Construction Glossary
Inverted Roof
A roofing system where insulation is placed above the waterproof membrane, protecting it from damage and improving thermal performance.
What Is Inverted Roof?
An Inverted Roof, also known as a protected membrane roof (PMR), is a roofing system where the insulation is placed above the waterproof membrane. This configuration protects the membrane from temperature extremes, mechanical damage, and UV exposure, extending its service life. Inverted roofs are commonly used in flat roof designs and offer benefits such as improved thermal performance and reduced maintenance requirements.
Example
Roof design with insulation above the waterproof membrane.
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