Last reviewed: October 4, 2026. Current product/program references and supporting Roofing Giant evidence links were checked for this resource.
Video guide · Roofing system basics
Watch the essential roofing-system components Roofing Giant recommends homeowners understand before a roof replacement project.
This video is a visual overview of a complete roofing system. The roof covering is only one part of the assembly: deck condition, water-shedding layers, flashing, ventilation and compatible roofing components all affect how the finished roof performs.
Beyond the shingles
What a complete roof system needs to address
Roof deck
The deck must be inspected for damaged or unsuitable areas before the new roofing assembly is completed.
Water protection
Underlayment, leak-prone transition details and correctly installed flashing help manage water beneath and around the roof covering.
Ventilation
Intake and exhaust ventilation should be evaluated as part of the roof system rather than treated as an unrelated afterthought.
Roof covering and accessories
Shingles or another roof covering must be installed with compatible accessories and according to the selected system requirements.
Continue your roof research
For a component-by-component explanation, see Roof System Anatomy. You can also review our roof replacement process and roofing materials guide.
If you want the recommendations applied to your own property, schedule a free roof inspection. The final scope and products depend on the roof, manufacturer requirements and the conditions documented during inspection.
Current manufacturer reference: GAF — Parts of a Roof / roofing system components ↗. Use current GAF product and warranty documents for the exact system quoted to you.
Contractor credential status: GAF product use in Roofing Giant project records does not by itself establish current contractor-program status or enhanced-warranty eligibility. See Roofing Giant Credentials & Verification and confirm the applicable manufacturer program for the specific project.
See documented GAF project evidence
Roofing Giant’s manufacturer project library connects named GAF products and colors to specific DFW project records and original photographs.