But if the pipe isn’t fitting and you need to cut it without tools, then nylon rope or twine will do the trick. A Concord Carpenter recommends 20 inches of string, which you will need to pass ...

1. Cut a piece of 4-inch PVC pipe to about 12 to 14 inches long, measured to the longest point of the roof slope. We cut an angle of about 30 degrees, but any angle from 10 to 40 degrees will work.