Roof Types
Understanding roof construction types is essential for writing and specifying roof assemblies.
Types of Flat Roofs
Cold Roof
- Insulation is placed between the joists/rafters, below the roof deck.
- Ventilation space is maintained above the insulation.
Warm Roof
- Insulation is placed on top of the structural deck, below the waterproofing membrane.
- No ventilation layer — the assembly is continuous and unventilated.
Inverted Roof (Upside-Down Roof)
- Waterproofing membrane sits directly on the structural deck.
- Insulation is placed on top of the membrane, protecting it from thermal cycling and UV.
- Also called a Protected Membrane Roof (PMR).
See A200 for Roof and Roof Deck plan types.
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