SBE Builders

Strong Built Establishments Builders

SBE Builders is a commercial and residential framing contractor located in Discovery Bay California. Dedicated to the art of Carpentery & Roof Framing. We are the professionals for the future of the craft of carpentry.

Chappell Master Framing Square Review
The only Stainless Steel framing square Made in USA
Chappell Universal Square & Rule Company
48 page instruction booklet at FoxMaple
Purchase the Chappell Master Framing Square at Chappell Universal Square & Rule Company
Purchase the Chappell Master Framing Square at FoxMaple

Framing Square with Crown Molding Miter Angle and Bevel Angle Settings

The only roof framing square with Polygon Rafter Tables for 6 and 8 Sided Polygons. Complete rafter tables for Hexagon and Octagon rafters. It includes the hip rafter angle, hip rafter backing angle, fascia miter and saw blade bevel angles for square hung fascia. As well as the frieze block / bird block / purlin miter and saw blade bevel angles.

The Trigonometric Properties imprint will help bring all framers into the 21st century and will make a great teaching tool.

The information printed on the Chappell Master Framing Square makes the CMC look like an apprentice roof framing calculator. It includes the hip rafter backing angle, fascia miter and saw blade bevel angles for square hung fascia for unequal pitched roofs. As well as the frieze block / bird block / purlin miter and saw blade bevel angles for unequal pitched roofs.

It's hard to write anything about the Chappell Master Framing Square without making it sound like hype for the product. I have four Construction Master Calculators, but it'll take the CMC another 20 years before they add the hip rafter backing angle to their calculators and another 20 years after that to add polygon rafter functions to their calculator. Maybe by 2100 they'll add dormer layover cuts to their calculator. Calculated Industries, Inc. is based in Carson City, NV. So why doesn't it have a frieze block miter and bevel function. I don't need a calculator for Real Estate & Mortgage loans. I need the Construction Master Calculator to find the angles in a complex roof system.

I have eight framing squares, including the Stainless Steel Shinwa. When was the last time anyone used the information printed on a framing square to cut a complex roof? With the information printed on the Chappell Master Framing Square it makes the information printed on the framing square relevant again. I would have never inmagine a framing square with dormer layover miter and saw blade bevels angles imprinted on the framing square. So my hats off to the Chappell Universal Square & Rule Company for adding this information to their Chappell Master Framing Square.

Some of the information printed on the Chappell Master Framing Square is the tangent of the angle.

Press [CONV] [TAN] on the CMC to see the inverse of the tangent angle in degrees.


  Using the Equal Pitch Rafter Table on the Chappell Master Framing Square for Stick Framing A Conventional Rafter Roof
 

Line 1 on the Equal Pitch Rafter Table is the common rafter length per inch of common run. In this 8:12 example, using a common rafter run of 96", we multiply 96" x 1.202 = 115.392" = common rafter length for the common rafter run of 96".
Line 2 on the Equal Pitch Rafter Table is the hip rafter length per inch of common run. In this 8:12 example, using a common rafter run of 96", we multiply 96" x 1.563 = 150.048" = hip rafter length for the common rafter run of 96".
Line 3 on the Equal Pitch Rafter Table is the tangent of P2-- Jack Rafter Side Cut Angle or the length of purlins (roof sheathing). In this 8:12 example, using a 48" wide piece of plywood we multiply 48" x .8321 = 39.9408". Measure off 39.9408" along the top side of the plywood to mark the plywood roof sheathing offset cut line. To find the Jack Rafter Side Cut Angle enter 0.8321 in the CMC and press [CONV][TAN] for the Jack Rafter Side Cut Angle in degrees, 39.76384.
Line 4 on the Equal Pitch Rafter Table is the tangent of C5-- Hip Rafter Backing Angle. Using the value on line 4 we can mark off half of the hip rafter width x .4264 for the depth of the hip rafter backing plane line. Or enter 0.4264 in the CMC and press [CONV][TAN] for the Hip Rafter Saw Blade Backing Bevel Angle in degrees, 23.0934.
Line 5 on the Equal Pitch Rafter Table is the tangent of R2-- Square Tail Fascia Saw Miter Angle on the Hip or Valley Rafter. Or the purlin housing angle on a hip or valley. Enter 0.3264 in the CMC and press [CONV][TAN] for the Square Tail Fascia Saw Miter Angle on the Hip or Valley Rafter in degrees, 18.07668.
Line 6 on the Equal Pitch Rafter Table is the tangent of R5-- Hip Rafter Diamond Post Miter Angle. Or the Housing angle of the Hip or Valley to Principal Rafter. Or the Hip Rafter Mortise Layout Angle on the Ridge. Enter 0.3333 in the CMC and press [CONV][TAN] for the Hip Rafter Diamond Post Miter Angle in degrees, 18.43323.
Line 7 on the Equal Pitch Rafter Table is the tangent of R4-- Hip or Valley Rafter Side Cut Angle. Enter 0.9045 in the CMC and press [CONV][TAN] for the Hip - Valley Rafter Side Cut Angle in degrees, 42.12934.
Line 8 on the Equal Pitch Rafter Table is the tangent of P1-- Purlin/Square Hung Fascia/Frieze Block Miter Angle set perpendicular to the plane of the roof. Enter 0.5547 in the CMC and press [CONV][TAN] for the Purlin/Square Hung Fascia/Frieze Block Miter Angle in degrees, 29.01713.
Line 9 on the Equal Pitch Rafter Table are the C5 - Hip-Valley Rafter Backing Angle in degrees and the Saw Blade Bevel Angle for C1-- Purlin/Square Hung Fascia/Frieze Block Saw Blade Bevel Angle set perpendicular to the plane of the roof.


Hip Rafter Diamond Post Saw Miter Angle = arctan (tan Hip Pitch Angle x cos Plan Angle)
Hip Rafter Diamond Post Saw Blade Bevel Angle = arctan (sin Hip Rafter Diamond Post Saw Miter Angle tan Plan Angle)


 
 

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SBE Builders
SBE Builders
5305 Laguna Ct.
Discovery Bay, California 94505
(925) 634-6022 • Fax: (925) 634-6022
Commercial & Residential Framing Contractor
Build it Green Framing Contractor
American Carpenter and Builder
California Licensed General Building Contractor
CA LIC.#  546126
Expert Witness for Construction Structural defects


Roof Framing Geometry

  • Roof framing geometry is empirical-type knowledge.
  • Information gained by means of observation, experience, or experiment.
  • From ground Line 0: Z1, Z2, Z3 etc...
  • To Roof Axis 0: A1, A2, A3 etc...
  • To the bring back line 0 for scribing: B1, B2, B3 etc...

Roof Framing Geometry Blog

Rafter Tools for Android
With Quad Tetrahedra Analytic Algorithm Technology.
Helping apprentice carpenters on their journey to becoming master carpenters with Certification in roof framing.

Rafter Tools+ for iPhone

Rafter Tools+ is a rafter calculator for complex roof framing angles that other roof framing calculators don't offer.

RafterTools+

Crown Molding Tools
crownmoldingtools.com

Crown Molding Tools  

Carpenters Of Steel

Canadian & American Geometric Roof Framing Development
using a Steel Framing Square

Geometric Roof Framing Development for Irregular Hip Roof Calculations
using a Steel Framing Square

Geometric Development of Tetrahedron
using a Steel Framing Square

Hip Rafter Backing Bevel Angles from 1565 to 2013

Applied Geometry and Euclidean GeometryA lesson in Applied Geometry and Euclidean Geometry

This Is Carpentry

We're a member of the Timber Framers Guild

Timber Framers Guild

American College of the Building Arts, carpentry and timber framing programs.

American College of the Building Arts

Would you like to have the knowledge and abilities to build a real Master Piece"
Patrick Moore is currently offering courses on 'L'Art du Trait'.

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