## Thursday, June 12, 2014

### Rake Crown Mouldings with No Transitions

Crown Moulding Tools help file for Rake Crown Moulding with no Transition pieces. Sloped ceilings with rake crown moulding with transition pieces looks good, however a sloped ceiling with rake crown moulding with no transition pieces looks even better.

Crown Molding Tools for Android

Crown Molding Tools for Android has been updated with 6 new calculators. Installing rake crown moulding is complex, but these calculators will hopefully simplify the task.
1. Calculate Horizontal to Rake Wall No Transitions
2. Calculate Rake Wall To Horizontal at Corner Wall No Transitions
3. Calculate Rake Crown to Rake Crown No Transitions
4. Calculate Rake To Level No Transitions
5. Calculate Rake To Level Return No Transitions
6. Calculate Rake To Rake at Peak No Transitions

These pictures were taken at The Moulding Company  in Concord California. The rake crown mouldings were installed by Christian Murtha.

For rake ceiling crown moulding with no transitions, you have to roll the crown moulding to a different spring angle for the length of the crown moulding miter cuts to be the same length. The crown moulding positioned on the lower horizontal wall will be set at the spring angle of the crown moulding. The shallower the spring angle of the crown moulding the roll-tilt of the crown moulding running up the rake wall will look better. Crown moulding with a spring angle of 38° should be your first choice. The rolled crown spring angle is equal to the Crown Moulding Spring Angle + Rake Ceiling Slope Angle. With an 38° spring angle and a roof slope angle of 33.69007°, 8:12 pitch, the rolled crown spring angle is equal to 38° + 33.069007° = 71.69007°. With a 45° spring angle it would be equal to 45° + 33.69007° = 78.69007°.

All of the crown moulding should be back beveled to set tightly against the ceiling. Use the Crown Slope Reference Plane Angle to back bevel the top edge of all of the crown moulding.

Start with the lower horizontal crown moulding. Place the lower horizontal crown moulding against the wall and scribe the bottom of the crown moulding for a reference line. Draw parallel lines from the rake ceiling for the rake crown moulding. Do not use the same dimension as the  horizontal crown moulding reference line for the rake ceiling reference line. These are parallel lines determined by the intersection of the bottom of the horizontal crown moulding with the rake ceiling wall.

Roof  Pitch  in Inches per Rise of  Roof in 1 Foot of Run -- Roof Slope Angles
• 0.5:12 = 2.38594°
• 1:12 = 4.76364°
• 1.5:12 = 7.12502°
• 2:12 = 9.46232°
• 2.5:12 = 11.76829°
• 3:12 = 14.03624°
• 3.5:12 = 16.26020°
• 4:12 = 18.43495°
• 4.5:12 = 20.55605°
• 5:12 = 22.61986°
• 5.5:12 = 24.62356°
• 6:12 = 26.56505°
• 6.5:12 = 28.44293°
• 7:12 = 30.25644°
• 7.5:12 = 32.00538°
• 8:12 = 33.69007°
• 8.5:12 = 35.31121°
• 9:12 = 36.86990°
• 9.5:12 = 38.36749°
• 10:12 = 39.80557°
• 10.5:12 = 41.18593°
• 11:12 = 42.51045°
• 11.5:12 = 43.78112°
• 12:12 = 45.00000°
• 12.5:12 = 46.16914°
• 13:12 = 47.29061°
• 13.5:12 = 48.36646°
• 14:12 = 49.39871°
• 14.5:12 = 50.38931°
• 15:12 = 51.34019°
• 15.5:12 = 52.25319°
• 16:12 = 53.13010°
• 16.5:12 = 53.97263°
• 17:12 = 54.78241°
• 17.5:12 = 55.56101°
• 18:12 = 56.30993°
• 18.5:12 = 57.03060°
• 19:12 = 57.72436°
• 19.5:12 = 58.39250°
• 20:12 = 59.03624°
• 20.5:12 = 59.65675°
• 21:12 = 60.25512°
• 21.5:12 = 60.83239°
• 22:12 = 61.38954°
• 22.5:12 = 61.92751°
• 23:12 = 62.44719°
• 23.5:12 = 62.94940°
• 24:12 = 63.43495°
Key Words:
Cathedral ceiling rake crown molding miter and bevel angles
Vaulted ceiling rake crown molding miter and bevel angles
Sloped ceiling rake crown molding miter and bevel angles