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6A - Energy Conservation and Insulation CodeCITY OF BOULDER PLANNING BOARD AGENDA ITEM MEETING DATE: July 18, 2002 (Agenda Item Preparation Date: July 10, 2002 AGENDA TITLE: Public hearing and consideration of a recommendation to City Council regazding the proposed adoption of changes in Boulder Revisad Code 1981 Title 10-7 Energy Conservation and Insulation Code concerning a local amendment to the 2000 International Energy Conservation Code. REQUESTING DEPARTMENT: Public Works Maureen Rait, Director of Public Works for Development and Support Services Corey Schmidt, Chief Building Official FISCAL IMPACTS: N/A PURPOSE: Under the City Charter, any ordinance involving changes to the building codes, including the Energy Conservation Code, shall be scheduled for Planning Board review and consideration prior to action of the City Council. This item requests review of local amendments to the 2000 International Energy Conservation Code and proposes changes to those amendments adopted in B.R.C., 1981, Chapter 10-7. The proposed changes will affect energy compliance measures for residential additions, remodels and alterations, and the criteria used to establish design conditions for all new construction. BACKGROUND: In 2001, the City Council adopted the 2000 Intemational Energy Conservation Code (IECC) with local amendments. Those local amendments included administrative provisions requiring licensed professionals to perform the design and submit the applications demonstrating compliance. These same amendments included provisions that would reduce the burden on single family projects by exempting them from tha design professional requirement where certain publications were used to determine compliance. Commercial buildings would require s:\plan\pb-items~memos\csIECCPBPBmemo AGENDA ITEM # 6A, Paee #1 proof of compliance at time of final inspection from a licensed professional. Provisions were also included to add energy conservation measures for interior remodels from 501 to 2000 squaze feet and to also apply requirements where a remodel and a new addition were combined in one pro}ect. The energy conservation methods for remodels and new additions were dependent on square foot areas and percentages of existing floor areas. Interior remodels of 500 squaze feet or less were exempted. Demand controllers were required in electrically heated residential buildings and individual energy meters required in multi-family housing. Values for exterior design conditions (climate) were adopted. Glazing in south facing walls was exempted from area limitations. ANALYSIS: The currently proposed amendments (Attachment A) are intended to improve compliance with energy conservation, eliminate some contradictions where resource conservation is intended with the city residential green points programs, reduce confusion about remodels and additions, and correct the criteria used for design conditions. Those local amendments to the IECC that are currently in use have confused some applicants as to what provisions should apply to their project. While the IECC has options to demonstrate compliance, each option is specific to the work involved and does not require work or improvements to be made where none is proposed. Our adopted amendments grant some relief to, or penalize, applicants based on percentage of improvements. Any improvement of more than 50% of existing habitable space is required to improve to 100%. Interior improvements between 25% and 50% are allowed only one option for compliance and improvements up to 25% require only minimum insulation but the minimum threshold is unclear. Calculating these percentages is sometimes confusing and at times very difficult to determine what code provisions apply. An example is the interior remodel of an existing 2000 square foot home where 900 square feet aze to be remodeled - what code requirements apply? Where the proposed improvement exceeds 50%, we currently require 100% compliance. This implies that the entire structure must be de-constructed, adding to the waste stream and consuming additional resources. The proposed code changes intend to eliminate the interior remodel percentage process and to better clarify the intent of improved energy and resource conservation in existing buildings. Exterior design conditions, table 302.1, indicate heating degree-days (HDD) higher than our local offices of National Oceanic and Atmospheric Administration have yuoted us. By correcring the HDD we can assume two things - optimizing envelope performance and reducing the amount of construction material used to meet the old design conditions. This alone can improve compliance with energy conservation but especially with new additions or remodels. The prescriptive measures used to determine compliance create a big difference in envelope insulation and a small difference in window performance where the difference in HDD is very slight. These high R-values or thick insulation requirements have caused some builders to add more framing members by furring out ceilings and walls, eliminated a lot of choices in window frames, and prevented some very good insulating methods from being utilized. The proposed code changes provide design conditions specific to the city of Boulder. s:\plan\pb-items~memos\csIECCPBPBmemo AGENDA ITEM # 6A, Pase #2 Where additions aze less than 50% of the floor area (sec. 502.2.5) we currently allow 40% of the gross exterior wall and roof area to be windows or doors. We also then exempt the area of south facing glazing from this equation (sea 502.2.5 item 2). IF one were to build to this standard it might be difficult to find room for all of this glazing. The proposed code changes would reduce the amount of glazing allowed from 40% to 25% and require the south facing glazing to demonstrate some method of reducing heat loss or preventing an increased cooling load. Other proposed changes simply relocate and clarify the previously adopted amendments. PUBLIC PROCESS AND COMMENT: A meeting scheduled for July 1 Q 2002, including a cross section of stakeholders from builders, product suppliers and representatives, local Home Builders Association, Colorado E-Staz, engineers and architects, Housing Authority and Office of Environmental Affairs staff, will discuss in open forum all proposed changes. All comments and suggestions from this discussion group will be considered, whether in support of the changes or not. Such comments and suggestions will be included for City Council consideration. These same proposed amendments will be presented to the Environmental Advisory Board for review and comment on July 18, 2002. STAFF RECOMMENDATION: Staff requests that the Planning Board recommends that City Council adopt the proposed changes to B.R.C., 1981 Chapter 10-7. Approved By: ~Peter Pollock, lanning ' tor ATTACHMENTS: Attachment A: Proposed changes to B.R.C., 1981, Chapter 10-7 s:\plan\pb-items~nemos\csIECCPBPBmemo AGENDA ITEM # 6A, Paee #3 ATTACHMENT A TITLE 10 STRUCTURES Chapter 7 Energy Conservation and Insulation Code~ 'Adopted by Ordinance No. 4636. Amended by Ordinance Nos. 4984 and 5850. Derived from Ordinances Nos. 4236 and 4503. Repealed and reenacted by Ordinance No. 7141. 10-7-1 Legislative Intent. The purpose of this chapter is to protect the public health, safety, and welfare by encouraging the conservation of scarce energy resources through the regulation of building construction standards to minimize energy consumption for heating, cooling, lighting, and ventilating structures in the city and to encourage building design incorporating passive solar heating. 10-7-2 Energy Conservation Code. (a) Council adopts by reference the 2000International Energy Consarvation Code of the International Code Council with the amendments specified below: This chapter shall be administered in accordance with and as part of Chapter 10-5, "Building Code," B.R.C. 1981. ~b~ oe,.«:,.., i m~ n~,......r....,,e u: e..iva ...,a ..ee ..,..va .,. ..e„a .... c n,....,.. > > Add a new subsection 101.3.1.3 as follows: ~ r .......:......e.,,,.aer,. ,.acn~ ., ., c ,...,, i nnn .. „ F ,......a te,....w..„ ....e.,.,, > r~re n~Y~e«4 ~{~~.. :n4~n~ ~.n~.ihn~~.. nru..n n..e.~ .~«~~~ ~~m.~~~r ~~r~kti. 4~v «.ir~:«...«n :..,...1..4:..«. «,.....:«,.A 4.. :«....1..4.~ 41.e ev:,.ti«.....nll ..,...:4:en ..« ..e:l:.... n..e.... ....A «o.. s:\plan\pb-items~nemos\csIECCDRAFTamendJuly Agenda Item # ~>/~ Page #~_ • , > ..~ ..Fl...h;t..l.le ~~ .. «i. .:.~, .~,e ..r,. ,..: cn~ ~ c p ... 101.3.1.3 For all permit applications involving demolition, new construction and remodels/additions of residential buildings greater than 500 square feet, the compliance form will include a deconstruction checklist indicating waste reuse and recycling methods being proposed by the applicant. (c) Add a new section to 101.4.1 "Exempt buildings" as follows: 101.4.1.2 Remodels of existing buildings. For an interior remodel where the work authorized by a building permit per BRC,1981 Chapter 10-5 does not alter more than 500 square feet of the existing conditioned space. (~(d) Section 101.4.2.2, "Additions, alterations or repairs" is amended by adding the fallowing ~u~e-riev~ paragraphs: 1. Single family and multi-family dwellings in which 4he addition or remodel or both combined is fifty percent or more of the original square footage, the entire building must comply with the requirements of section 101:3.1 for new construction. New additions less than ~fty percent of existing building tloor area may choose any of the compliance provisions found in chapter 4 or 5 including prescriptive methods in section 502.2.5. Only the new addition is required to comply unless the method chosen for compliance includes energy conservation improvements in the existing lloor area necessary for the new area to comly. Remodels~~itieas-that are less than t~e fifty percent of original square footage ~ «e.7 4...«eek 4L.e « ......:..:...... 1:..4e.7 : e..k:..« cn~ may choose a compliance path as required in 101.3.1 or demonstrate improvements in the envelope where those framing elements are exposed during construction. Exposed wali framing cavities shall be insulated to their fullest depth but in no case shall the insulation R- value be less than R-13. Exposed or accessible tloor/ceiling assemblies, attics, basements and crawl spaces separating conditioned spaces from unconditioned spaces must be insulated to their fullest depth or, wherever possible, meet the prescriptive requirements of table 502.2.5. Replacement windows shall have a maximum U-Factor of 0.45. Replacement giazed doors shall meet or exceed the double glazed U-Factors per table 102.5.2(1). Replacement non-glazed doors shall meet or exceed the U-Factors described in table 102.5.2(2). Replacement building mechanical systems and equipment shall comply with Section 503 with the exception of 503.3.1 load calculations. Replacement service water heating equipment shall comply with section 504.2. Exposed service water heating pipes shall comply with section 504.5 for pipe insulation. All existing or new showerheads shall comply with section 504.6 for Conservation of hot water. For the purpose of this section, areas that are not conditioned tloor s:\plan\pb-items~xnemos\csIECCDRAFTamendJuly Agenda Item # ~~ Page # S areas and basements and attached garages are not to be considered when calculating the square footage of the existing structure. (~(e) A new section 101.5, "Demand Controllers Required in Electrically Heated Residential Buildings," is added: (a) All elecMcally heated residential buildings shall have an automatic demand controller installed in each dwelling unit or in each separately metered electrical system. An automatic demand controller is defined as a device that automatically regulates the use of major electrical appliances and controls electrical demand load without human intervention. (b) Individual energy meters are required for each dwelling unit in multi-family housing. (~ SECTION 104 CONSTRUCTION DOCMUMENTS is amended to read as follows: 104.2 General. Construction documents and other supporting data shall be submitted iu one or more sets with each application for a permit. The construction documents and designs submitted under the provisions of this ~chapter ~shall be prepared by ^~ :~•°°^a a^^:^° ~-^r^°°:^°^' iv1-exe ....a ti...ti~ ..~..t..to~ ,.v a~... : :~a:..~:,... : „w:..w 4~.,. .. .....:~ .,. ti.. eeestc~eteA~ and bear the stamp of a Colorado licensed professional engineer or architect. Documents submitted for the purposes of section 503.3.1 Load Calculations shall be submitted by a Colorado licensed engineer, architect or a professional who demonstrates the knowledge and experience to perform such calculations. Where special conditions exist, the code official is authorized to require additional construction documents to be prepared by a licensed professional. Exceptions: 1. The code official is authorized to waive the submission of construction documents and other supporting data not required to be prepared by a :°'^~^a -'°°:°° ^~^''°°°:^°^' licensed architect or engineer if it is found that the nature of the work applied for is such that reviewing of construction documents is not necessary to obtain compliance with this code. ~. ~;-:z~:~en~'°.,,;-Puildi:.gs-h;,~ieg~een~i~iened-tlw~-area-er6;A98 squnri ~,.,.. ,... io.... a....:...... n..1....:44n.1 ,,..~.,.. ~tio ., ..f rti....to.. ~ ~w..n ~.,. ~ Single family dwellings using the prescriptive approach in Chapter 6 or any of the design packages in Chapter 5 and submitting worksheets provided by t6e United States Dept. of Energy, International Code Council or the city manager. Agenda Item # G:~I Page # !o s: \plan\pb-items~nemos\cslE CCDRAFTamendJuly ~(g) Section 105.3, "Final Inspection," is amended by adding a new pazagraph to read: The applicant must provide at tnne of final inspection of a commercial building written verification which bears the stamp of a licensed architect or engineer or special inspector as described in section 106.3.5 of the 1997 Uniform Building Code that the structure conforms with the provisions of section 10132. (#~(h) Section 202, the definition of "Code Official" is repealed and reenacted to read: Code official is the city manager. (g3(i) Table 302.1, Exterior Design Conditions: Winter, Design Dry-bulb (°F) 8F Summer, Design Dry-bulb (°F) 91F Suimner, Design Wet-bulb (°F) 59F Degree days heating H9~ 5554 Degree days cooling ~-5- 649 Climate Zone 13b (-kj(j) Section 502.1.1, is amended by adding a second paragraph to read: Where the foundation walls, crawl space or similar areas are insulated, the ground shall be provided with a vapor barrier of four mil polyethylene or equivalent, lapped at least one foot at each joint and extending up the foundation wall a minimum of six inches. ~ ~(k) Section 502.2.5, "Prescriptive path for additions and window replacements," is repealed and reenacted to read: As an alternative to demonstrating compliance with Section 402 or 502.2, additions with a conditioned floor area less than fifty percent of the floor area as described in section 101.4.2.2 to the existing single family residential buildings and structures shall meet the prescriptive envelope component criteria in Table 502.2.5 for the designated heating degree days (HDD) applicable to the city. The U-factor of each individual fenestration product (windows, door and skylights) shall be used to calculate an area-weighted average fenestration product U-factor for the addition and the area weighted average shall not exceed the applicable listed values in Table 502.2.5. For additions, the tota] area of fenestration products shall not exceed €e~Ey twenty-live percent of the gross wall and roof area of the addition. The R-values for opaque thermal envelope components shall be equa] to or greater than the applicable listed values in Table 502.2.5. Replacement fenestration products (where the entire unit, including the frame, sash and glazing, is replaced) shall meet the prescriptive fenestration U-factar criteria in Table 502.2.5 for the designated HDD applicable to the city. s:\plan\pb-items~nemos\csIECCDRAFTamendJuly Agenda Item # ~c•~} Page #~_ 1. Replacement skylights shall have a maximum U-factor of 0.5. 2. There is no maximum area limitation on the amount of glazing that may be located in south facing walls provided: 1) the windows are provided with operable insulated shutters or other devices which, when drawn or closed, shall cause the window area to reduce maximum ouhvard heat flows in accordance with table 502.1.4.1 and 2) the window areas are shaded or otherwise protected from direct rays of t6e sun during periods when mechanical cooling is required. . As used herein, "south facing wall" means any glazed exterior wall that is oriented within thirty degrees of due south and not more than thirty degrees from the vertical. fj~}(1) Section 701.1, "General," is repealed anc3 reenacted to read: Commercial buildings shall meet the requirements of ASHRAE/IES 1999 Energy Code for Commercial and High-Rise Residential Buildings. Exception: Commercial buildings that comply with Chapter 8. Ordinance No. 7172 (2001). s:\plan\pb-items\memos\csIECCDRAFTamendJuly Agenda ltem # Lo/~ Page #~