Credit(s) earned on completion of this course will be reported to AIA CES for AIA members. Certificates of Completion for both AIA members and non-AIA members are available upon request. This course is registered with AIA CES for continuing professional education. As such, it does not include content that may be deemed or construed to be an approval or endorsement by the AIA of any material of construction or any method or manner of handling, using, distributing, or dealing in any material or product. _______________________________________ ____ Questions related to specific materials, methods, and services will be addressed at the conclusion of this presentation.

The State of Iowa has adopted the 2012 International Energy Conservation Code, we will look at the 2012 IECC and how the code impacts the commercial building envelope. Course Description

Learning Objectives 1. The participant will be able to identify the climate zone for the project location and choose the path of compliance that is appropriate with their design. 2. The 2012 International Energy Conservation Code will be compared to the 2009 and how they impact the building envelope. 3. Misconceptions, pitfalls and missed information critical to a complete COMcheck will be discussed. We will expolore presenters experience with COMcheck reviews over the past four years as well as details that need to be updated. At the end of the this course, participants will be able to:

IECC 2012 Commercial Energy code update Commercial Envelope Statewide Code Compliance June 1 st 2014

Introduction David Ruffcorn, AIA Design/Energy Engineer Iowa State Fire Marshal’s Office Building Code Bureau

Commercial Energy Code Summary Energy Codes 101 Paths of compliance Increased prescriptive insulation requirements – Table C402.2 Manual daylighting controls for buildings seeking 30% < WWR ≤ 40%; Skylights/daylighting for large (>10,000 ft 2 ) spaces w/ tall (15’) ceilings; Continuous air barrier requirement for most buildings – Mandatory Hints for compliance Details – We can do better! 6

Resources 10 Published by: International Codes Council

100,000 CF Statement Review required by an Architect or Engineer Review Required. The plans and specifications for all buildings to be constructed which exceed a total volume of 100,000 cubic feet of enclosed space that is heated or cooled shall be reviewed by a registered architect or licensed professional engineer for compliance with applicable energy efficiency standards. 11 Statewide Code Compliance June 1 st 2014

12 IECC Compliance - Two Climate Zones  Iowa Has Two Climate Zones  Zone 5  Zone 6

U-Factor and “UA” Alternatives Simulated Performance (software) Prescriptive R-values Table R Table C402.2 Simulated Performance Alternative R405 - REMrate C407 – DOE II U-factor R REScheck C COMcheck IECC Compliance - Three Options 13  There are three paths of Compliance  Prescriptive  Trade-off  Performance

Structure of the 2012 IECC 14 Ch. 1C101 - Scope and Application / Administrative and Enforcement Ch. 2C201 - Definitions Ch. 3C301 - General Requirements Ch. 4C401 - Commercial Energy Efficiency Ch. 5C501 - Referenced Standards Index Residential Section Ch. 1R101 - Scope and Application /Administrative and Enforcement Ch. 2R201 - Definitions Ch. 3R301 - General Requirements Ch. 4R401 - Residential Energy Efficiency Ch. 5R501 - Referenced Standards Index Commercial Section

15 Building Types C Applicability – What is NOT covered under this code:  C Historic Buildings – State, National or Local historic property  C – Exceptions for Additions, Alterations, Renovations or Repairs  Exceptions – 1 to 8  C – Mixed occupancy – Where the building is covered by the IECC Residential Provisions  C – Low Energy Buildings – with energy use below 3.4 Btu/h Sf of floor area for space conditioning purposes.

16 Building Types C – Exceptions for Additions, Alterations, Renovations or Repairs

Structure of the 2012 IECC 17 Commercial Energy Efficiency Chapter 4 (CE)

Building Envelope 18  Building Envelope consists of:  Fenestration  Ceilings  Walls Above grade Below grade Mass walls  Floors  Slab  Crawl space Conditioned space

Commercial IECC Mandatory Requirements Mandatory Sections Regardless of Compliance Path  C402.4 Air Leakage – With sections C through C  Typo on C paragraph 3 recessed lighting fixtures shall comply with section C  C403.2 Provisions applicable to all mechanical systems – With sections C through C  C404 Service Water Heating – With sections C404.1 through Cont…..

Commercial IECC Mandatory Requirements Mandatory Sections Regardless of Compliance Path  C405 Electrical Power and Lighting Systems – With Mandatory Sections  C405.2 Lighting controls – With sections C , C , C and C  C405.3 Tandom Wiring  C405.4 Exit Signs  C405.6 Exterior Lighting  C405.7 Electrical Energy Consumption – Multi-Family  C 408 Commissioning  Mandatory from section C

2012 Commercial Insulation and Fenestration by Climate Zone - Prescriptive 21 Table C402.2

Commercial Insulation and Fenestration by Climate Zone - Prescriptive Table C402.3

Commercial Compliance Approach Trade-off Method  Works for 95% of all projects  Trades off over insulated areas for under-insulated areas  Free and simple program  Tied to table C402.2 Use when the envelope assemblies don’t fit in the prescriptive table

2012 Commercial Compliance Approach Trade-off Method  Don’t try to calculate the assembly U-value  COMcheck does this MUCH better!

Commercial Compliance Approach Performance Method State Requirements for Performance Energy Modeling  Department of Energy DOEII – Energy Modeling Engine Software  Free and simple programs, Energy Plus, eQUEST, EPquick OpenStudio Etc.  The International Energy Conservation Code 2012 Section C407 outlines the Total Building Performance Method and ASHRAE , Section 11.1 outlines the Energy Cost Budget Method. ASHRAE Appendix G can be used in specific circumstances but each project will need to be approved before using this method. The preferred method in Iowa is the ASHRAE Energy Cost Budget Method, the other methods can be used, only with prior approval.

Vertical Fenestration Requirement C – Prescriptive (Max area) 26 Percentage of Vertical Fenestration Area to Gross Wall Area  Allowed up to 30% maximum of above grade wall  In Climate Zones 1-6, up to 40% maximum of above grade wall with daylighting controls

Increased Vertical Fenestration with Daylighting Controls – Prescriptive C  Up to 40% vertical fenestration area allowed in Climate zones 1-6, provided  No less than 50% of the conditioned floor area is within a daylight zone  Automatic daylighting controls are installed in daylight zones; and  Visual Transmittance of vertical fenestration is ≥ 1.1 times SHGC Exception: Fenestration that is outside the scope of NFRC 200 isn’t required to comply with VT

28 Skylight Minimum Fenestration Area C Prescriptive  Limited to ≤ 3% of Roof Area  Up to 5% allowed if automatic daylighting controls installed in daylight zones under skylights

Minimum Skylight Fenestration Area C – Prescriptive 29  In certain types of enclosed spaces > 10,000 ft 2 directly under a roof with ceiling heights > 15 ft  total daylight zone under skylights to not be < ½ the floor area and to provide a minimum skylight area to daylight zone of either Minimum of 3% of roof area with a skylight VLT at least 0.40 OR Provide a minimum skylight effective aperture of at least 1% Exceptions  Climate zones 6-8  Spaces with LPDs < 0.5 W/ft 2  Documented shaded spaces  Daylight area under rooftop monitors is > 50% of floor area

30 Lighting Controls in Daylight Zones – Under Skylights C – Prescriptive  All lighting in the daylight zone shall be controlled by multilevel lighting controls that comply with C Exceptions:  Climate zones 6-8  Spaces with LPDs < 0.5 W/ft 2  Documented shaded spaces  Daylight area under rooftop monitors is > 50% of floor area

31 Increased Skylight SHGC C  In Climate Zones 1-6, skylights above daylight zones with automated daylight controls are permitted a maximum SHGC of 0.60

32 Increased Skylight U-Factor C – Prescriptive  Skylights above daylight zones with automated daylight controls are permitted a maximum U-factor of – 0.9 in Climate Zones 1-3 – 0.75 in Climate Zones 4-8

33 Air Barriers and Construction C and C – (Mandatory) New and Improved!!! And required regardless of compliance path!

34 Continuous air barrier required in:  Iowa’s climate zones 5 & 6 Air barrier requirements:  Placement allowed  Inside of building envelope  Outside of building envelope  Located within assemblies composing envelope OR  Any combination thereof  Continuous for all assemblies part of the thermal envelope and across joints and assemblies  Joints and seams to be sealed per C  Recessed lighting to comply with C  Where similar objects are installed that penetrate the air barrier, make provisions to maintain the air barrier’s integrity Air Barriers and Construction C and C Mandatory

35 Three ways to comply with air barrier requirements  Materials  Assemblies  Building Air Barrier Compliance Options C Mandatory

36 Materials with air permeance ≤ cfm/ft 2 under pressure differential of 0.3 in. w.g. tested in accordance with ASTM E 2178 These materials meet this requirement: Air Barrier Materials (Compliance) C Mandatory MaterialThickness (minimum) Plywood3/8 in. Oriented strand board3/8 in. Extruded polystyrene insulation board½ in. Foil-faced urethane insulation board½ in. Closed cell spray foam minimum density of 1.5 pcf1-1/2 in. Open cell spray foam density between 0.4 and 1.5 pcf4.5 in. Exterior gypsum sheathing or interior gypsum board½ in. Cement board½ in. Built up roofing membrane Modified bituminous roof membrane Fully adhered single-ply roof membrane A Portland cement/sand parge, stucco, or gypsum plaster5/8 in. Cast-in-place and precast concrete Sheet metal or aluminum

37 OR Assemblies of materials and components (sealants, tapes, etc.) with average air leakage ≤ 0.04 cfm/ft 2 under pressure differential of 0.3 in. w.g. tested in accordance with ASTM E 2357, 1677 or 283 These assemblies meet this requirement:  Concrete masonry walls coated with one application either of block filler and two applications of a paint or sealer coating OR  Portland cement/sand parge, stucco or plaster minimum ½ thick Air Barrier Assemblies (Compliance) C

38 OR Air leakage rate of completed building tested and confirmed to not exceed 0.40 cfm/ft 2 at a pressure differential of 0.3 inches water gauge per ASTM E779 or equivalent method approved by code official Air Barrier Building Test (Compliance) C

39 Air Leakage C to C ( Mandatory) C Air Barrier Penetrations  Penetrations of the air barrier and paths of air leakage shall be caulked, gasketed or otherwise sealed. C Air Leakage of Fenestration  Shall meet Table C and tested to referenced standard. C Doors and Access Openings to Shafts, Stairways etc.  Shall meet either C or shall be gasketed, weather stripped or sealed C Air Intakes, Exhausts, Stairways and Shafts  Shall be provided with dampers in accordance with C &2 C Loading Dock Weatherseals C Vestibules  Required from a space 3,000 Sf in area or more. C Recessed Lighting  All recessed luminaires shall be IC-rated and labeled as having a leakage rate of not more than 2.0 Pa

41  One Additional Efficiency Feature Must Be Selected to Comply with the IECC  More efficient lighting system (consistent with ), or  More efficient HVAC system  Installation of onsite renewables  3% of the regulated energy High Efficiency HVAC Additional Efficiency Requirements - Prescriptive More Efficient Lighting System Onsite Renewables

Energy Code Plan Review What you need to know to pass the first time 42

43 Plan Review Submittal - Hints What’s needed to pass Energy Code Plan Review…..  Complete drawings, specifications and Energy Code documentation.  The drawings, specifications and Energy Code must contain the same information. Architectural and MEP must use same code.  Storefront windows and doors have different U-values so they must be specified in two locations.  Update your standard specification – Construction materials change over the years so should your specification.  COMcheck is only interested in the location and listed value of your insulation. Mechanical and Electric are really spread sheets.  The values listed in your COMcheck should be in the specification or drawings exactly as noted.  Update your standard details – We can do better!

Specifications to Review 44 Specification Sections Always Under Review  Section Thermal Insulation  Section Elastomeric Membrane Roofing  Section Roofing Accessories  Section Aluminum-Framed Entrances and Storefronts  Section Glazed Aluminum Curtain Walls  Section Translucent Fiberglass Sandwich Panel  Section HVAC Pipe Insulation  Section Pipe Insulation

45 Specifications to Review Section Thermal Insulation PART 2 PRODUCTS 2.01 APPLICATIONS A. Rigid Insulation Under Concrete Slabs: Extruded or expanded polystyrene board. B. Rigid Insulation at Perimeter of Foundation: Extruded or expanded polystyrene board. C. Rigid Insulation Inside Masonry Cavity Walls: Extruded or expanded polystyrene board FOAM BOARD INSULATION MATERIALS A. Extruded Polystyrene Board Insulation: ASTM C 578, Type IV; Extruded polystyrene board with either natural skin or cut cell surfaces; with the following characteristics: 1. Flame Spread Index: 25 or less, when tested in accordance with ASTM E Smoke Developed Index: 450 or less, when tested in accordance with ASTM E Board Size: 48 x 96 inch. 4. Board Thickness: As indicated

46 Specifications to Review Section Elastomeric Membrane Roofing PART 2 PRODUCTS 2.04 INSULATION A. Polyisocyanurate Board Insulation: Rigid cellular foam, complying with ASTM C1289, Type II, Class 2, polymer bonded glass fiber mat both faces and with the following characteristics: 1. Board Thickness: 1.5 inch. 2. Board Edges: Square. 3. Tapered Units: Provide factory-tapered insulation boards fabricated to slope of 1/4 inch per 12 inches unless otherwise indicated. 4. Provide composite boards with oriented strand board laminated to one side in lieu of cover board when required by manufacturer to meet system warranty requirements.

47 Specifications to Review Section Roof Accessories PART 2 PRODUCTS 2.04 INSULATION 2.02 ROOF HATCHES A. Manufacturers - Roof Hatches: 1. Basis-of-Design: Bilco Co., Enhanced Performance E-50T. a. Subject to compliance with the specified requirements, provide the basis-of-design product or a comparable product approved by the Architect, prior to bid. B. Roof Hatches: Factory-assembled steel frame and cover, complete with operating and release hardware. 1. Style: Provide flat metal covers unless otherwise indicated. 2. Mounting: Provide frames and curbs suitable for mounting on corrugated metal roof deck. 3. Size: 36" x 36" 4. Loads: Fabricate roof hatches to withstand 40-lbf/sq. ft. external and 20-lbf/sq. ft. internal loads. C. Frames/Curbs: One-piece curb and frame with integral cap flashing to receive roof flashings; extended bottom flange to suit mounting. 1. Material: Aluminum,.090 inch thick. 2. Insulation: 2 inch thick polyisocyanurate board with R-value of Interior Lid Liner: Manufacturer's standard metal liner of same material and finish as metal curt. 4. Exterior Curb Liner: Manufacturer's standard metal liner of same material and finish as metal curb. 5. Curb Height: 12 inches from surface of roof deck, minimum.

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49 Specifications to Review Section Aluminum-Framed Entrances and Storefronts 1.02 Performance Requirements A. General Performance: Aluminum-framed systems shall withstand the effects of the following performance requirements without exceeding performance criteria or failure due to defective manufacture, fabrication, installation, or other defects in construction: 1. Movements of supporting structure indicated on Drawings including, but not limited to, story drift and deflection from uniformly distributed and concentrated live loads. 2. Dimensional tolerances of building frame and other adjacent construction. 3. Failure includes the following: a. Deflection exceeding specified limits. b. Thermal stresses transferring to building structure. c. Framing members transferring stresses, including those caused by thermal and structural movements to glazing. d. Noise or vibration created by wind and by thermal and structural movements. e. Loosening or weakening of fasteners, attachments, and other components. f. Failure of operating units. B. Wind Loads: As indicated on Drawings. C. Deflection of Framing Members: 1. Deflection Parallel to Glazing Plane: Limited to L/360 of clear span or 1/8 inch, whichever is smaller. D. Air Infiltration: Provide aluminum-framed systems with maximum air leakage through fixed glazing and framing areas of 0.06 cfm/sq. ft. of fixed wall area when tested according to ASTM E 283 at a minimum static-air-pressure difference of 6.24 lbf/sq. ft. E. Thermal Transmittance Test (Conductive U-Value) 1. Test in accordance with NFRC Conductive thermal transmittance fixed unit assembly (U-Value) shall not be more than 0.37 BTU/hrft²ºF when glazed with 1 inch insulated - 1/4 inch clear low emissivity, 1/2 inch air, 1/4 inch clear glass.

50 Specifications to Review Section Translucent Fiberglass Sandwich Panel PART 2 PRODUCTS 2.04 Panel Construction A. Provide sandwich panels of flat fiberglass reinforced translucent face sheets laminated to a grid core of mechanically interlocking I-beams. The adhesive bonding line shall be straight, cover the entire width of the I-beam and have a neat, sharp edge. 1. Thickness: 2-3/4” 2. Light transmission: 12-15% 3. Solar heat gain coefficient Panel U-factor by NFRC certified laboratory: 2-3/4” thermally broken grid Complete insulated panel system shall have NFRC certified U-factor of 0.20.

51 Specifications to Review Section HVAC Pipe Insulation Section Pipe Insulation

52 Energy Code Plan Review Standard Details – We can do better!

53 Department of Energy Slab on Grade Details

54 Bad Practice – Non Thermally Broken Slabs

Bad Practice – What the?

57 Bad Practice – Parapet Thermal Bridge

Bad Practice – Thermal Energy can rise?

59 Attic Outside Walls Bad Practice – Attic Knee Walls - Undetailed

60

Building Science Corp’s Perfect Commercial Wall 61

62 Bad Practice – Missing Insulation

67 Resources ICCSAFE.ORG Buildingscience.org

68 Questions

This concludes The American Institute of Architects Continuing Education Systems Course AIA IowaContact Information