Scissor Beam Roof

2 roof framing open to view not hidden by a ceiling.

Scissor beam roof.

1 a truss with an interrupted tie beam or scissor truss which allow a vaulted ceiling area. Floor beam span tables of residential structural design we will now look at roof rafter and beam design. A timber frame truss roof with ridge beam purlins and common rafters is a stunning combination that creates visual interest and structural complexity. Let s consider a basic gable wood roof framing design.

The image below shows a cross section of our simple 12 x 13 house from the joist span tables section of this tutorial. There is a hierarchy of timber framing at work here with trusses supporting the ridge and purlin beams. This means the size of the beams based on the woods species the span roof pitch and the job site location. However designing a scissor truss goes beyond the aesthetics we also have to consider the structural engineering.

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. Above these components is a rack of common rafters. 2 a roof system with a ceiling so the framing is not visible. Scissor trusses tend to spread a little when they are loaded.

1 a truss with a tie beam. 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.