Garage door header size | 8', 9', 10', 12', 14', 16' & 18' garage door header size for 1 & 2-Car 

Garage door header size | 8', 9', 10', 12', 14', 16' & 18' garage door header size for 1 & 2-Car
The size of the header needed for a garage door opening depends on several factors, including the width of the opening, the load it needs to support (e.g., roof load, snow load), and local building codes. Here are some general guidelines:
Single Garage Door (8-10 feet wide): 2x10 or 2x12 dimensional lumber, or an engineered wood beam (like an LVL) may be sufficient. Example: For a 9-foot wide opening, a double 2x10 or 2x12 header is typically used.
Double Garage Door (16 feet wide): For wider openings, a more substantial header is necessary. Example: A 3-1/2"x11-7/8" an engineered beam like LVL (Laminated Veneer Lumber) would be appropriate.
Load Considerations: If the garage is supporting a significant roof load or is part of a two-story structure, the header may need to be larger or require additional engineering (like a steel I-beam or thicker LVL).
For an 8-foot wide opening, a double 2x12 dimensional header is typically used. For a 9-foot wide opening, a triple 2x12 dimensional header is typically used. For a 10-foot wide opening, a triple 2x12 dimensional header is typically used.
For a 12-foot wide opening, a 3-1/2"x9-1/4" LVL header is typically used. For a 14-foot wide opening, a 3-1/2"x9-1/2" LVL header is typically used. For a 16-foot wide opening, a 3-1/2"x11-7/8" LVL header is typically used. For a 18-foot wide opening, a 3-1/2"x18" LVL header is typically used.
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