Roofs

The roof is the upper portion of the building envelope, including opaque areas and fenestration that is horizontal or tilted at an angle of less than 60° from horizontal. 

Energy Asset Score Inputs for Roofs:

Name – Default component text and counters are automatically added.  This entry may be edited to include other descriptive or identifying text.

Roof Type – Pull-down menu selections:

Built-up – A built-up roof is composed of several layers of roofing felts reinforced with asphalt and covered by a heavy asphalt coat embedded with gravel (e.g., Ethylene Propylene Diene Monomer (EPDM), which is a thermoset type of flexible single-ply sheet used as a common roofing material in low-slope roofing applications). Select the deck construction material that is used (Concrete, Metal, or Wood).

Metal Surfacing – Constructed with a metal, structural, weathering surface that has no ventilated cavity and has the insulation entirely below deck and its structure consists of one or more of the following configurations:

• metal roofing in direct contact with the steel framing members
• insulation between the metal roofing and the steel framing members
• insulated metal roofing panels installed.

Shingles/Shakes – A series of overlapping rows of roofing material, including wood, plastic, fiber glass, baked clay, tile, slate, asbestos, asphalt, and aluminum

Thermal Properties – Pull-down menu selections:

I don't know – The insulation level will be inferred based on the building type, age, location, roof type, and intended occupancy type.

Insulation R-value – Measure of thermal resistance: the reciprocal of the time rate of heat flow through a unit area induced by a unit temperature difference between two defined surfaces of material or construction under steady-state conditions. R-values are given in units of ft²•°F•h/Btu

Insulation thickness – Thickness of insulating material used in units of inches.

Assembly U-value – Measure of thermal transmittance per unit time per unit area of the roof material and the boundary air films, induced by unit temperature difference between the environments on each side. U-value is inverse of R-value. U-values are given in units of Btu/ft²•°F•h

Intended Occupancy Type – Available if 'I don't know' is selected for Thermal Properties. Pull-down menu selections include: Non-Residential, Residential, and Semiheated.

Cool Roof – Check box: Select if a cool roof membrane is present. Cool roofs are constructed with a material that reflects sunlight and emits thermal energy, and are "cooler" than conventional roofs, which reduce the amount of heat transferred into the building