2021 ENERGY CODE Compliance Guide to Homes in Maine

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2021 IECC Compliance Guide to Homes in Maine

Instructions are strongly advised to obtain a copy of the IECC and all of
Maine's MUBEC codes to refer to for any questions and
1. Using the climate zone map, match the jurisdiction to further details on compliance.
the appropriate IECC climate zone. Use the simplified
table of IECC building envelope requirements (below) to Limitations
determine the basic prescriptive requirements for the
thermal envelope associated with the jurisdiction. Be This guide is an energy code compliance aid for Maine
sure to check the actual Table R402.1.3 in the IRC to based upon the simple prescriptive option of the 2021
read all footnotes. IECC. It does not provide a guarantee for meeting the
IECC. This guide is not designed to reflect the actual
2. Use the "Outline of 2021 IECC Requirements" energy code, with amendments, if any, adopted in Maine
printed on the back of this sheet as a reference for our and does not, therefore, provide a guarantee for
Summary of important IECC requirements. Be sure to meeting the state energy code. For details on the
read and understand the actual IECC to construct the energy code adopted by Maine, including how it may
building according to the full requirements of the IECC differ from the I ECC, please verify with the Maine Fire
and other applicable code requirements. Marshall's
Office.
Climate Zone 6
Climate Zone 7 8 8
The 2021 International Energy Conservation Code

The 2021 IECC was developed by the International Code Council (ICC) and the free Basic, Digital Code is currently available to view, from a desktop computer, on the ICC website at https://codes.iccsafe.org. The Maine State Fire Marshall's Web Site has a complete list of all MUBEC codes and listed amendments in their Rules of Chapters found at https://www.maine.gov/dps/fmo/. The IECC is part of Maine's complete MUBEC building codes and is law for the entire state. Some towns may adopt a Stretch Code, so be sure to check with your local Authority Having Jurisdiction (AHJ). Users of this guide 2021 Climate Zone Map

                            Windows                                  Insulation                                  Foundation
                                          Glazed
                fenestration Skylight   Fenestratio
                                                                   Wood         Mass                  Basement      Slab         Crawl
                  U-Factor   U-Factor        n
                                                      Ceiling   Frame Wall      Wall         Floor      Wall      R-Value      Space wall
                                          SHGC
                                                      R-Value     R-Value      R-Value      R-Value    R-Value    & Depth       R-Value
2015 Zone 6           .32     .55        NR                        20 4:                      30
                                                        49         Sex.       15/20                    15/19       10, 4ft      15/19
       Zone 7         .32    .55        NR             49         13 - 10
                                                                20+5 or 13+10 19/21          38         15/19      10, 4ft        15/19

                                                                   30 or
2021                                                              20+5 ci
                                                                                                       15ci or                  15ci or
       zone 6         0.3     0.55           NR         60                       15/20        30        19, or     10ci, 4ft      19,
                                                                  13+10ci
                                                                                                       13+5 ci                  13+ 5ci
                                                                  0+20ci

Highlights of 2021 IECC Requirements Be sure to read and understand the complete MUBEC Codes for yourself electronic copies can be found at www.maine.gov/dps/fmo/building-codes

R401.3 Certificate - A permanent certificate shall be completed without an NFRC label must use the default values in IECC
by the builder or other approved party and posted inside the section R303.1.3. See www.nfrc.org for more details on the
building. The certificate shall indicate the following: NFRC rating system.
1. The predominant -values of insulation Windows, skylights, and sliding glass doors must also be labeled in a
2. U-factors of fenestration and the solar heat gain manner to show that they meet the IECC's air infiltration
coefficient (SHGC of fenestration.)
requirements.
3. The results from any required duct system and building
envelope air leakage testing performed on the building R402.4 Air leakage
4. The types, sizes and efficiencies of heating, cooling
Testing -The building or dwelling unit shall be tested for air
and service water-heating equipment.
leakage. A written report of the results of the test shall be signed
5. Where on-site photovoltaic panel systems array
by the party conducting the test. Where required by CEO testing
capacity, inverter efficiency, panel tilt and orientation
6. For buildings where an Energy Rating Index score is shall be done by an approved third party. Testing shall comply
determined in accordance with Section R406 with R402.4.1.2
7. The code edition under which the structure was Leakage Rate - The building or dwelling shall have an air
permitted, and the compliance path used. leakage rate not exceeding 3.0 air changes per hour.

R402.2 Specific insulation requirements. R403.1 Controls - Temperature controls must be installed, Ceilings with attics. — R-60 min insulation in the ceiling or including a programmable thermostat where required. attic, installing R-49 over 100 percent of the ceiling or attic R403.3 Ducts area requiring insulation shall satisfy the R-60 wherever Ducts outside the Thermal Envelope - Supply and Return uncompressed insulation extends over the wall top plate at the ducts shall be insulated R-8 for 3" diameter and greater and R- eaves 6 smaller than 3" diameter. Ceilings without attics. - This reduction of insulation, not less Ducts buried within ceiling insulations - Supply and return than R30, from the requirements of Section R402.1.3 shall be shall not be less than R-8. R-19 must be maintained above and limited to 500 square feet (46 m) or 20 percent of the total below duct at all times. insulated ceiling area, whichever is less. Sealing - Ducts, air handlers and filter boxes shall be sealed. Access hatches and doors. - Access hatches and doors from Duct testing - Ducts shall be pressure tested, exception for conditioned to unconditioned spaces such as attics and crawl ducts associated with stand-alone ventilation systems. spaces shall be insulated to the same R-value required for the wall or ceiling in which they are installed. All hatches and doors shall be R403.4 Mechanical system piping insulation - Mechanical weatherstripped. System Piping with Fluids > 105deg and < 55deg shall be Steel-frame ceilings - walls and floors insulated no less than R-3 Shall comply with table R402.2.6 R403.5.2 Hot water piping - Hot water piping shall have Floors. - Installation shall be installed to maintain permanent insulation not less than R-3 when: 3/4" and larger, outside contact with the underside of the subfloor decking and be air conditioned space, from water heater to distribution, under slab, sealed. See R402.2.7 for multiple compliance paths. buried or part of recirculation system. Basement walls - shall be insulated from the top of the basement wall down to 10 feet (3048 mm) below grade or to R403.6 Mechanical Ventilation - Shall be provided with the basement floor, whichever is less. See exception in section ventilation that complies with M1505 of IRC. R402.2.8 Testing — Mechanical ventilation shall be tested and verified. Slab-on-grade floors. - Slab-on-grade floors shall be R403.7 Equipment sizing and efficiency rating - HVAC insulated R-10 from the top of the slab and extend downward 4' system must be properly sized in accordance with ACCA Manual on the outside or inside of the foundation wall. Below grade S based on building loads calculated in accordance with ACCA insulation by any combination of vertical insulation, insulation Manual J or other approved methodologies. New or extending under the slab or insulation extending out from the replacement heating and cooling equipment must meet or building. The top edge of the insulation installed between the exceed federal minimum efficiency requirements for geographic exterior wall and the edge of the interior slab shall be permitted location in which it is installed. to be cut at a 45deg Heated Slab-on-grade — R-5 shall be installed below the full R404.1 Lighting equipment-All permanently installed lighting heated slab in addition to the required R-value for slabs fixtures shall contain only high-efficacy lighting sources.

R402.3 Fenestrations                                                     R404.2 Interior lighting controls — Permanently installed
Window, door and skylight - U-factors and SHGCs must be                  fixtures shall be controlled with either a dimmer, an occupancy
determined by an accredited, independent laboratory, and labeled         sensor or control built into fixture. Exceptions: Bathrooms,
and certified by the manufacturer, in accordance with a National         Hallways, exterior lighting, lighting designed for safety or
Fenestration Rating Council (NFRC) rating. Products                      security.

Source: 2021-iecc_compliance_guide.pdf on durhammaine.gov. Text extracted with pdftotext; no wording has been corrected.