what’s new in the 2015 residential iecc/irc?2015... · what’s new in the 2015 residential...

What’s new in the 2015 Residential IECC/IRC?

1 DiSanto Builders

ICF Specialist

City of Scottsdale IECC Adoption Effective Date – January 1, 2017

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Building thermal envelope must be represented on the

construction documents easily depicted on floor plan

and building sections

Information for Construction Documents

2015 IECC/IRC Major Residential Changes

2 N1101.5.1 (R103.2.1)

Presenter

Presentation Notes

Gas furnaces and water heaters shall be either sealed combustion units or located in isolated/air sealed mechanical room(s) with an outside source of combustion air.

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Sequence of Inspections Footing and foundation Framing and rough-in Plumbing rough-in Mechanical rough-in Final inspection

Enhanced Inspections


Recognition of third-party inspection agencies not affiliated with the building design or construction

R104.2

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Not exceeding 5 air changes per hour for detached dwelling units Not exceeding 7 air changes per

hour for attached dwelling units (Scottsdale amendment)

N1102.4.1.2 (R402.4.1.2)


Building or dwelling unit shall be tested and verified for Climate Zone 2 as having an air leakage rate -

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Presentation Notes

Whole-house pressure test section includes instructions for setting up. For example: Exterior windows and doors, fireplace and stove doors to be closed but not sealed. Field verification states that the code official can require an approved party, independent from the insulation installer, inspect the air barrier and insulation. Whole house testing will be required in 2012. ACH50 will be lower. When a building becomes so tight, must train on mechanical ventilation.

2015 IECC/IRC Implementation and Compliance

R104.4 Approved Inspection Agencies The code official is authorized to accept reports of third-party inspection agencies not affiliated with the building design or construction.

Supply and Return Duct Insulation

N1103.3.1 (R403.3.1)

Building framing cavities shall not be used as ducts or plenums


Location 3 inches in diameter or greater

Less than 3 inches in diameter

In attics R-8 R-6

Other locations R-6 R4.2

Exception: Ducts located completely inside the building thermal envelope including air handling units (AHU)

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Presentation Notes

No trade-offs allowed for duct insulation. Exception: - ducts completely inside the building envelope

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Service Hot Water Systems


N1103.5.1.2 (R403.5.1.2)

• 21 feet for a 3/4 inch line • 32 feet for a 5/8 inch line • 43 feet for a 1/2 inch line • 50 feet for a 3/8 inch line or less

Heated water circulation systems shall be provided when the length of hot water piping or tubing from the source of hot water to the furthest fixture exceeds:

Section N1103.5.1.2 (R403.5.1.2) Circulation system piping.

Where the water piping or tubing length contains more than one size of pipe, the largest size shall be used for determining the maximum allowable length of pipe before a circulating hot water system is required.

Demand-Controlled Hot Water Circulation

N1103.5.1.1 (R403.5.1.1)

Return line from the heated-water supply pipe to the heated-water source shall be a dedicated return pipe or a cold water supply pipe

Controls shall limit the temperature of water entering the cold-water piping to 104°F

Controls shall start the pump based on the identification of a demand for hot water within the occupancy

Controls shall automatically turn off the pump when the water in the circulation loop is at the desired temperature and when there is no demand for hot water


Mechanical Ventilation Provide outside air ventilation per Table M1507.3.3(1) Shall consist of one or more supply or exhaust fans or a

combination of such, and associated ducts and controls

N1103.5 (R403.5) and M1507


Outdoor air intakes shall have automatic or gravity dampers that close when ventilation system is not operating Notes: 1. Controls are required for supply-only

(air intake), exhaust-only and balanced systems with manual override

2. Exhaust-only systems only work when there is a fresh air inlet

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Presentation Notes

A pressure balanced ventilation system includes specific controls for both air intake and air exhaust.

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2015 IECC/IRC

N1103.5 (R403.5) and M1507

Mechanical Supplied Outside Air Ventilation

Ventilation options that meets the requirements of IRC M1507 for hot dry climates Option 1- Bathroom exhaust fan with make-up air inlet in

separate area Option 2 - Bathroom exhaust fan with make-up air inlet in

return air box Option 3 - Air Intake Duct to supply plenum

with inline fan Option 4 - Energy or Heat Recovery Ventilator

Note: These options range in cost, manufacturer & efficiencies.

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IMC Ventilation for R-2, R-3 and R-4 three stories or less and four stories or more Where the air infiltration rate in a dwelling unit is less than 5 air

changes per hour when tested with a blower door, the dwelling unit shall be ventilated by mechanical means in accordance with IMC Section 403

IMC 401.2 and 403.3

2015 IECC/IRC - IBC/IMC Major Residential Changes

Provide outside air ventilation per IMC Table 403.3.1.1

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Presentation Notes

When a smoker who lives in an apartment building cracks a window, where does the smoke go? The smoker may be hoping that the smoke will go out the window — but in many cases, cracking a window simply allows exterior air to enter the apartment. This makes it easier for the smoke to travel to adjacent apartments.

R303.3 and M1507


Bathroom Exhaust Exhaust fans in bathrooms with a shower or tub shall be

provided with a delay timer or condensation control sensor. except where functioning as a component of a whole house ventilation

system Exhaust fans shall be switched

separately from lighting systems Exhausts shall have automatic or

gravity dampers that close when the ventilation system is not operating

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Compliance Paths

Prescriptive Performance Energy Rating Index (ERI) Compliance Alternative

N1106 (R406)

CLIMATE ZONE ENERGY RATING INDEX 1 52 2 571

3 51 4 54 5 55 6 54 7 53 8 53

TABLE N1106.4 (R406.4) MAXIMUM ENERGY RATING INDEX

1Energy generated from on-site renewable energy shall not be included in the calculation of the Energy Rating Index value.

Must be provided with a vapor-retardant cover or other approved vapor-retardant means

N1103.10.4 (R403.10.4)

Exception: Where more than 70% of the energy for heating is from site-recovered energy such as heat pump or solar energy source


Outdoor heated pools and permanent spas

Laguna Pools

Swim University

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• A minimum of 90% of the permanently installed lighting fixtures shall contain only high efficacy-lamps

N1104.1

• 60 lumens per watt for lamps over 40 watts

• 50 lumens per watt for lamps over 15 to 40 watts

• 40 lumens per watt for lamps 15 watts or less

Exception: Low-voltage lighting shall not be required to utilize high-efficacy lamps.


Lighting Equipment Amendment

Cha

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Presentation Notes

High efficacy lamps: compact fluorescent lamps, T-8 or smaller diameter linear fluorescent lamps, or lamps with a minimum efficacy of: 60 lumens per watt for lamps > 40 watts 50 lumens per watt for lamps > 15 watts, but < 40 watts 40 lumens per watt for lamps < 15 watts

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2015 IRC Residential Changes

Plumbing Fixture Flow Rates

Plumbing Fixture Maximum Flow Rates

Lavatory faucet 1.5 gpm at 60 psi

Shower head a 2.0 gpm at 80 psi

Sink faucet 2.2 gpm at 60 psi

Water Closet 1.28 gallons per flushing cycle c, d

a. A handheld shower spray shall be considered a shower head. b. Consumption tolerances shall be determined from referenced standards. c. 1.6 gallons per flushing cycle is permitted where a water closet is connected to a building’s existing sanitary drainage piping. d. For a dual-flush water closet, the effective flush volume is the composite, average flush volume of two reduced flushes and one full flush.

TABLE P2903.2 MAXIMUM FLOW RATES AND CONSUMPTION FOR

PLUMBING FIXTURES AND FIXTURE FITTINGS b

P2903.2

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New Chapter/Section on Existing Buildings

Historic Additions Alterations Repairs Change of

Occupancy or use

houz

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Arizona Architecture

N1107 (R501)

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2015 IECC/IRC Residential Changes

Solar Ready Provisions Solar-ready zone area

Not less than 300 sq. ft. exclusive of access and set back areas as required by the fire code

Free from obstructions, including but not limited to vents, chimneys and roof-mounted equipment

Main electrical service panel Reserved space for a dual pole

circuit breaker for future solar electric

Appendix U

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