08/27/2026
Most people only see the shingles.
But a lot of what makes a roof last is underneath them.
In this photo, you can see the roof decking, protective underlayment, metal valley flashing and shingles being installed over top.
Each layer has a job, from creating a solid base to helping move water off the roof and keeping moisture out.
Here’s a look at the part of a roofing system you normally never see.
