How do you angle siding in a gable???

Ive seen Good and Bad examples of houses when I drive by,
I want to follow the plane of the gable about 45 degrees,
split down the center with J channel..... now do you start at the bottom of the gable and go up? working small to large or is there a trick to it???

 

Are you asking how to make a sunburst with vinyl siding?

 

Tinman - You can use back to back J channel, but I think an H divider is a better choice. Install it first extending plumb from the gable peak. Then install J along side the gable overhang. Install a piece of siding overlapping the H or doubled J and mark the plumb line where it crosses the center. Cut this and use it as a template for the remaining pieces. Do the same with the opposite end to get the level cut.

 

Assuming that you mean that you want the siding to run parallel to the roof line versus parallel to the ground...

Start at the bottom in the center. Since you mentioned "J" channel, I'm also assuming you are talking about vinyl.
Use two pieces of "J" back to back to form the center (or "H" if it is available for your siding), and another piece of "J" for the bottom (since there won't be a normal bottom to use a starter strip with).

It may be helpful to draw lines at 45 degrees ahead of time for reference to keep the short pieces lined up correctly.

 

Tin man I think your not talkin of a sunburst.
. You want the pitch of your roof to match the lines of your work and come down to the center of a gable and meet up on every but line from top panel down.
First find dead center and make a dubble J on your break or buy one and plum from the peak down to your header's.
Then what I have done is work from the roof down useing Soffit material start at the roof, same as the roof pitch, and work both sides the same commiing down so the lines kiss each other at the D J and work it out so my the lines meet together at the DJ all the way down.

As im workin down I keep eyes on my tape and end work it out so both sides make the same point

 

hey guys thanks alot.
yes I am using viynl siding and Im following the plane of the roof
Im not for sure if H-channel is available . so I just may have to stick with J .
thank for the advice I can see now that making templates is the way to go.