WindCode® calculator to determine the rating required for your address and always verify with your local building department.
Is WindCode® the same as impact resistance?
No. WindCode® measures a door's ability to withstand wind pressure loads. Impact resistance refers to protection against windborne debris penetration. Some jurisdictions — particularly in Florida — require both. Clopay offers doors that meet combined wind pressure and impact standards.
Does professional installation affect my WindCode® compliance?
Yes. Professional installation by a trained Clopay dealer ensures proper anchoring, hardware configuration, and code documentation.
Don't leave your home's largest opening to chance. Use Clopay's free residential WindCode® calculator to find your required rating, then browse our full line of wind-rated garage doors to find the right fit for your home.
When you're ready to move forward, find a Clopay dealer near you for a personalized consultation and installation quote. Our dealers can also help you explore wind-resistant hardware upgrades, impact-rated door options, and other accessories designed to protect your home in severe weather.
