How do I calculate a slant cut for crown moulding?

Question

I'm trying to finish the interior of a garden shed, which has a slant roof. And while it's not "really" crown moulding, I need to cut a plank at a slant to match the ceiling line to close it out. While I should have been paying attention in geometry, thank God for Y!A. I'm sure there's a relatively simple process for this. At least, I hope.

Answer 1

It's done with a level .. first find the pitch of the roof line by drawing a level horizontal line anywhere near the bottom of the rafter,  next measure over 12 inches  along the line from the rafter. put a mark , now using your level plumb up to the rafter from that mark.. then measure the length of that line...  so that measurement is the rise and the 12inch is the run= say 4&12   so  you can lay out your board the same way.  

Answer 2

Hey zen,

Try using a level to extend the center point of the roof down to the level line of where you will be stopping the cut.  This divides the tringle in half, creating a 90 to the left and right of the plumb line on the level line. Measure over to the roof to get the distance coming out of the 90.  Measure up from the 90.  Transfer these measurements in the same fashion to the board you need to cut.  Draw a line from point to point and cut.  This will make sense if you are doing what I think you are doing,  I think you are putting some type of sheathing on the studs inside of your shed and are wanting to know how to cut for the gabled end, right?  I could be more specific if I knew the height of the walls on the either side of the gable, what size and type of sheet good you are using, what the height of your peak is, what the length/width is, and where you'd like the joints, but you can probably get it from here  

Answer 3

Crown moulding is upside down quarter-round! You still use 45 degree angles, but you need to turn the moulding over upside down when you cut it!

Trip down to home depot. They've got a little plastic gadget that you can use to measure inside and outside angles...

Answer 4

Don't need to calculate. Take couple of feet of aluminum foil and crumple it lightly. Then push it against the roof and wall meet to get the exact impression of the angle. Then take the foil to your table saw and carefully adjust the blade angle that you got from the foil.

Answer 5

You should be using a miter saw, it has built in angle ruler that calculates the cut for you, if you don't have one, you can rent one. I wouldn't recommend cutting angles without one. If you don't have alot to cut you can buy a miter box for about 10 bucks, using a reg saw will make it look unprofessional, plus crown molding is flimsy and hard to cut

Answer 6

I did find this on the web. Hope it helps.

http://ca.geocities.com/xpf51/SQUARE_CUT...

Answer 7

http://www.freewebs.com/gregoryco this site helped me these guys have tons of videos and if u cant find your answer there you can ask them