Typical recommendations for exterior walls are R-13 to R-23, while R-30, R-38 and R-49 are common for ceilings and attic spaces.
What R-value do I need for flat roof?
= 7.2
Is TPO a Class A roof?
Class A Fire-Rated – TPO membranes and EPDM can achieve Underwriters Laboratories (UL) Class A fire resistance listings by adding fire retardant chemicals during the manufacturing process.
What is the R-value for roof insulation?
Typical recommendations for exterior walls are R-13 to R-23, while R-30, R-38 and R-49 are common for ceilings and attic spaces. See the Department of Energy's (DOE) ranges for recommended levels of insulation below.
How do you calculate the R-value of a roof?
To calculate the R-value, you simply add together the total thickness (in inches) of each insulating material within your roofing system: “For each different material, multiply the thickness by the standard R-value per inch for that material.2020-09-09
Is TPO a vapor barrier?
It is relatively inexpensive and will protect the insulation against the interior vapor, but it does not count as an air barrier. Though it comes at a higher cost, the better option is a fully adhered vapor barrier, which typically consists of 40 mil self-adhering membranes.2016-07-14
What is minimum R-value for roof?
Install a single-ply roofing system A single-ply roofing system (TPO or EPDM) has a 0.24-0.33 R-value with a typical installed thickness level, therefore you'll need considerable thickness of insulation to get you to an R-30.
What is the R-value for built up roofing?
R-Value of Roofing Materials and Building Insulation
------------------------------------------------------------------
Asphalt Shingles
Built-up Roof Membrane, Gravel-Surfaced (Membrane and Gravel Only)
Built-up Roof Membrane, Smooth-Surfaced (Membrane Only)
Cellulose, Blown (Attic)
What is the required R-value for roof?
Install a single-ply roofing system A single-ply roofing system (TPO or EPDM) has a 0.24-0.33 R-value with a typical installed thickness level, therefore you'll need considerable thickness of insulation to get you to an R-30.