Door Header Code
TABLE R602.7 (1) GIRDER SPANS a AND HEADER SPANS a FOR EXTERIOR BEARING WALLS (Maximum spans for Douglas fir-larch, hem-fir, Southern pine and spruce-pine-fir b and required number of jack studs). For header spans, see Tables R602.7 (1), R602.7 (2) and R602.7 (3). TABLE R602.7 (1) GIRDER SPANS a AND HEADER SPANS a FOR EXTERIOR BEARING WALLS (Maximum spans for Douglas fir-larch, hem-fir, Southern pine and spruce-pine-fir b and required number of jack studs).
2308.5.5.1 Openings in exterior bearing walls. Headers shall be provided over each opening in exterior bearing walls. The size and spans in Table 2308.4.1.1 (1) are permitted to be used for one- and two-family dwellings.
Headers for other buildings shall be designed in accordance with Section 2302.1, Item 1 or 2. This comprehensive code comprises all building, plumbing, mechanical, fuel gas and electrical requirements for one- and two-family dwellings and townhouses up to three stories. The 2021 IRC® contains many important changes such as: Braced wall lines must be placed on a physical wall or placed between multiple walls.
The rated separation for two. 13 International Residential Code 2012 Chapter 6 Wall Construction Section R602 Wood Wall Framing R602.7 Headers. For header spans see Tables R502.5 (1) and R502.5 (2).
So if you're on the top floor, you can use 2 2x4's (unless the building is 36' wide, in which case you'll need 2 2x6's). Free door header size calculator for 2x4, 2x6, 2x8 headers. Calculate exact sizes for any door width and load.
Determine the door header size based on span and load. Explore a searchable database of US construction and building code. Code regulations are consolidated by state and city for easier navigation.
Use this door header size calculator to find the correct lumber size for your door header or determine the maximum length that a piece of lumber for a door header can span.