Do the same with the next shingle continuing this step until you get to the far edge of the ridge.
How to do a roof chop.
The seat rests on top of the wall that you re attaching the particular rafter to while the shoulder cut parallels the wall and allows several inches of each rafter to overhang the roof.
Then fold the flashing over the peak and cover the cut ends with self stick underlayment.
Chopping a top what.
The roof rafters provide integral structural support to the roof.
We used some clamps to hold it while we cut the a pillars.
This is where the quality of planning for the chop shows up.
To lower that profile dry lakes racers and hot rod builders mimicking the look of racecars cut the roof off of the vehicle and reattached it after removing part of the sheet metal and posts through the center of the window line.
Each shingle should be held by four nails.
A horizontal cut called the seat cut and a vertical cut called a shoulder cut.
Start by installing self stick underlayment on the decking.
Before you cut your boards you ll need to measure the width of your building and calculate the exact length of each rafter.
It takes a month to finish weld the chop.
Be careful to drive nails straight rather than angled.
It takes one weekend to chop the top and tack weld it back on.
A quick glimpse of the chop taking shape.
This process is much easier with two people.
Finally it can take up to a year to finish the bodywork on a bad roof chop.
Read this before you chop.
The next cut will be the back of the roof.
As you can see from the cut tack our roof actually went up about a inch.
Roof valleys channel a lot of water so they need extra protection.
See all 21 photos.
Since the angle will be different now cut slits along the edge of deck lid opening.
There are two basic methods of pitched roof construction.
I added them after we started cutting it but it worked ok.
Cut the flashing back to the peak along each crease.
Cut the last ridge shingle to the length you need but be sure that no part of the roof is exposed.
Pitched roof construction.
The deck lid piece is next.
Any fool can do this.
I must note that before you make this cut draw several vertical lines that you can use for reference at a later time.
This will allow you to push down the lip to meet the correct angle.
Seriously if the doors don t fit right before you cut the roof off a car i can assure you that they won t fit after you weld it back on and the results could be permanent.
After the cuts are done the roof will be real floppy.
A cut roof this is the traditional method of cutting the timber on site and building up the roof using rafters ridge boards joists and purlins etc the exact details being determined by the size of roof size of timbers etc.
A birdsmouth cut has 2 parts.
