a. Spans are given in feet and inches. 

b. Table is based on a maximum roof-ceiling dead load of 15 psf. 

c. The header [may] be supported by an approved framing anchor attached to the full-height wall stud [...]in lieu of the required jack stud. 

d. The 20 psf ground snow load condition shall apply only when the roof pitch is 9:12 or greater [...] 

e. Building width is measured perpendicular to the ridge. For widths between those shown, spans [may] be interpolated. 

f. The header shall bear on a min. of one jack stud at each end.
a. Spans are given in feet and inches. b. Table is based on a maximum roof-ceiling dead load of 15 psf. c. The header [may] be supported by an approved framing anchor attached to the full-height wall stud [...]in lieu of the required jack stud. d. The 20 psf ground snow load condition shall apply only when the roof pitch is 9:12 or greater [...] e. Building width is measured perpendicular to the ridge. For widths between those shown, spans [may] be interpolated. f. The header shall bear on a min. of one jack stud at each end.

Q: What are the guidelines for letting rim joists act as headers in a wall system, and is there a way to insulate that header without sacrificing the bearing surface for the joists?

A: Mike Guertin, contractor and presenter at JLC Live, responds: With any framing situation, first determine whether you even need a header. Windows and doors in non-bearing exterior walls generally don’t require structural headers (other than 2x4s or 2x6s on the flat to frame the openings and cripples if the space between the flat header and...

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