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Housekeeping • All participants are muted. • This event will be recorded and available on http://dee.ne.gov/ • Type in “Video Events” (without quotes) in the search bar. • If you are having audio issues when connecting via computer, please call in via phone at: 1-415-655-0003 access code: 929 898 981 • Certificates will be available for those viewing the presentation live, not for those downloading after the presentation. They will be sent within the next week. 2
Questions • Please feel free to submit questions in chat throughout the presentation. They will be answered during specified breaks during the presentation. • We can stay on longer than the originally scheduled end time to answer questions. • An FAQ document will be uploaded to the video events page. 3
Why Energy Codes? • IECC addresses both residential and • Energy Codes set minimum efficiency commercial construction; IBC addresses all of the subsets of commercial construction requirements for new and renovated buildings, assuring reductions in energy use and emissions over the life of the building. Energy Codes are a subset of building codes, which establish baseline requirements and govern building construction. • Code buildings are more comfortable and cost-effective to operate, assuring energy, economic and environmental benefits. • The relationship between the IBC and the IECC • IECC addresses only energy topics • IBC addresses all topics (structural, plumbing, etc.) in One book 4
Structure of f the 2018 IE IECC • What are Commercial Buildings? • All buildings other than: Commercial Section • One- and two-family dwellings, Ch. 1 Scope and Application/ townhouses of any size and R-2, R-3, Administration and Enforcement R- 4 ≤ 3 stories • All buildings that are not “residential” Ch. 2 Definitions by definition; are “commercial” Ch. 3 General Requirements Ch. 4 Commercial Energy Efficiency Ch. 5 Existing Buildings Ch. 6 Referenced Standards Index 5
Commercial Buil ildings Can Be Complicated! Mixed Use Buildings Exempt Buildings • Treat the residential portion of the building • Buildings or portions of buildings that are under applicable residential code separated from remainder of building by building thermal envelope assemblies • Treat the commercial portion of the complying with C402 are exemp t from the building under applicable commercial code Envelope provisions if: • Code Official has the final authority • Peak design rate of energy < 3.4 Btu/h/ft 2 regarding compliance materials, software, or 1.0 watt/ft 2 of floor area for space worksheets, compliance options conditioning purposes, OR • Those portions or building that do not contain conditioned space, OR • Greenhouses 6
Equipment Buil ildings Buildings that comply with the following are exempt from the building thermal envelope provisions: • Separate building with floor area < 500 ft 2 (50 m 2 ) • Intended to house electronic equipment with installed equipment power totaling > 7 watts/ft 2 (75W/m 2 ) • Heating system capacity < 17,000 Btu/hr (5 kW) and a heating thermostat set point that is restricted to < 50ºF • Average wall and roof U-factor < 0.200 in Climate Zones 1-5 7
Structure of f the 2018 IE IECC IECC Terminology Mandatory Requirements ( apply everywhere ) • Infiltration Control • Prescriptive • Duct Insulation, Sealing & Testing, No Use • Required but can be reduced or eliminated in trade of Building Cavities for compensating improvements elsewhere • HVAC Controls • Mandatory • Piping Insulation & Circulating Service • Required and cannot be traded down, even in the simulated performance path Hot Water Requirements • Climate Specific Requirements • Equipment Sizing • Dampers • Roofs • Lighting • Above Grade Walls • Foundations Some Elements Have “Hard Limits” • Basements • AKA “Trade - Off Limits” or “Backstops” • Slabs • Crawlspaces • A Prescriptive Requirement that can only • Windows, Skylights, and Doors be traded so far • Solar Heat Gain Coefficients 8
IE IECC Commercial Compliance Paths/Options Prescriptive Simulated Performance ASHRAE 90.1-2016 Section C402 – Envelope Section C407 – Total Building Performance Section C403 – Mechanical Section C402.5 – Air Leakage Section C404 – Service Water Heating Section C403.2 – Mechanical Systems Section C405 – Lighting Section C404 – Service Water Heating Section C406 – At Least One Required Section C405 – Lighting Mandatory Sections C406.6 - Dedicated Outdoor Air C406.2 - Eff. HVAC Performance System Building energy cost to be ≤85% of C406.7 - High Eff. Service Hot C406.3 - Reduced Lighting Power standard reference design Water C406.4 - Enhanced Lighting C406.8 - Enhanced Building Controls Envelope C406.5 -On-Site Renewable C406.9 – Reduced Air Infiltration Energy 9
Prescriptive Path Approach Compliance 10
Roof Assemblies Roof R-values and U-factor requirements are based on assembly type and insulation placement Climate Zone Zone 5 All other Group R Insul. Entirely Above Deck R-30ci R-30ci Metal Buildings a, b R-19+R-11 LS R-19+R-11 LS Attics and other R-38 R-49 • Skylight curbs to be insulated to the level of roofs with insulation entirely above deck or • Continuous Insulation ( CI ) R-5, whichever is less • Liner System (LS) • Exception: unit skylight curbs included as • Insulation thickness can vary ≤ 1” and area a component of a skylight listed and weighted U-factor meets the requirements of labeled per NRC 100) Table C402.1.3 11
Roof Assemblies Insulation Insulation Parallel to Purlin Parallel to Purlin Insulation Insulation Draped Over Draped Over Purlin Purlin Thermal Blocks Thermal Blocks Picture from NAIMA Picture from NAIMA Dropped Ceiling Dropped Ceiling • Insulation on suspended ceiling with removable ceiling tiles is not • Thermal spacer block are required on considered for code compliance and all metal buildings or must use U- not considered part of the minimum factor Compliance Method thermal resistance of the roof insulation 12
Wall ll Assemblies Photo courtesy of Dow Building Solutions Above-grade walls are those walls covered by Section C402.2.3 on the exterior of the building and completely above grade or walls that are more than 15 % above grade Photo courtesy of Masonry Magazine Climate Zone Zone 5 All other Group R Mass R-11.4ci R-13.3ci Mass walls must comply with one of the following: Metal Buildings R-13+R-13 ci R-13+R-13 ci • Walls weigh at least 35 lbs/ft 2 of wall surface Metal Framed R-13+R-7.5 ci R-13+R-7.5 ci area Wood Framed & Other R-13+R-3.8 ci R-13+R-3.8 ci • 25 lbs/ft 2 of wall surface area if material weight OR R-20 OR R-20 is ≤ 120 lb/ft 3 • Cavity insulation or cavity plus continuous (ci) • Heat capacity > 7 Btu/ft 2 • Continuous insulation not broken up by framing • Heat capacity > 5 Btu/ft 2 if the material weight members e.g., rigid board insulation is < 120 pcf 13
Below Grade Wall ll Assemblies and Opaque Doors Below grade walls are a basement or first-story with ≥ 85% below grade Climate Zone Zone 5 Climate Zone Zone 5 All other Group R All other Group R Below Grade Wall R-7.5ci R-7.5ci Non-swinging R-4.75 R-4.75 • Insulation must extend down 10 ft from the • Non-swinging/Overhead Doors - R-value outside finished grade level or to the level of the lowest floor, whichever is less Tested. Entrance door requirements are included in the Fenestration and SHGC • Heated slabs installed below grade (footnoted requirements information to Tables C402.1.3 and C402.2.14) • Below grade walls must meet exterior insulation requirements for heated slabs 14
Flo loor Assemblies Climate Zone Zone 5 Floor framing cavity insulation or structural slab insulation should be installed to maintain All other Group R permanent contact with underside of subfloor Mass R-10ci R-12.5ci decking or structural slabs Joist/Framing R-30 R-30 Exceptions : • Framing cavity insulation or structural slab insulation is permitted to be in contact with top side of sheathing or Joist/Framing (Steel/Wood) ci installed on the bottom side of floor where • Insulation installed between framing combined with insulation that meets or exceeds R- value in Table for “Metal framed” or “Wood framed Mass Floors and other” values for “Walls, Above Grade” and • Materials weighing (of floor surface area) extends from the bottom to the top of all perimeter 35 lbs/ft 2 , or floor framing or floor assembly members • Insulation applied to underside of concrete floor slabs • 25 lbs/ft 2 if material weight is ≤ 120 lbs/ft 3 is permitted an airspace of < 1” where it turns up and is • Insulation installed continuously in contact with underside of floor under walls associated with the building thermal envelope 15
Sla lab Edge In Insulation Climate Zone Zone 5 All other Group R Unheated Slabs R-10 for R-10 for 24” below 24” below Heated Slabs R-15 for R-15 for 26”” below + 26”” below + R-5 full slab R-5 full slab Exception : Where slab-on- grade floor is > 24” below finished exterior grade - perimeter insulation is not required 16
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