2009 iecc vs ashrae 90.1 master 121210 copy iecc vs ashrae 90.1 master 121410.pdf · ashrae...
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SourceComparison of Standard 90.1-07 and the 2009 IECC
with Respect to Commercial Buildings Prepared by the Pacific Northwest National
Laboratory for the U.S. Department of Building Energy Codes Program
December 2009
http://www.energycodes.gov/publications/research/documents/codes/90-1_iecc_comparison_final_12-16-2009.pdf
ASHRAE 90.1-2007 IECC 2009
Spaces in buildings used primarily for living and sleeping. Residential spaces include dwelling units, hotel/motel guest rooms, dormitories, nursing homes, patient rooms in hospitals, lodging houses, fraternity/sorority houses, hostels, prisons, and fire stations.
Includes R-3 buildings, as well as R-2 and R-4 buildings three stories or less in height above grade. (not R-1, hotels and motels) All else is considered commercial.
Comply with the Envelope
Requirements
Comply with the Mechanical/SWH
Requirements
Comply with the Power & Lighting
Requirements
Section 502 90.1 Section 5 Sections 503 and 504 90.1 Section 6 Section 505 90.1 Section 9
Document Compliance with
the IECC
Plan Review
Inspection
ASHRAE 90.1-2007 IECC 2009
Has a specific designation of semi-heated space (3.4 Btu/h/ft2 up to 15 or 20 for climate zone 5 or 6) and comparable thermal envelope provisions that are less rigorous than those for heated spaces. (Tables 5.5-1 through 5.5-8 for the appropriate climate zone)
No such provision for semi-heated; only conditioned or unconditioned. (Table 502.2(1))
TABLE 303.1.3(1) DEFAULT GLAZED FENESTRATION U-FACTOR
TABLE 303.1.3(2) DEFAULT DOOR U-FACTORS
ASHRAE 90.1-2007 IECC 2009
Considers glazing less than 60 degrees from the horizontal plane as skylights.
Considers glazing 15 degrees or less from vertical as skylights. (Glazing over 15 degrees from vertical is part of the wall.)
IECC 15 + degrees = Skylight ASHRAE 31 + degrees = Skylight
Roof/Skylight Area Roof/Skylight Area
ASHRAE 90.1-2007 IECC 2009
The total skylight area shall be less than 5% of the gross roof area.
The total skylight area shall not exceed 3% of the gross roof area.
ASHRAE 90.1-2007 IECC 2009
A WWR of less than 40% allows using a provision parallel to 2009 IECC.
ASHRAE allows you to exceed 40% window to wall area.
Glazing beyond the 40% maximum WWR requires a building to be evaluated under ASHRAE 90.1-2007.
ASHRAE 90.1-2007 IECC 2009
Portions of walls above grade are treated as above grade and portions of the same walls that are below grade are treated as below grade.
Any wall that is <15% above grade and 85% or more below grade is considered entirely a below-grade wall. Similarly, a wall >15% above grade would be considered entirely an above-grade wall.
ASHRAE 90.1-2007 IECC 2009
Doors that are more than one-half glass are considered fenestration.
Opaque doors are doors having less than 50% glass area and should b e considered as part of the gross area of above-grade walls that are part of the building envelope.
ASHRAE allows climate Zone 1, 2, and 3 exemptions to Vestibules
IECC allows climate Zone 1 and 2 exemptions
ASHRAE 90.1-2007 IECC 2009
Required in Climate Zones 4 – 8 only.
Required if space is conditioned.
ASHRAE 90.1-2007 IECC 2009
Allows for an increase in the allowable maximum U-factor (reduction in required R-value) for certain roof/ceiling assemblies if the roof meets certain reflectance (high albedo) and emissivity requirements.
This allowance is not provided in the 2009 IECC.
ASHRAE 90.1-2007 IECC 2009
Non-motorized dampers acceptable in Zones 1, 2 and 3.
Many more requirements.
Non-motorized dampers acceptable in buildings under 3 stories and for buildings of any height in Zones 1, 2, and 3.
ASHRAE 90.1-2007 IECC 2009
Does not limit HVAC equipment oversizing.
Limits HVAC equipment oversizing (Section 503.2.2). Heating and cooling equipment and systems shall not exceed the loads calculated in accordance with section 503.2.1 (references ASHRAE/ACCA Standard 183.)
ASHRAE 90.1-2007 IECC 2009
Tends to be more rigorous and, in some cases (e.g., fume hoods, cooling towers, dehumidification, and kitchen exhaust hoods), has requirements that are not in the IECC 2009.
Some of the HVAC equipment not listed in the IECC may be included in the IMC because it is a family of codes.
ASHRAE 90.1-2007 IECC 2009
Requires the delivery of Operation and Maintenance (O&M) manuals for the building systems. (Sections 6.7.2.2 and 8.7.2)
Requires that an operating and maintenance manual be provided to the building owner by the mechanical contractor. (Section 503.2.9.3)
ASHRAE 90.1-2007 IECC 2009
Contains a Space-by-Space method as an alternative to the by-building-type prescriptive tables for lighting power limits (Section 9.6.1 and Table 9.6.1)
The interior lighting power is the floor area for each building area type listed in Table 505.5.2 times the value from Table 505.5.2 for that area. Each building area shall be treated as a separate area.
ASHRAE 90.1-2007 IECC 2009
ASHRAE requires automatic lighting shutoff and has similar requirements for overriding automatic shutoff (e.g. 2 hours vs. 4 hours) and for sleeping unit controls as IECC.
IECC also has requirements for light reduction controls, holiday scheduling and daylight zone control that are not included in ASHRAE.
ASHRAE 90.1-2007 IECC 2009
(Retail Area 1 x 1.0 W/ft2) (Retail Area 2 x 1.7 W/ft2) (Retail Area 3 x 2.6 W/ft2) (Retail Area 4 x 4.2 W/ft2)
(Retail Area 1 x 0.6 W/ft2) (Retail Area 2 x 0.6 W/ft2) (Retail Area 3 x 1.4 W/ft2) (Retail Area 4 x 2.5 W/ft2)
ASHRAE 90.1-2007 IECC 2009
Table 9.4.5 lists LPDs for tradable vs. nontradable surfaces, but lighting zones are not designated.
Table 505.6.2(1) lists lighting zones and Table 505.6.2(2) lists LPDs for each of 4 lighting zones and for tradable and nontradable surfaces.