WRAP LOGIC FIELD GUIDE
Jacket layouts

45° bevel

The 45° watershed bevel where a bigger covering steps down to a smaller one. Enter the two ODs and cut the ring.

Inputs

From the Knauf chart, or type your own
From the Knauf chart, or type your own
0Inner radius (small radius × 1.414)
0Outer radius (large radius × 1.414)
0Cut inner circle (−¾")
0Cut outer circle (+¾")

Pattern, to scale

  1. Draw a right angle. Mark half the small OD both ways from the apex, and half the large OD both ways.
  2. Set dividers across the two small marks () and scribe a circle from the apex. Do the same across the large marks ().
  3. Add ¾" to the outer circle and take ¾" off the inner circle for notches or crimp.
  4. Add 1½" past the right angle along the outer circle and draw a line to the apex for the lap. Add ⅜" on the other side of the right angle for a safety edge.
  5. Cut out the ring with the right angle removed. Roll it slightly, notch or crimp the outside edge, and install to shed water.

Method: Advanced Metal Jacketing (IIIATF), Task C.2.1, 45° Bevel. Check the first piece on the job before cutting a batch.