Horizontal Rafter Thrust

This Thrust Calculator gives rafter horizontal thrust at the plates
L= Rafter Span (building width)
w= Load on Rafter (roof design load)
s= Rafter Pitch
T= Horizontal Thrust (wL/4 x run/rise x on center spacing/12)

Rafter Span, Bldg Width (inches)
Load on Rafter (pounds/sq ft)
Pitch of Rafter (e.g. 6/12)
Rafter Spacing (inches)