Frequently Asked Questions
What size header for a 3-foot door opening in a load-bearing wall?
A 3-foot opening (under 3.5 ft) with one floor above requires a doubled 2x6 header.
What header size for a 6-foot garage door opening?
A 6-foot opening (5 to 6.5 ft range) in a load-bearing wall with one floor above needs a doubled 2x10.
Do I need a header in a non-load-bearing wall?
Technically only a flat 2x4 or 2x6 on edge is needed. Most builders install a doubled 2x6 for consistency and future flexibility.
How long should a header be for a 36-inch rough opening?
Total header length = rough opening + 6 inches for bearing = 36 + 6 = 42 inches (3.5 ft). Cut two pieces of the recommended lumber size to this length.
How do I know if a wall is load-bearing?
Load-bearing walls run perpendicular to floor joists, sit above a beam or wall in the floor below, or are exterior walls. A wall parallel to joists with nothing below it is usually non-load-bearing. When in doubt, consult a structural engineer.
Can I use LVL for any opening width?
Yes. LVL (laminated veneer lumber) is a common upgrade for wide openings. Its higher Fb (typically 2,600 psi) allows shallower members or longer spans than sawn lumber. LVL headers must be sized by the manufacturer's span tables or an engineer.
Do I always need doubled headers?
Yes in wood-framed walls. The doubled header matches the 3-inch thickness of a 2x4 stud wall (two 1.5-inch pieces). A plywood spacer fills the remaining 0.5 inch in standard 2x4 framing.
What is the difference between a king stud and a jack stud?
The king stud is the full-height stud next to the opening. The jack stud (trimmer) is a shorter stud nailed to the king stud that supports the underside of the header. Together they form the rough opening sides.
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