2015 IECC Air Sealing Multifamily For Code Compliance 2 Funding - - PDF document

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2015 iecc air sealing multifamily for code compliance
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2015 IECC Air Sealing Multifamily For Code Compliance 2 Funding - - PDF document

Dec 11, 2023 102 likes •338 views

11/7/2018 2015 IECC Air Sealing Multifamily For Code Compliance 2 Funding for Energy Code Training 1 11/7/2018 Sponsor Also Recognize Resources Provided by Department of Energy: DOE Building America Program https://www.energycodes.gov/

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2015 IECC Air Sealing Multifamily For Code Compliance

Funding for Energy Code Training

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Also Recognize Resources Provided by Department of Energy: DOE Building America Program https://www.energycodes.gov/ DOE Building Energy Codes Program https://basc.gov/ & RobbySchwarz ‐ EnergyLogic

Sponsor

IECC Residential Buildings:

(Different from IBC definition)

One- and two-family dwellings, townhouses of

any size and R-2, R-3, R-4 ≤ 3 stories – (all R’s except for hotels/motels)

All buildings that are not “residential” by definition

are “commercial”

 R-1

Hotel/Motel

 R-2 Sleeping > than 2 units- Apartments  R-3 Dwelling – not more than 2 units  R-4 24 hour custodial care

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Focus Townhouse Projects – applies to all Multi-Family

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Infiltration

  • Uncontrolled

leakage of outside air into the

  • ccupied space

through openings in the building envelope.

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Building Thermal Envelope - Section R402.4.1 –Air Leakage

Two options to demonstrate compliance

Whole-house pressure test

  • By State Amendment, all climate zones test to 5 ACH @

50 pa

  • January 1, 2019- 3.5 ACH @ 50 pa
  • January 1, 2021- 3.0 ACH @ 50 pa
  • Testing may be by any certified testing- including

contractors and sub contractors

  • Testing may occur any time after creation of all building

envelope penetrations OR Field verification of items listed in Table

R402.4.1.1

Homes testing 3 ACH @ 50 pa require

mechanical ventilation- IRC 303.4

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Table R402.4.1.1 - new format – separate columns

Component Air Barrier Criteria Insulation Installation Criteria

General requirements A continuous air barrier shall be installed in the building envelope. The exterior thermal envelope contains a continuous air barrier. Breaks or joints in the air barrier shall be sealed. Air-permeable insulation shall not be used as a sealing material. Ceiling/attic The air barrier in any dropped ceiling/soffit shall be aligned with the insulation and any gaps in the air barrier sealed. Access openings, drop down stair or knee wall doors to unconditioned attic spaces shall be sealed. The insulation in any dropped ceiling/soffit shall be aligned with the air barrier. Walls The junction of the foundation and sill plate shall be sealed. The junction of the top plate and the top of exterior walls shall be sealed. Knee walls shall be sealed.

Cavities within corners and headers of frame walls shall be insulated by completely filling the cavity with a material having a thermal resistance of R-3 per inch minimum. Exterior thermal envelope insulation for framed walls shall be installed in substantial contact and continuous alignment with the air barrier.

Windows, skylights and doors The space between window/door jambs and framing and skylights and framing shall be sealed.

(partial table)

NEW

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  • Appliances and combustion air openings

to be located outside the building thermal envelope or enclosed in a room isolated from inside the thermal envelope in Climate Zones 3-8- ALL of Utah

  • Where open combustion air ducts

provide combustion air to open combustion fuel-burning appliances

  • Furnaces, boilers, water heaters
  • Rooms to be sealed and insulated per

envelope requirements

  • Doors into the rooms fully gasketed
  • Water lines and ducts insulated
  • Combustion air ducts that pass through

conditioned space, insulated to > R-8

  • Does not apply if combustion air is drawn

from inside the home

Rooms Containing Fuel-burning Appliances - OPEN COMBUSTION AIR

Both Residential and Commercial Buildings-IECC Requirement

NEW

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Exceptions:

  • Direct Vent
  • Fireplaces
  • Stoves

Two Important Decisions Impacting Air Tightness

Locate Furnace/Air-Handler Inside Envelope

  • Reduce duct penetrations through

the thermal/air barrier envelope

  • Furnace closets off garages are

difficult to seal Duct inside the Envelope

  • Duct leakage will not contribute to

envelope leakage

  • Supply boots and return boxes

don’t penetrate the air barrier

  • Other benefits include elimination of

duct heat loss and gain, no duct testing requirement

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Direct Furnace Installed Direct Vent

  • Two pipe venting
  • Upper compartment sealed

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Building Cavities Section R403.3.5 - Mandatory Framing cavities cannot be used as ducts or plenums State amendment allows panning Difficult to pass a duct test if panned May Leak to Outside Envelope

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Section R403.6 - Mechanical Ventilation Required (IRC) if blower door tested tighter than 3 ACH@50pa (State amended from 5 ACH@50pa) Ventilation

  • Building to have ventilation meeting IRC or IMC or with other

approved means (previously deleted by the 2012 amendments)

  • Outdoor air intakes and exhausts shall have automatic or gravity

dampers that close when the ventilation system is not operating Whole-house mechanical ventilation system fans to meet

efficacy in Table R403.6.1

 Exception

 When fans are integral to tested and listed HVAC equipment, they shall be powered by an

electronically commutated motor

NEW

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Blower door testing is an optional air sealing compliance method by amendment

Two Challenging Design Details

Garage – Partially Under Living Space Offset Walls

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Energy Code Guide

  • All termination have dampers?
  • Do the dampers meet air

leakage standards

  • Consider better gravity

dampers

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The Challenge

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Fire/Party Walls Lack Air Barriers, Coverings

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Insure Typical Issues in all Dwellings Addressed

  • Fireplaces
  • Tubs
  • Showers
  • Cantilevers
  • Penetrations
  • Sills
  • Dampers

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Two Approaches to Air Sealing Multi-Family

Framing/Sheathing

Drywall/Framing

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Airtight Drywall Approach – Interior Air Barrier Using Drywall and Framing Provide a continuous and complete air barrier System

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Sealing Perimeter of Drywall Assemblies

  • all exterior wall bottom and top

plates

  • all top plates at insulated

ceilings

  • rough opening perimeters
  • and both sides of the first

interior stud of partition walls

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Electric Box Penetrations

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Air Sealing at Partition

  • Adhesive at bottom and

top of partition stud allows air barrier to transition uninterrupted to

  • ther side of partition
  • Penetrations through first

partition stud must also be sealed

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Airtight Drywall

  • Drywall sealed to top and

bottom plates

  • Bottom plate sealed to

subfloor

  • Subfloor sealed to rim

closure board

  • Rim closure board sealed to

top plate

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Top Plate with Unconditioned Space Above

  • Penetrations through top plate

must be sealed

  • Electrical and communication

Wires

  • Plumbing
  • Exhaust ducts
  • Refrigerant lines

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Recessed Fixture in Insulated Ceiling

  • Fixture labeled IC-rated and airtight as determined by ASTM E-283 air leakage

test

  • Housing (not decorative trim piece) sealed to ceiling with caulk or gasket

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Air Barrier Continuity at Rim Joist/Band Joist

  • Continuous fillet bead applied at

bottom of rim closure board

  • Continuous bead of adhesive

applied to top of rim closure board

  • Sealant applied at all butt joints

in rim closure board and sill plate/top plate

  • Spray foam may also be used

to seal between the sill/top plate, rim/band joist, and floor deck.

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Framing – Sheathing Air Sealing

Discussion based on Shaft Liner Similar practices apply with -2-

  • ne hour walls

Fire wall design focused on:

  • Fire & Smoke, with an IBC

requirement also for sound If air leaks, odors leak

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Compartmentalize Party Walls

  • ‘Picture Frame’ each level
  • Block/Seal at floor/foundation
  • Each floor system
  • Ceiling / Attic
  • Exterior front and rear spaces

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Architectural Detail – Ceiling / Attic

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Top Floor – Ceiling to Attic

  • Shaft liner continues up

parapet- or fire rated sheathing

  • Framing change- wall to gable

truss

  • Critical to create an air seal at

the ceiling plane

  • Packed fiberglass or mineral

wool is NOT an air seal

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Solid Fiber Blocking

  • Fills majority of space
  • Requires additional sealing
  • Space may not allow 1” shaft

liner, other solid material OK

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Alternate Method

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Identical Issue at End of Wall – Exterior Wall

  • Block and seal

vertically

  • and/or seal on the

exterior

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Insure Foam used for Fire Blocking is Approved

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Stairs From Garage Under Living Space

  • Block and seal
  • Also walls between first level

garage and first level living space

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Between Floors

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Concrete Floor or Foundation

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Rim at Foundation

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Rim Between Dwellings

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Crawlspace Wall Between Dwellings

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Questions?

  • Ventilation- when should it happen?
  • Duct Systems and Locations
  • Your Experiences
  • Suggestions
  • Comments

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Thank You!

  • Questions/comments may be addressed to me at:
  • Brent Ursenbach
  • bursenbach@gmail.com
  • brentu@WC-3.com
  • C: 801-381-1449

If you would like a copy of this or other presentations, please go to www.utahenergycode.com

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