Metal Roofing Pattern Library

Metal Roofing Pattern Library

Chapter 3: Roof geometry, pattern making <

Folds are like knots.  There are many different folds each suited for a specific type of seam intersection or scenario that may be required to join the sheets.  Since we use standard ratios for roof framing, we can plot the patterns for these given details knowing only the type of detail we want to create, and the pitch of the roof it is being installed on.  

Lay Down Folds:

Lay down folds are the building blocks of seamed roofing, the first to learn, and the simplest to construct.  You will find lay-down folds in some historic american roofing on hips, ridges, and valleys.

  1. Hip folds
  2. Valley folds
  3. Ridges
  4. Curbs 


Pinched folds: 

Pinched folds are the first class of folds to require a “pocket” or “pleat” to create the seam.  This is similar to origami folding.  With a pinched fold, we can intersect two seams without having to lay down one of the connecting seams.

  1. Standing Ridge / Verges
  2. Deck intersections: 3-way
  3. Deck intersections: 4-way
  4. Prism intersections: 3-way
  5. Prism intersections: 4-way
  6. Standing hip
  7. Low back wall counter flashing


Upstands allow us to cary the standing seam through a roof-to-wall, pitch change, or any other inside detail:

  1. Pinched seam upstand
  2. Sweep upstand

Eave gutters, spilways, and complex shapes:

There are many other complex shapes that require hands-on instruction or careful self-study to master.  Check the blog for great new copper roof, metal roof, and metalworking videos.  As always if you need one-on-one technical support, trad roofing is always available for consulting and custom pattern work for your permanent metal roof.

Chapter 3: Roof geometry, pattern making

Metal Roofing Bible