Field glossary

Exposure

The portion of each shake or shingle left to the weather, set by the piece length and the slope per the manufacturer

Used across 3 Anvilfield field guides, most in Roofing.

Also defined as

The portion of each shingle left visible to the weather, commonly around 5 in, set by the manufacturer
The portion of each slate left to the weather, equal to (slate length minus headlap) divided by two

Where this shows up