Door Header Wind Load Design

When hurricane winds push against a door, all that force travels up into the header beam. Watch how wind pressure transfers through the structure and learn to size headers that won't fail.

60+ PSF Pressure

2x12 Min Header

L/360 Deflection Limit

Wind Load Transfer Animation

HEADER BEAM

Wind Speed 0 mph

Pressure 0 PSF

Header Load 0 PLF

Understanding Header Loads

Think of a door header like a bridge - it spans the opening and carries weight from above while also resisting sideways wind forces.

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Wind Pressure

Hurricane winds create pressure that pushes on the door. In Palm Beach County, this can be 60+ pounds on every square foot of door surface.

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Load Transfer

The door frame takes the wind pressure and sends it up to the header. The header must be strong enough to bend that force sideways into the wall studs.

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Header Sizing

Wider doors need bigger headers. A 6-foot opening might need engineered LVL beams or steel, while a 3-foot door can use doubled 2x12 lumber.

Frequently Asked Questions

Common questions about door header wind load calculations.

What is a door header and why does it need wind load calculations?

A door header is the horizontal beam above a door opening that holds up the wall and roof above it. During a hurricane, wind pushes hard against doors, and all that force travels up into the header. If the header is too weak, it can bend or break, causing the wall to fail. In Palm Beach County, headers must handle wind pressures of 50+ PSF.

How do I calculate wind load on a door header?

Multiply the door width by the design pressure to get the load per foot of header. For example, a 3-foot wide door with 60 PSF pressure puts 180 pounds of force on each foot of header. The header must be sized to carry this load plus the weight of the wall above without bending more than L/360.

What size header do I need for a door in Palm Beach County?

For standard 3-foot doors in HVHZ zones, you typically need doubled 2x10 or 2x12 headers. Wider openings like 6-foot doors often require engineered lumber (LVL) or steel headers. The exact size depends on wind zone, door width, and building height.

Do impact-rated doors reduce header load requirements?

No, the header must still carry the same wind pressure whether the door is impact-rated or not. Impact doors prevent debris from breaking through, but wind still pushes against the entire door surface. That force transfers to the header regardless of door type.