6 & 8 Sided Polygon Rafter Tables
The Chappell Universal Square includes a comprehensive Polygon Rafter Tables available for the first time ever on a framing square. The patented tables include values for 6 & 8 sided polygons with common pitches from 2:12 to 18:12, to include:
- Common rafter length per unit of run.
- Difference in lengths of jack rafters per unit of spacing.
- Top cut of jack rafters.
- Length of Hip & Valley rafters per unit of common run.
- Difference in length of jack purlins per unit of spacing.
- Top cut of jack purlins.
- Sheathing angle offset per 1 unit.
- Depth of backing & bevel angles per unit of hip or valley width.
- Housing angle of purlin to hip or valley.
- Hip & Valley side layout angle to purlin header.
- Housing angle of hip or valley to principal (common rafter) and horizontal plate.
- Working plane top of hip or valley.
- Purlin/Frieze Side cut angle. Mitered fascia face layout angles.
- Hip & Valley backing angles.
- Jack rafter and purlin top cut saw angle.
- Fascia/Frieze miter saw cut angles.
Polygon Rafter Tables
Prior to the introduction of the Chappell Universal Square, builders would have to reach deep into their bag of tricks when faced with a Gazebo Project. Polygon Roof Systems are a totally different beast than even hip and valley systems. But no more fuss, and no more worries about landing your next Hexagonal or Octagonal gazebo project. The Polygon Rafter Tables on the Chappell Universal Square have got your back.
The Chappell Square puts this wealth of knowledge right in the palm of your hand, by providing 17 key rotational angles and length factors in the patented Polygon Rafter Tables. These include even the most complex and elusive Purlin/Frieze Side Cut and Facias Mitre Angles for 6 and 8 sided Polygon Roof Systems. No more dead-reckoning, no more head scratching, and no more permanent bald spot on the side of your head.
No Batteries, No Calculator Required
The only thing one needs to master polygonal roof framing—whether a pro or DYI— is a Chappell Universal Square, a pencil and a scrap piece of wood to scribble out simple math. Addition and multiplication. That’s it! The patented tables, deeply etched into the square, provide all the angular ratios that can be applied directly to the square, along with length and spacing ratios requiring only simple multiplication to determine common and hip member lengths, or jack purlin and jack rafter lengths and spacing reductions, and even the elusive Purlin Side Cut Angle. The straight forward base 10 system allows for easy math, simply scribbled on a scrap piece of wood, to transfer the factors in the Polygon Rafter Tables into member lengths and cut angles. It couldn’t be easier, and No frustrating fractions to convert, NO BATTERIES and NO CALCULATOR REQUIRED!
Find your peace-of-mind by adding a Chappell Square to your tool box, and get on with the work at hand—building your next project and future.
The Chappell Universal Square—Rebuilding America One Square at a Time.
Join the Revolution!
Visit the Chappell Square YOUTUBE Channel to see our series of instructional videos and see just how easy it is to use the Chappell Square.
Check out the EQUAL PITCHED RAFTER TABLES
Check out the UNEQUAL PITCHED RAFTER TABLES
Reviews from the Press
Never Sponsored Substack by Christopher Schwarz: The Chappell Universal Square
This Is Carpentry Review: The Chappell Square, A revolutionary approach to a commonly used tool
Home Fixated Review: Chappell Square Review – The Supercomputer of Framing Squares
JLC-Journal of Light Construction Review: Chappell Master Framer Square
SBE Builders by Sim Ayers: Chappell Master Framing Square Review