How do I cut caps with dimensional shingles?

It is not possible to cut caps with dimensional shingles. If you use normal shingles, then you can cut the ends off and use them as ridge caps, however this is not possible with dimensional shingles. If you have done your roofing using dimensional shingles, then you should buy ridge caps made of the same material. It is important to make sure that the dimensional shingles and the caps are the same age, otherwise you will have to replace 1 before you need to replace the other, and most people prefer to replace both at the same time, as it is easier.