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.
Course
Description
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.
Learning
Objectives
At the end of the this course, participants will be able to:
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.
IECC 2012 Commercial Energy code update
Commercial Envelope
Statewide Code Compliance June 1st 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 ft2) spaces w/ tall (15’)
ceilings;
• Continuous air barrier requirement for most buildings –
Mandatory
• Hints for compliance
• Details – We can do better!
6
Resources
Published by: International Codes Council
10
11
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.
• Statewide Code Compliance June 1st 2014
IECC Compliance - Two Climate Zones
 Iowa Has Two Climate Zones


Zone 5
Zone 6
12
IECC Compliance - Three Options
Prescriptive
U-Factor and
“UA”
Alternatives
Simulated
Performance
(software)
R-values
Table R402.1.1
U-factor
Table C402.2
R402.1.3 - REScheck
C402.3 - COMcheck
Simulated
Performance
Alternative
R405 - REMrate
C407 – DOE II
 There are three paths of Compliance



Prescriptive
Trade-off
Performance
13
Structure of the 2012 IECC
Commercial
Section
Residential
Section
Ch. 1 C101 - Scope and Application /
Administrative and
Enforcement
Ch. 1
Ch. 2 C201 - Definitions
Ch. 2
Ch. 3
Ch. 4
Ch. 3 C301 - General Requirements
Ch. 4 C401 - Commercial Energy Efficiency
Ch. 5 C501 - Referenced Standards
Index
Ch. 5
Index
R101 - Scope and Application
/Administrative and
Enforcement
R201 - Definitions
R301 - General Requirements
R401 - Residential Energy
Efficiency
R501 - Referenced Standards
14
Building Types
C 101.4 - Applicability – What is NOT covered under this
code:

C101.4.1 - Historic Buildings – State, National or Local historic
property

C101.4.3 – Exceptions for Additions, Alterations, Renovations
or Repairs

Exceptions – 1 to 8

C101.4.6 – Mixed occupancy – Where the building is covered
by the IECC Residential Provisions

C101.5.2 – Low Energy Buildings – with energy use below 3.4
Btu/h Sf of floor area for space conditioning purposes.
15
Building Types
C101.4.3 – Exceptions for Additions, Alterations, Renovations or
Repairs
16
Structure of the 2012 IECC
Commercial Energy Efficiency
Chapter 4 (CE)
17
Building Envelope

Building Envelope consists of:
 Fenestration
 Ceilings
 Walls
 Above
grade
 Below grade
 Mass walls
Conditioned space
 Floors
 Slab
 Crawl
space
18
2012 Commercial IECC
Mandatory Requirements
Mandatory Sections Regardless of Compliance Path

C402.4 Air Leakage – With sections C402.4.1 through C402.4.8

Typo on C402.4.1.1 paragraph 3 recessed lighting fixtures
shall comply with section C402.4.8

C403.2 Provisions applicable to all mechanical systems – With
sections C403.2.1 through C403.2.11

C404 Service Water Heating – With sections C404.1 through
404.7.3
Cont…..
19
2012 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 C405.2.1,
C405.2.2, C405.2.3 and C405.2.4

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 C403.2.9
20
2012 Commercial Insulation and
Fenestration by Climate Zone - Prescriptive
Table C402.2
21
2012 Commercial Insulation and
Fenestration by Climate Zone - Prescriptive
Table C402.3
22
2012 Commercial Compliance Approach
Trade-off Method
Use when the envelope assemblies don’t fit in the prescriptive
table




Works for 95% of
all projects
Trades off over
insulated areas for
under-insulated
areas
Free and simple
program
Tied to table
C402.2
23
2012 Commercial Compliance Approach
Trade-off Method


Don’t try to
calculate the
assembly U-value
COMcheck does
this MUCH better!
2012 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 90.1 2010, Section 11.1 outlines the Energy Cost
Budget Method. ASHRAE 90.1 2010 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 90.1 2007 Energy Cost Budget Method,
the other methods can be used, only with prior approval. 25
Vertical Fenestration Requirement
C402.3.1 – Prescriptive (Max area)
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
26
Increased Vertical Fenestration with
Daylighting Controls – Prescriptive
C402.3.1.1

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
27
Skylight Minimum Fenestration
Area
C402.3.1.2 Prescriptive


Limited to ≤ 3% of Roof Area
Up to 5% allowed if automatic
daylighting controls installed in daylight
zones under skylights
28
Minimum Skylight Fenestration
Area
C402.3.2 – Prescriptive

In certain types of enclosed spaces > 10,000 ft2
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
2
 Spaces with LPDs < 0.5 W/ft
 Documented shaded spaces
 Daylight area under rooftop monitors is > 50% of
floor area
29
Lighting Controls in Daylight
Zones – Under Skylights
C402.3.2.1 – Prescriptive

All lighting in the daylight zone shall be
controlled by multilevel lighting controls
that comply with C405.2.2.3.3
Exceptions:




Climate zones 6-8
Spaces with LPDs < 0.5 W/ft2
Documented shaded spaces
Daylight area under rooftop monitors is
> 50% of floor area
30
Increased Skylight SHGC
C402.3.3.3

In Climate Zones 1-6, skylights above
daylight zones with automated
daylight controls are permitted a
maximum SHGC of 0.60
31
Increased Skylight U-Factor
C402.3.3.4 – 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
32
New and Improved!!! And required regardless of compliance path!
Air Barriers and Construction
C402.4.1 and C402.4.1.1 –
(Mandatory)
33
Air Barriers and Construction
C402.4.1 and C402.4.1.1 - Mandatory
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 C402.4.2
Recessed lighting to comply with C404.2.8.
Where similar objects are installed that penetrate the air barrier,
make provisions to maintain the air barrier’s integrity
34
Air Barrier Compliance Options
C402.4.1.2 - Mandatory
Three ways to comply with air barrier requirements



Materials
Assemblies
Building
35
Air Barrier Materials (Compliance)
C402.4.1.2.1 - Mandatory
Materials with air permeance ≤ 0.004 cfm/ft2 under pressure differential of 0.3 in.
w.g. tested in accordance with ASTM E 2178
These materials meet this requirement:
Material
Thickness
(minimum)
Plywood
3/8 in.
Oriented strand board
3/8 in.
Extruded polystyrene insulation board
½ in.
Foil-faced urethane insulation board
½ in.
Closed cell spray foam minimum density of 1.5 pcf
1-1/2 in.
Open cell spray foam density between 0.4 and 1.5 pcf
4.5 in.
Exterior gypsum sheathing or interior gypsum board
½ in.
Cement board
½ in.
Built up roofing membrane
Modified bituminous roof membrane
Fully adhered single-ply roof membrane
A Portland cement/sand parge, stucco, or gypsum plaster
5/8 in.
Cast-in-place and precast concrete
Sheet metal or aluminum
36
Air Barrier Assemblies (Compliance)
C402.4.1.2.2
OR
Assemblies of materials and components (sealants,
tapes, etc.) with average air leakage ≤ 0.04 cfm/ft2
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

37
Air Barrier Building Test (Compliance)
C402.4.1.2.3
OR
Air leakage rate of completed building tested and confirmed to
not exceed 0.40 cfm/ft2 at a pressure differential of 0.3 inches
water gauge per ASTM E779 or equivalent method approved by
code official
38
Air Leakage
C402.4.2 to C402.4.8 ( Mandatory)
C402.4.2 Air Barrier Penetrations
 Penetrations of the air barrier and paths of air leakage shall be
caulked, gasketed or otherwise sealed.
C402.4.3 Air Leakage of Fenestration
 Shall meet Table C402.4.3 and tested to referenced standard.
C402.4.4 Doors and Access Openings to Shafts, Stairways etc.
 Shall meet either C402.4.3 or shall be gasketed, weather stripped or
sealed
C402.4.5 Air Intakes, Exhausts, Stairways and Shafts
 Shall be provided with dampers in accordance with C402.4.5.1 &2
C402.4.6 Loading Dock Weatherseals
C402.4.7 Vestibules
 Required from a space 3,000 Sf in area or more.
C402.4.8 Recessed Lighting
 All recessed luminaires shall be IC-rated and labeled as having a
leakage rate of not more than 2.0 cfm@75 Pa
39
Additional Efficiency
Requirements - Prescriptive

One Additional Efficiency
Feature Must Be Selected
to Comply with the IECC



More efficient lighting
system (consistent with
90.1-2010), or
More efficient HVAC system
Installation of onsite
renewables

High Efficiency HVAC
More Efficient Lighting System
3% of the regulated energy
Onsite Renewables 41
Energy Code Plan Review
What you need to know to pass the first time
42
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!
43
Specifications to Review
Specification Sections Always Under Review
 Section 07 2100 Thermal Insulation
 Section 07 5300 Elastomeric Membrane Roofing
 Section 07 7200 Roofing Accessories
 Section 08 4113 Aluminum-Framed Entrances and Storefronts
 Section 08 4413 Glazed Aluminum Curtain Walls
 Section 08 4523 Translucent Fiberglass Sandwich Panel
 Section 23 0719 HVAC Pipe Insulation
 Section 22 0719 Pipe Insulation
44
Specifications to Review
Section 07 2100 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.
2.02 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 E84.
2. Smoke Developed Index: 450 or less, when tested in accordance with ASTM
E84.
3. Board Size: 48 x 96 inch.
4. Board Thickness: As indicated
45
Specifications to Review
Section 07 5300 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.
46
Specifications to Review
Section 07 7200 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 12.
3. 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.
47
48
Specifications to Review
Section 08 1113 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-102.
2. Conductive thermal transmittance fixed unit assembly (U-Value) shall not be more than 0.37
BTU/hr•ft²•ºF when glazed with 1 inch insulated - 1/4 inch clear low emissivity, 1/2 inch air, 1/4 inch
clear glass.
49
Specifications to Review
Section 07 4523 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 0.18.
4. Panel U-factor by NFRC certified laboratory: 2-3/4” thermally broken grid
0.14.
5. Complete insulated panel system shall have NFRC certified U-factor of 0.20.
50
Specifications to Review
Section 23 0719 HVAC Pipe Insulation
Section 22 0719 Pipe Insulation
51
Energy Code Plan Review
Standard Details – We can do better!
52
Department of Energy Slab on Grade Details
53
Bad Practice –
Non Thermally Broken Slabs
54
Bad Practice –
What the?
Bad Practice –
Parapet Thermal Bridge
57
Bad Practice –
Thermal Energy can rise?
Bad Practice –
Attic Knee Walls - Undetailed
Attic Outside Walls
59
60
Building Science Corp’s Perfect
Commercial Wall
61
Bad Practice –
Missing Insulation
62
Resources
www.energycodes.gov
ICCSAFE.ORG
Buildingscience.org
67
Questions
68
This concludes The American Institute of Architects
Continuing Education Systems Course
AIA Iowa
Contact Information