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Duct boots and other ceiling penetrations are air-sealed using spray foam

Duct boots and other ceiling penetrations are air-sealed using spray foam

Publication Date

Wed, 09/29/2021 - 12:00

2021 IECC Climate Zone 2A: Unvented Attic, 2x6 Wall, Monolithic Slab on Grade

Publication Date

Thu, 01/11/2024 - 12:00

2021 IECC Climate Zone 2B: Unvented Attic, 2x6 Wall, Monolithic Slab on Grade

Publication Date

Thu, 01/11/2024 - 12:00

2021 IECC Climate Zone 3A: Vented Attic, 2x6 Wall, Monolithic Slab on Grade

2021 IECC Climate Zone 3A: Vented Attic, 2x6 Wall, Monolithic Slab on Grade

Publication Date

Thu, 01/11/2024 - 12:00

2021 IECC Climate Zone 3B: Unvented Attic, 2x6 Wall, Monolithic Slab on Grade

Publication Date

Thu, 01/11/2024 - 12:00

2021 IECC Climate Zone 3B: Vented Attic, 2x6 Wall, Monolithic Slab on Grade

2021 IECC Climate Zone 3B: Vented Attic, 2x6 Wall, Monolithic Slab on Grade

Publication Date

Thu, 01/11/2024 - 12:00

2021 IECC Climate Zone 3C: Unvented Attic, 2x6 Wall, Monolithic Slab on Grade

Publication Date

Fri, 01/12/2024 - 12:00

2021 IECC Climate Zone 4A: Vented Cathedral Ceiling, 2x6 Wall, Slab on Grade

2021 IECC Climate Zone 4A: Vented Cathedral Ceiling, 2x6 Wall, Slab on Grade

Publication Date

Fri, 01/12/2024 - 12:00

2021 IECC Climate Zone 3C: Vented Attic, 2x6 Wall, Monolithic Slab on Grade

2021 IECC Climate Zone 3C: Vented Attic, 2x6 Wall, Monolithic Slab on Grade

Publication Date

Fri, 01/12/2024 - 12:00

Collars that are specifically made for flexible duct have a raised bead to prevent the duct from slipping off

Collars that are specifically made for flexible duct have a raised bead to prevent the duct from slipping off

Form sheet metal shield around pipe keeping 3-inch clearance

Fiberglass duct board typically comes in sheets 4 foot wide by 10 foot long

The mistake of not staggering siding and foam sheathing joints

The mistake of not staggering siding and foam sheathing joints

The retrofitted flat roof has PV panels and walking mats installed over the roofing membrane

The retrofitted flat roof has PV panels and walking mats installed over the roofing membrane

The home’s slab-on-grade foundation is wrapped in a blanket of rigid foam extending completely under the slab and along the edges.

The home’s slab-on-grade foundation is wrapped in a blanket of rigid foam extending completely under the slab and along the edges.

Mineral wool batts are precisely cut to fit around electrical boxes in the wall cavities, preventing cold spots in walls.

Mineral wool batts are precisely cut to fit around electrical boxes in the wall cavities, preventing cold spots in walls.

Wrong - Dark patterns on the Home's exterior siding show where warm air is leaking into the wall cavities.

Publication Date

Tue, 01/01/2019 - 12:00

2021 IECC Climate Zone 3A: SIP Roof, SIP Wall, Stem Wall, Slab on Grade

2021 IECC Climate Zone 3A: SIP Roof, SIP Wall, Stem Wall, Slab on Grade

Publication Date

Thu, 01/11/2024 - 12:00

2021 IECC Climate Zone 3B: SIP Roof, SIP Wall, Stem Wall, Slab on Grade

2021 IECC Climate Zone 3B: SIP Roof, SIP Wall, Stem Wall, Slab on Grade

Publication Date

Thu, 01/11/2024 - 12:00

2021 IECC Climate Zone 4A: SIP Roof, SIP Wall, Stem Wall, Slab on Grade

Publication Date

Thu, 01/11/2024 - 12:00

2021 IECC Climate Zone 3B: Vented Cathedral Ceiling, 2x6 Wall, Vented Crawl Space

2021 IECC Climate Zone 3B: Vented Cathedral Ceiling, 2x6 Wall, Vented Crawl Space

Publication Date

Fri, 01/12/2024 - 12:00

2021 IECC Climate Zone 3C: Vented Cathedral Ceiling, 2x6 Wall, Vented Crawl Space

2021 IECC Climate Zone 3C: Vented Cathedral Ceiling, 2x6 Wall, Vented Crawl Space

Publication Date

Fri, 01/12/2024 - 12:00

2021 IECC Climate Zone 4B: SIP Roof, SIP Wall, Stem Wall, Slab on Grade

2021 IECC Climate Zone 4B: SIP Roof, SIP Wall, Stem Wall, Slab on Grade

Publication Date

Sat, 01/13/2024 - 12:00

2021 IECC Climate Zone 2A: Unvented Attic, 2x6 Wall, Monolithic Slab

Publication Date

Thu, 10/19/2023 - 12:00

2021 IECC Climate Zone 3C: SIP Roof, SIP Wall, Stem Wall, Slab on Grade

2021 IECC Climate Zone 3C: SIP Roof, SIP Wall, Stem Wall, Slab on Grade

Publication Date

Fri, 01/12/2024 - 12:00

New Whole-House Solutions Case Study: Tindall Homes: The Legends at Mansfield, Columbus, NJ

Author(s)

Pacific Northwest National Laboratory

Organization(s)

PNNL

Publication Date

April, 2012

Case study describing a new construction building project of 20 luxury homes in northern New Jersey that were more energy efficient than ENERGY STAR and met the 50% energy savings requirements of the federal tax credit for new homes.

New Whole-House Solutions Case Study: Tommy Williams Homes: Longleaf Village & Belmont, Gainesville, FL

Author(s)

Pacific Northwest National Laboratory

Organization(s)

PNNL

Publication Date

April, 2012

Case study describing a production builder that achieves HERS scores of 60, compared to 85 for other builders that build new homes to Florida code.

Technology Solutions Case Study: Properly Sized and Located Return Air Inlets

Author(s)

Pacific Northwest National Laboratory

Organization(s)

PNNL

Publication Date

August, 2012

Case study describing how a properly designed duct system is essential for keeping a home comfortable, managing indoor air quality, and maximizing the performance of heating and cooling equipment.

Install wood framing cross pieces in the attic rafter bays on each side of the duct chase

Provide flashing and sealing integrated with the air and water control layers for vents and other roof penetrations

Provide flashing and sealing integrated with the air and water control layers for vents and other roof penetrations

The advance-framed 2x6 24-inch on-center walls are covered with netting then filled with R-23 blown fiberglass.

The advance-framed 2x6 24-inch on-center walls are covered with netting then filled with R-23 blown fiberglass.

Wrong – Design walls so that windows are positioned to fit regularly spaced studs so less additional studs are needed.

Wrong – Design walls so that windows are positioned to fit regularly spaced studs so less additional studs are needed.

Wiring runs are covered with canned spray foam to maintain the continuous foam layer that covers the inside and outside of these ICF block walls.

The foam-filled concrete block walls are lined on the interior side with foil-faced rigid foam then topped with furring strips for attaching drywall.

The foam-filled concrete block walls are lined on the interior side with foil-faced rigid foam then topped with furring strips for attaching drywall.

Right – R-20 of XPS and polyiso rigid foam were added on the slab shelf that is part of this precast foundation wall system.

Publication Date

Mon, 09/30/2019 - 12:00

Masonry wall interior retrofit with fluid-applied water control layer, spray foam, and wood or metal stud service cavity

Masonry wall interior retrofit with fluid-applied water control layer, spray foam, and wood or metal stud service cavity

Publication Date

Fri, 08/13/2021 - 12:00

Right – Even house wrap is installed in the factory for these modular homes where each floor is factory assembled.

Right – Even house wrap is installed in the factory for these modular homes where each floor is factory assembled.

Publication Date

Thu, 09/30/2021 - 12:00

Right – Workers pour the concrete for the basement floor slab over a vapor barrier installed over rigid foam.

Right – Workers pour the concrete for the basement floor slab over a vapor barrier installed over rigid foam.

Publication Date

Thu, 09/30/2021 - 12:00

Wrong - Dark pattern on wall is showing where warm air is leaking into the wall cavity from interior of home.

Publication Date

Tue, 01/01/2019 - 12:00

IECC Climate Zone 1A: Unvented Attic, 2x6 Wall, Monolithic Slab

IECC Climate Zone 1A: Unvented Attic, 2x6 Wall, Monolithic Slab

Publication Date

Fri, 09/29/2023 - 12:00

IECC Climate Zone 2A: Unvented Attic, 2x6 Wall, Monolithic Slab

IECC Climate Zone 2A: Unvented Attic, 2x6 Wall, Monolithic Slab

Publication Date

Wed, 10/18/2023 - 12:00

IECC Climate Zone 2A: Unvented Attic, 2x6 Wall, Pier Foundation

IECC Climate Zone 2A: Unvented Attic, 2x6 Wall, Pier Foundation

Publication Date

Wed, 10/18/2023 - 12:00

IECC Climate Zone 2B: Vented Attic, Block Wall, Slab on Grade

IECC Climate Zone 2B: Vented Attic, Block Wall, Slab on Grade

Publication Date

Wed, 10/18/2023 - 12:00

IECC Climate Zone 2B: Unvented Attic, CMU Wall, Slab on Grade

IECC Climate Zone 2B: Unvented Attic, CMU Wall, Slab on Grade

Publication Date

Wed, 10/18/2023 - 12:00

2021 IECC Climate Zone 3A: Unvented Attic, 2x6 Wall, Monolithic Slab on Grade

Publication Date

Thu, 01/11/2024 - 12:00

2021 IECC Climate Zone 4C: Vented Cathedral Ceiling, 2x6 Wall, Slab on Grade

2021 IECC Climate Zone 4C: Vented Cathedral Ceiling, 2x6 Wall, Slab on Grade

Publication Date

Mon, 01/15/2024 - 12:00

2021 IECC Climate Zone 4C: Vented Attic, ICF Wall, ICF Basement Foundation

Publication Date

Mon, 01/15/2024 - 12:00

2021 IECC Climate Zone 4C: Unvented Roof, 2x6 Wall, Vented Crawl Space

Publication Date

Mon, 01/15/2024 - 12:00

2021 IECC Climate Zone 5A: Vented Cathedral Ceiling, 2x6 Wall, Slab on Grade

2021 IECC Climate Zone 5A: Vented Cathedral Ceiling, 2x6 Wall, Slab on Grade

Publication Date

Tue, 01/16/2024 - 12:00

2021 IECC Climate Zone 5A: Vented Attic, ICF Wall, ICF Basement Foundation

Publication Date

Tue, 01/16/2024 - 12:00

2021 IECC Climate Zone 5B: Vented Cathedral Ceiling, 2x6 Wall, Slab on Grade

2021 IECC Climate Zone 5B: Vented Cathedral Ceiling, 2x6 Wall, Slab on Grade

Publication Date

Tue, 01/16/2024 - 12:00

2021 IECC Climate Zone 5A: Unvented Roof, 2x6 Wall, Vented Crawl Space

Publication Date

Tue, 01/16/2024 - 12:00

2021 IECC Climate Zone 5B: Vented Attic, ICF Wall, ICF Basement Foundation

Publication Date

Tue, 01/16/2024 - 12:00

2021 IECC Climate Zone 5B: Unvented Roof, 2x6 Wall, Vented Crawl Space

Publication Date

Tue, 01/16/2024 - 12:00

2021 IECC Climate Zone 5C: Vented Cathedral Ceiling, 2x6 Wall, Slab on Grade

2021 IECC Climate Zone 5C: Vented Cathedral Ceiling, 2x6 Wall, Slab on Grade

Publication Date

Tue, 01/16/2024 - 12:00

2021 IECC Climate Zone 5C: Vented Attic, ICF Wall, ICF Basement Foundation

Publication Date

Tue, 01/16/2024 - 12:00

2021 IECC Climate Zone 5C: Unvented Roof, 2x6 Wall, Vented Crawl Space

Publication Date

Tue, 01/16/2024 - 12:00

2021 IECC Climate Zone 6A: Vented Cathedral Ceiling, 2x6 Wall, Slab on Grade

2021 IECC Climate Zone 6A: Vented Cathedral Ceiling, 2x6 Wall, Slab on Grade

Publication Date

Wed, 01/17/2024 - 12:00

2021 IECC Climate Zone 6A: Vented Attic, ICF Wall, ICF Basement Foundation

Publication Date

Wed, 01/17/2024 - 12:00

2021 IECC Climate Zone 6A: Unvented Roof, 2x6 Wall, Vented Crawl Space

Publication Date

Wed, 01/17/2024 - 12:00

2021 IECC Climate Zone 6B: Unvented Roof, 2x6 Wall, Vented Crawl Space

Publication Date

Wed, 01/17/2024 - 12:00

2021 IECC Climate Zone 6B: Vented Cathedral Ceiling, 2x6 Wall, Slab on Grade

2021 IECC Climate Zone 6B: Vented Cathedral Ceiling, 2x6 Wall, Slab on Grade

Publication Date

Wed, 01/17/2024 - 12:00

2021 IECC Climate Zone 6B: Vented Attic, ICF Wall, ICF Basement Foundation

Publication Date

Wed, 01/17/2024 - 12:00

2021 IECC Climate Zones 7 and 8: Unvented Roof, 2x6 Wall, Vented Crawl Space

Publication Date

Wed, 01/17/2024 - 12:00

2021 IECC Climate Zones 7 and 8: Vented Attic, ICF Wall, ICF Basement Foundation

Publication Date

Wed, 01/17/2024 - 12:00

2021 IECC Climate Zones 7 and 8: Vented Cathedral Ceiling, 2x6 Wall, Slab on Grade

2021 IECC Climate Zones 7 and 8: Vented Cathedral Ceiling, 2x6 Wall, Slab on Grade

Publication Date

Wed, 01/17/2024 - 12:00

2021 IECC Climate Zone 4B: Vented Cathedral Ceiling, 2x6 Wall, Slab on Grade

2021 IECC Climate Zone 4B: Vented Cathedral Ceiling, 2x6 Wall, Slab on Grade

Publication Date

Thu, 10/19/2023 - 12:00

Right - The basement walls are wrapped with 3 inches of XPS rigid foam that will be taped at the seams then covered with a dimpled plastic water barrier.

Right - Closed-cell spray foam covers the interior of the foundation wall and wall framing is placed to the inside of the spray foam.

Right - Closed-cell spray foam covers the interior of the foundation wall and wall framing is placed to the inside of the spray foam.

Install wood framing cross pieces in the attic rafter bays on each side of the duct chase

Install wood framing cross pieces in the attic rafter bays on each side of the duct chase

Wrong: Ducts are not laid across the lower truss cords or ceiling, but are hung from the rafters by straps. As a result, ductwork is not buried

Wrong: Ducts are not laid across the lower truss cords or ceiling, but are hung from the rafters by straps. As a result, ductwork is not buried

Wrong: Ducts are held from the rafters with strapping and a large beam prevents ducts from properly lying on the ceiling plane

Wrong: Ducts are held from the rafters with strapping and a large beam prevents ducts from properly lying on the ceiling plane

Right - Foil-faced polyisocyanurate rigid foam is attached to the existing exterior wall with vertical wood furring strips

Right - Foil-faced polyisocyanurate rigid foam is attached to the existing exterior wall with vertical wood furring strips

Spray foam and rigid foam were used under the slab while rigid foam wraps the exterior of the foundation walls.

Rigid foam serves as the sheathing on these 2x6 24-inch on center walls; plywood is used only at the corners for wind bracing.

Rigid foam serves as the sheathing on these 2x6 24-inch on center walls; plywood is used only at the corners for wind bracing.

Southern Energy Homes worked with DOE researchers to develop an efficient way to dense-pack blown fiberglass into the low attics of manufactured homes.

Southern Energy Homes worked with DOE researchers to develop an efficient way to dense-pack blown fiberglass into the low attics of manufactured homes.

Seams in the ICF block are sealed so the EPS foam surface can serve as the drainage plane; no house wrap is needed.

Right – Ripped OSB provides furring strips for a ventilation gap behind the wood siding.

Publication Date

Mon, 09/30/2019 - 12:00

Step 8. Attach the new cladding to the furring strips over the rigid foam for the exterior wall retrofit.

Step 8. Attach the new cladding to the furring strips over the rigid foam for the exterior wall retrofit.

Building Science Education 3.2: Fourier's Law Part 1

Author(s)

Paul Torcellini

Organization(s)

NREL

Publication Date

July, 2021

Video that introduces Fourier's Law (the law of heat transfer), and discusses how heat flows.

Building Science Education 3.7: Calculating R-Values for a Wall Part 1

Author(s)

Paul Torcellini

Organization(s)

NREL

Publication Date

July, 2021

Video demonstrating how to calculate R-values for a simple wall construction.

Building Science Education 3.8: Calculating R-Values for a Wall Part 2

Author(s)

Paul Torcellini

Organization(s)

NREL

Publication Date

July, 2021

Video demonstrating how to calculate R-values for a simple wall construction.

IECC Climate Zone 3A: Unvented Attic, 2x6 Wall, Monolithic Slab on Grade

IECC Climate Zone 3A: Unvented Attic, 2x6 Wall, Monolithic Slab on Grade

Publication Date

Wed, 10/18/2023 - 12:00

IECC Climate Zone 2A: Unvented Attic, 2x6 Wall, Monolithic Slab on Grade

IECC Climate Zone 2A: Unvented Attic, 2x6 Wall, Monolithic Slab on Grade

Publication Date

Wed, 10/18/2023 - 12:00

IECC Climate Zone 2B: Unvented Attic, 2x6 Wall, Monolithic Slab on Grade

IECC Climate Zone 2B: Unvented Attic, 2x6 Wall, Monolithic Slab on Grade

Publication Date

Wed, 10/18/2023 - 12:00

IECC Climate Zone 3A: Vented Attic, 2x6 Wall, Monolithic Slab on Grade

IECC Climate Zone 3A: Vented Attic, 2x6 Wall, Monolithic Slab on Grade

Publication Date

Wed, 10/18/2023 - 12:00

IECC Climate Zone 3B: Unvented Attic, 2x6 Wall, Monolithic Slab on Grade

IECC Climate Zone 3B: Unvented Attic, 2x6 Wall, Monolithic Slab on Grade

Publication Date

Wed, 10/18/2023 - 12:00

IECC Climate Zone 3B: Vented Attic, 2x6 Wall, Monolithic Slab on Grade

IECC Climate Zone 3B: Vented Attic, 2x6 Wall, Monolithic Slab on Grade

Publication Date

Wed, 10/18/2023 - 12:00

2021 IECC Climate Zone 4A: Vented Cathedral Ceiling, 2x6 Wall, Vented Crawl Space

2021 IECC Climate Zone 4A: Vented Cathedral Ceiling, 2x6 Wall, Vented Crawl Space

Publication Date

Thu, 10/19/2023 - 12:00

2021 IECC Climate Zone 2A: Flat Roof, Unvented, 2x6 Wall, Monolithic Slab on Grade

2021 IECC Climate Zone 2A: Flat Roof, Unvented, 2x6 Wall, Monolithic Slab on Grade

Publication Date

Mon, 01/29/2024 - 12:00

2021 IECC Climate Zone 1A: Flat Roof, Unvented, 2x6 Wall, Monolithic Slab on Grade

2021 IECC Climate Zone 1A: Flat Roof, Unvented, 2x6 Wall, Monolithic Slab on Grade

Publication Date

Mon, 01/29/2024 - 12:00

IECC Climate Zone 1A: Unvented Attic with Spray foam at Roof Deck, 2x6 Wall-CMU Wall, Elevated Slab

Publication Date

Thu, 01/11/2024 - 12:00

2021 IECC Climate Zone 2B: Flat Roof, Unvented, 2x6 Wall, Monolithic Slab on Grade

2021 IECC Climate Zone 2B: Flat Roof, Unvented, 2x6 Wall, Monolithic Slab on Grade

Publication Date

Thu, 10/19/2023 - 12:00

2021 IECC Climate Zone 3A: Vented Cathedral Ceiling, 2x6 Wall, Vented Crawl Space

2021 IECC Climate Zone 3A: Vented Cathedral Ceiling, 2x6 Wall, Vented Crawl Space

Publication Date

Mon, 01/29/2024 - 12:00

2021 IECC Climate Zone 4B: Vented Cathedral Ceiling, 2x6 Wall, Vented Crawl Space

2021 IECC Climate Zone 4B: Vented Cathedral Ceiling, 2x6 Wall, Vented Crawl Space

Publication Date

Thu, 10/19/2023 - 12:00

Two pieces of flex duct are spliced together with a metal sleeve, nylon draw bands, mastic, metal tape, and more mastic

Seal seams in fiber board ducts with out-clinching staples, UL-181A-approved tape, and mastic

Seal seams in fiber board ducts with out-clinching staples, UL-181A-approved tape, and mastic

After attaching netting to the 2x6 studs, workers fill the wall cavities with R-23 of blown fiberglass made from recycled bottles.

After attaching netting to the 2x6 studs, workers fill the wall cavities with R-23 of blown fiberglass made from recycled bottles.

Publication Date

Tue, 12/01/2015 - 12:00

Right – Housewrap was properly shingled and taped on this wall assembly which places the housewrap beneath the rigid foam sheathing; wall cavities will be filled with spray foam.

Right – Housewrap was properly shingled and taped on this wall assembly which places the housewrap beneath the rigid foam sheathing; wall cavities will be filled with spray foam.

Publication Date

Mon, 09/30/2019 - 12:00

Right – Furring strips provide a drainage gap between the rigid foam and the siding.

Right – Furring strips provide a drainage gap between the rigid foam and the siding.

Publication Date

Mon, 09/30/2019 - 12:00