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In general, the maximum span for a 4-by-6 beam is 6 feet between 4-by-4 posts. If you move up to 4-by-8, you're usually allowed to span up to 10 feet between posts. A 4-by-10 can usually span up to 12 feet between posts.How long can a LVL beam span?
For example, if you are using an LVL beam with two plies of 16 inches or three plies of 14 inches with the columns spaced 14 feet from one another, the maximum span size is 36 feet. This span size only applies to single floors; floors supporting additional stories or roofs require sturdier construction and use different LVL span size charts.What is the span of a wood beam?
A rectangular wood beam is to be designed to support first floor joists only (no bearing walls or other loads). The beam is to be simply supported at each end on support walls (2x4s). Clear span between stud walls is 14 feet. Span length is then 14.3 feet.