Plain-English, illustrated guides to roofing materials, flashing, gutters, ventilation and repairs for homeowners.

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Roof Basics
- Parts of a Roof
- Roof Types, Pitch & Measurements
Materials
Leaks & Repairs
- Roof Leaks
- Damage & Repairs
Attic & Ventilation
- Attic Ventilation
- Moisture, Ice & Insulation
Gutters & Drainage
- Gutter Types & Sizes
- Gutter Maintenance
Replacement & Maintenance
- Roof Replacement
- Maintenance & Protection

Parts of a Roof

Every roof is a system of layers and edges that move water off the house. These guides name each part and explain what it does.

Roof Basics

How a Roof Works: Layers, Parts and Water Flow

October 16, 2026

Flat illustration of a house roof cut away to show framing, deck, underlayment and shingles, with raindrops running down to a gutter

Framing, deck, underlayment, flashing and covering: how the layers of a roof divide the work of keeping water out, and how rain travels from ridge to gutter.

Roof Systems Explained

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General information only, not professional advice. Work on a roof is dangerous: for inspections, repairs or anything at height, hire a licensed roofer. Electrical and structural work belong to licensed professionals.

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