why building and energy codes? - iccmedia.iccsafe.org/geo/docs/whybuildingenergycodes.pdf ·...
TRANSCRIPT
Why Building and Energy Codes?
Consumer Expectations When you purchased your home or commercial building did you have any expectations of how the structure would perform?
Many would expect that when
• It rained the inside would stay dry
Many would expect that when
• It snowed the roof would support the added weight
Many would expect that when
• It was windy the building would stand
Many would expect that when
• You turned on the faucet there was hot water and it was on the left side
Many would expect
• That the drains drain
Many would expect that
• It would be reasonably comfortable
Building and Energy Codes Intent:
The purpose of any of the International family of codes is to establish minimum requirements to safeguard the public safety, health and general welfare through;
Building and Energy Codes
• Affordability
Building and Energy Codes
• Structural strength
Building and Energy Codes
• means of egress facilities
Building and Energy Codes
• energy conservation
Building and Energy Codes
• stability
Building and Energy Codes
• sanitation
Building and Energy Codes
• light and ventilation
Building and Energy Codes
• safety to life and property from fire and other hazards
Living up to the expectation
• So what are some things that we can be doing to our buildings so that they live up to the expectations of those who buy them?
1. Define the Thermal Envelope
2. Protect the Thermal Envelope
Air Barriers
Air Leakage
• The following shall be caulked, gasketed, weather-stripped or otherwise sealed with an air barrier material, suitable film or solid material:
#1 All joints, seams and penetrations.
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#1 All joints, seams and penetrations.
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#2 Site-built windows, doors or skylights
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#2 Site-built windows, doors or skylights
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#3. Openings between window and door assemblies and their respective jambs and framing.
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#3 Openings between window and door assemblies and their respective jambs and
framing.
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From Building Science Corp.
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www.buildingscience.com
#4 Utility penetrations.
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#5 Dropped ceilings or chases adjacent to the thermal envelope
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#6 Knee Walls
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#7 Walls and ceilings separating a garage from a conditioned spaces.
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#7 Walls and ceilings separating a garage from a conditioned spaces.
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#8 Behind tubs and showers on exterior walls
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#8 Behind tubs and showers on exterior walls
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#9 Common walls between dwelling units
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The Problem
#10 Attic access openings
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Courtesy of US Department of Energy
WB 44
#11 Rim joist junction
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BuildingsScience.com
WB 44
#12 Other sources of infiltration
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Glazing
Ceiling Insulation
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Ceiling/Roof Insulation
Ceiling Insulation
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Ceiling Insulation
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Roof Assemblies - Metal Buildings
Example: • Climate Zones 6 requires two
layers of insulation (R-13 + R-19) Per Table 502.2(1)
Per Table 502.2(2):
• R-13 faced fiberglass batts draped over purlins.
• R-19 unfaced fiberglass batts installed parallel to the purlins.
• Minimum R-3.5 thermal spacer block placed above the purlin/batt, and roof deck is secured to purlins.
Thermal Blocks
Insulation
Draped Over
Purlin
Insulation
Parallel to Purlin
Picture from NAIMAThermal Blocks
Insulation
Draped Over
Purlin
Insulation
Parallel to Purlin
Picture from NAIMA
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Roof/Ceiling Insulation
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Roof/Ceiling Insulation
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Roof/Ceiling Insulation
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Wall Insulation
Wall Insulation
Wall Insulation
OOPS!
Above Grade Walls
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Above Grade Walls
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Floor Insulation Floor insulation shall be installed to maintain permanent contact with the underside of the subfloor decking.
Floors Over Outside Air
Slab on Grade Foundations
NO
Slab Edge Protection
Basements
Vented Crawl Spaces
Unvented Crawl Spaces
Attics
Garages
2. Size the mechanical equipment properly
Residential Mechanical
• Houses are tighter than they used to be
• Insulation is better than it used to be
• Windows are better than they used to be
• It becomes more important to put more thought into the size of equipment needed for a home. The old “Rule of Thumb” just doesn’t cut it anymore.
Commercial Mechanical
• “Control Issues” : Commercial mechanical equipment should be designed with controls with capabilities to:
• Turn things down or off when not needed, • Have programmable thermostats that allow varied
settings and abilities to operate equipment during power failures
• Reduce outside air when it’s not required • Provide outside air instead of chilled air when it is
economical to do so • Sequencing operations on multiple units • Reduce pump flows when applicable • Change fan speeds when applicable
Duct Leakage and Insulation
Seal all joints and seams
Ducts in unconditioned spaces need insulation!
Duct Design
• You designed your equipment to the way you built your building, now design the ducts to deliver the air appropriately.
• When you don’t feel the right amount of air from your duct work, you turn up the heat or cooling. What you need to do is design the duct work correctly from the beginning.
3. Lighting
• Recessed lighting installed in the building’s thermal envelope should be rated to be in contact with insulation (IC rated)
• And should have seals and gaskets to limit air leakage.
Residential Lighting
• Use high efficacy bulbs in your permanent fixtures.
Commercial Lighting
• More “Control Issues”: Commercial lighting should be designed to allow the user to turn the lights down by at least 50% when they can. This can be done with dimmer switches, controls that allow you to shut some lamps off and not others, or occupancy sensors
• Also, controls should be provided to allow for holiday scheduling and after hour shutoffs.
• Always have at least one control for the lighting in each room the lighting serves. Don’t make me go into another room to turn the lights on for the room I need to be in.
• Exterior lighting should have controls that shut it off when it’s light enough outside that you don’t need it
• And then put some thought into which occupancies need more wattage than others and design appropriately.
Pools
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If you heat your pool To over 90 degrees, it Should have an insulated cover
Flexibility and Options
• ResCheck/ComCheck
• Performance Path
• ASHRAE 90.1
Free Adoption Assistance
• Need help with code adoption?
• Have questions about code adoption?
• Want someone to talk to your City Council?
• Want someone to attend public meetings to answer questions?
• Give us a call, we can help – for FREE!
Shaunna Mozingo, (303)598-3465
Thank you!!
Energy Code Support Partnership
Brought to you by:
Colorado Governor’s Energy Office
Department of Local Affairs, Div. of Housing
Colorado Code Consulting
International Code Council
Energy Logic