We had our roof redone during the summer. Low-E Thermal was installed at the suggestion of the contractor. We have a flat roof with no attic space whatsoever. The Low-E Thermal sheets were installed directly above the stripped roof, no air space above or below. Afterwards, the heat was worse than ever, even with the AC on, temperatures still rose to 85-90+ degrees. The roofer stated no air space was needed and that he did everything properly. What is your take? Was this correct? Any suggestions?
I am sorry to report that your installer is incorrect — reflective insulation and radiant barriers must always face an air space to perform. Otherwise, they will become a direct conductor of heat wherever they are in contact with another surface. Although Low-E is not a member of RIMA, I’m sure they would tell you the same. You have received no thermal value from the reflective insulation based upon your explanation of the installation.