510 R.I. Code R. 510-RICR-00-00-8.6

Current through November 7, 2024

Section 510-RICR-00-00-8.6 - Chapter 4[CE]

Delete C401.2 Application. And add the following:

C401.2 Application. Commercial buildings projects shall comply with the requirements in sections C403 (Building Envelope Requirements), C403 (Building Mechanical Systems), C404 (Service Water Heating), C405 (Electrical Power and Lighting Systems) and C406 (Tenant Spaces, including C406.1.1) in its entirety. As an alternative, commercial buildings projects shall comply with the energy cost budget method in ASHRAE/IESNA 90.1.

Delete without substitute section C401.2.1 Application to existing building.

Delete Table C402.1.4 and substitute the following

TABLE C402.1.4

OPAQUE THERMAL ENVELOPE ASSEMBLY REQUIREMENTS

CLIMATE ZONE	5
All other	Group R
Roofs
Insulation entirely above deck	U-0.032	U-0.032
Metal buildings	U-0.035	U-0.035
Attic and other	U-0.027	U-00021
Walls, Above Grade
Mass	U-0.090	U-0.80
Metal building	U-0.052	U-0.052
Metal framed	U-0.064	U-0.064
Wood framed and other	U-0.064	U-0.064
Walls, Below Grade
Below-grade walls	C-0.119	C-0.119
Floors
Mass	U-0.074	U-0.064
Joist/Framing	U-0.033	U-0.033
Slab-on Grade Floors
Unheated slabs f	F-0.79/0.64	F-0.79/0.64
Heated slabs	F-0.58	F0.58
Opaque Doors
Swinging Door	U-0.37	U-0.37
Garage Door < 14% Glazing	U-0.31	U-0.31

a. Use opaque assembly U-factors, C-factors, and F-factors from ANSI/ASHRAE/IESNA 90.1 Appendix A shall be permitted, provided the construction complies with the applicable construction details from ANSI/ASHRAE/IESNA 90.1 Appendix A.

b. When heated slabs are placed below-grade, below grade walls must meet the F-factor requirements for heated slabs.

c. The first value is for perimeter the second value is for full slab insulation

Delete Table C402.1.3 and substitute the following:

TABLE C402.1.3

OPAQUE THERMAL ENVELOPE REQUIREMENTS

CLIMATE ZONE	5
ALL OTHERS	GROUP R
Roofs
Insulation entirely Above deck	R-30ci	R-30ci
Metal buildings (with R-5 thermal blocks^a,b) (Assembly descriptions can be found in ANSI/ASHRAE/IESNA Appendix A.) (When using R-value compliance method, a thermal spacer block shall be provided, otherwise use the U-factor compliance method in Table C402.1.2.)	R-19 + R-11LS	R-19 + R-11LS
Attic and other	R-38	R-49
Walls, Above Grade
Mass	R-11.4ci	R-13.3 ci
Metal building^c (When using R-value compliance method, a thermal spacer block shall be provided, otherwise use the U-factor compliance method in Table C402.1.2.)	R-13 + R-13ci	R-13 + R-13ci
Metal framed	R-13 + R-7.5ci	R-13 + R-7.5ci
Wood framed and other	R-13 + R-3.8ci or R-20	R-13 + R-7.5ci or R-20 + R-3.8ci
Walls, Below Grade
Below grade wall^c (R-5.7ci is allowed to be substituted with concrete block walls complying with ASTM C 90, un-grouted or partially grouted at thirty-two inches (32") or less on center vertically and forty-eight inches (48") or less on center horizontally, with un-grouted cores filled with materials having a maximum thermal conductivity of 0.44 Btu-in/h-	R-7.5ci	R-7.5ci
Floors
Mass	R-10ci	R-12.5ci
Joist/framing Steel/(wood)	R-30	R-30
Slab-on-Grade Floors
Unheated Slabs	R-10 for 24" below	R-10 for 24" below
Heated slabs	R-15 for 36" below + R5 Full Slab	R-15 for 36" below + R5 Full Slab
Opaque doors
Swinging	U -0.37	U -0.37
Roll-up or sliding	R -4.75	R -4.75

For SI:1 inch = 25.4mm.

Ci = Continuous insulation. NR = No requirement.

a. Assembly descriptions can be found in ANSI/ASHRAE/IESNA Appendix A.

b. When using R-value compliance method, a thermal spacer block shall be provided, otherwise use the U-factor compliance method in Table C402.1.2.

c. R-5.7ci is allowed to be substituted with concrete block walls complying with ASTM C 90, ungrouted or partially grouted at thirty-two inches (32") or less on center vertically and forty-eight inches (48") or less on center horizontally, with ungrouted cores filled with materials having a maximum thermal conductivity of 0.44 Btu-in/h-f2 F.

d. Where heated slabs are below grade, below-grade walls shall comply with the exterior insulation requirements for heated slabs.

e. Steel floor joist systems shall be insulated to R-38.

Delete Table C402.4 and substitute the following

TABLE C402.4

BUILDING ENVELOPE REQUIREMENTS: FENESTRATION

CLIMATE ZONE	5
Vertical fenestration
U-factor
Fixed fenestration	0.38
Operable fenestration 0.45
Entrance door	0.77
SHGC
SHGC
S E W	PF<0.2 PF 0.2-0.5 0.38 /0.46 / PF> 0.5 0.61
N	PF <0.2 0.51 PF 0.2-0.5 0.56 PF >.5 0.61
Skylights
U-factor	0.50
SHGC	0.40

Add Exception: #8

C402.5.7: Exception: #8 Where a compliant main entrance is already required such as patio doors intended for seasonal use.

Section C403.2.1 Delete and Substitute:

C403.2.1 Calculation of heating and cooling loads. Design loads shall be determined in accordance with the procedures described in the ANSI/ASHRAE/ACCA Standard 183.

The design loads shall account for the building envelope, lighting, ventilation and occupancy loads based on the projected design.

Heating and cooling loads shall be adjusted to account for load reductions that are achieved when energy recovery systems are utilized in the HVAC system.

Alternatively, design loads shall be determined by an approved equivalent computation procedure, using the design parameters specified in Chapter 3.

Delete C403.7.1 and replace with Demand controlled ventilation (Mandatory)

Demand control ventilation (DCV) shall be provided for spaces larger than five hundred (500) square feet (46.5 m2) and with an average occupant load of twenty-five (25) or more people per one thousand (1,000) square feet (93 m²) of floor area and served by systems with one or more of the following:

TABLE C403.7.4(1)

ENERGY RECOVERY REQUIREMENT

CLIMATE ZONE	PERCENT (%) OUTDOOR AIR AT FULL DESIGN AIRFLOW RATE
	>30% AND <40%	>40% AND <50%		>50% AND <60%		>60% AND <70%		>70% AND <80%		> 80%
	DESIGN SUPPLY FAN AIRFLOW RATE (cfm)
5	> 5500	>4500	> 3500		> 2000		> 1000		> 0

403.11.1 Delete and substitute:

C403.11.1 Duct and plenum insulation and sealing (Mandatory). All supply and return air ducts and plenums shall be insulated with a minimum of R-8 insulation when located in unconditioned spaces and a minimum of R-12 insulation when located outside the building. When located within a building envelope assembly, the duct or plenum shall be separated from the building exterior or unconditioned or exempt spaces by a minimum of R-8 insulation.

Exceptions:

1. When located within equipment.

2. When the design temperature difference between the interior and exterior of the duct or plenum does not exceed fifteen degrees Fahrenheit (15° F) (eight degrees Celsius (8° C)).

3. All ducts, air handlers and filter boxes shall be sealed. Joints and seams shall comply with section 603.9 of the International Mechanical Code.

Delete Table C403.5.3.3 and replace with the following Table 403.5.3.3 High-Limit Shutoff Control Setting for Air Economizers^b
Device Type		Required High Limit (Economizer Off When):
		Equation	Description
Fixed dry bulb	T_OA>70°F	Outdoor air temperature exceeds 70°F
			Differential dry bulb	T_OA> T_RA	Outdoor air temperature exceeds return air temperature
			Fixed enthalpy with fixed dry-bulb temperatures	h_OA>28Btu/lb^a or T_OA>75°F	Outdoor air temperature exceeds 28 Btu/lb of dry air^a or Outdoor air temperature exceeds 75°F
For SI: 1 foot = 305mm, °C = (° F - 32)/1.8, 1 Btu/lb = 2.33 kJ/kg. a. At altitudes substantially different than sea level, the fixed enthalpy limit shall be set to the enthalpy value at 75°F and 50-percent relative humidity. As an example, at approximately 6,000 feet elevation, the fixed enthalpy limit is approximately 30.7 Btu/lb. b. Devices with selectable setpoints shall be capable of being set to within 2°F and 2 Btu/lb of the setpoint listed.

Delete without substitute section C407

510 R.I. Code R. 510-RICR-00-00-8.6

Amended effective8/1/2019
Amended effective 2/1/2022