Make roof dormers and other outside corners leakproof. The Family Handyman. ... You’ll have to measure your roof slope and ...

The gutters come in lengths of 10 feet, but you’ll probably also need to buy inside and outside corners, end caps, downspout assemblies, slip connectors, chalk line, etc.

1. Walk Around. Inspect the roof from the outside and make observations. Identify areas with signs of wear and tear, aging or sagging. Watch for piles of debris or leaves.