Here we have a wood framed gable roof.
Scissor beam roof.
The image below shows a cross section of our simple 12 x 13 house from the joist span tables section of this tutorial.
1 a truss with a tie beam.
1 a truss with an interrupted tie beam or scissor truss which allow a vaulted ceiling area.
Let s consider a basic gable wood roof framing design.
2 a roof system with a ceiling so the framing is not visible.
2 roof framing open to view not hidden by a ceiling.
They are a bit more expensive than king post trusses but give some height in the middle of the room.
Continuing on from part 3.
However designing a scissor truss goes beyond the aesthetics we also have to consider the structural engineering.
There is a hierarchy of timber framing at work here with trusses supporting the ridge and purlin beams.
Above these components is a rack of common rafters.
Beam scissor truss calculator posted on september 8 2020 by sandra scissors trusses and home performance design of timber structures roof building with a scissor truss can a scissor truss be designed for pricing wood trusses for any a.
Scissor trusses are made with double bottom chords that meet in the center of the truss and scissor together crossing over the king post and continuing onto the top chord.
Floor beam span tables of residential structural design we will now look at roof rafter and beam design.