Insulation entirely above deck

U-0.027

U-0.027

Metal buildings

U-0.031

U-0.031

Attic and other

U-0.021

U-0.021

Joist or single rafter

U-0.027

U-0.027

Massg

U-0.104d

U-0.078

Mass transfer deck slab edge

U-0.20

U-0.20

Metal building

U-0.052

U-0.052

Steel framed

U-0.055

U-0.055

Wood framed and other

U-0.054

U-0.051

Below-grade wallb, g

Same as above grade

Same as above grade

Masse

U-0.031

U-0.031

Joist/framing

U-0.029

U-0.029

Unheated slabs

F-0.54

F-0.54

Heated slabsc

F-0.55

F-0.55

Swinging door

U-0.37

U-0.37

Nonswinging door

U-0.34

U-0.34

Garage door <14% glazing

U-0.31

U-0.31

Use of opaque assembly U-factors, C-factors, and F-factors from Appendix A is required unless otherwise allowed by Section C402.1.4.

Where heated slabs are below grade, they shall comply with the F-factor requirements for heated slabs.

Heated slab F-factors shall be determined specifically for heated slabs. Unheated slab factors shall not be used.

Exception: Integral insulated concrete block walls complying with ASTM C90 with all cores filled and meeting both of the following:

 

1. At least 50 percent of cores must be filled with vermiculite or equivalent fill insulation; and

 

2. The building thermal envelope encloses one or more of the following uses: Warehouse (storage and retail), gymnasium, auditorium, church chapel, arena, kennel, manufacturing plant, indoor swimming pool, pump station, water and waste water treatment facility, storage facility, storage area, motor vehicle service facility. Where additional uses not listed (such as office, retail, etc.) are contained within the building, the exterior walls that enclose these areas may not utilize this exception and must comply with the appropriate mass wall R-value from Table C402.1.3/U-factor from Table C402.1.4.

"Mass floors" shall include floors weighing not less than:

1. 35 pounds per square foot of floor surface area; or

2. 25 pounds per square foot of floor surface area where the material weight is not more than 120 pounds per cubic foot.

Opaque assembly U-factors based on designs tested in accordance with ASTM C1363 shall be permitted. The R-value of continuous insulation shall be permitted to be added or substracted from the original test design.

Peripheral edges of intermediate concrete floors are included in the above-grade mass wall category and therefore must be insulated as above-grade mass walls unless they meet the definition of Mass Transfer Deck Slab Edge. The area of the peripheral edges of concrete floors shall be defined as the thickness of the slab multiplied by the perimeter length of the edge condition. See Table A103.3.7.2 for typical default U-factors for above-grade slab edges and footnote c for typical conditions of above-grade slab edges.