What is the best insulation Under 2" Cement flat Roof in NYC?

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What is the best insulation Under 2" Cement flat Roof in NYC?

Rafael Mor March 29, 2019Last updated: Aug. 3, 2020

Hi there

For NYC What is the best insulation Under 2" Cement slab Roof for energy efficiency and water leaks? Maybe 2 layers?  The base for the roof will be Metal beams.

Thanks, Rafael, Brooklyn 

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