Deck
The solid surface beneath the roofing assembly. Its condition is assessed before new layers cover it.
Take the roof apart.
Explore a simplified roof assembly. This visual explains the relationship between materials; it is not an installation plan.
Shingles
The visible, overlapping surface. Flashing and ventilation are also part of a complete roof.
Use the sliders or arrow keys. Select a material to locate it in the model.
Leak barrier
A membrane used at vulnerable roof areas. This diagram separates the layer to make its role visible; actual coverage varies.
Underlayment
A secondary weather-protection layer between the deck and the shingles.
Starter course
A starting strip at specified roof edges. The diagram enlarges it for inspection.
Shingles
The visible, overlapping surface. Flashing and ventilation are also part of a complete roof.
The exploded view uses a real shingle texture by Shadowmeld Photography, CC BY-SA 4.0. Model created for this demo. General background: GAF’s roof components guide.
Water follows the details.
The model makes the layers visible, but a roof also depends on its edges, openings, transitions, and ventilation. Those details need their own inspection.
Plan an inspection