hew 805 detailing continuity in building enclosure …...conditions can be challenging. this...

Huber Engineered Woods |

Detailing Continuity in Building Enclosure Systems

HEW 805

Presented by:

Huber Engineered Woods

Disclaimer: This presentation was developed by a third party and is not funded by

WoodWorks or the Softwood Lumber Board.


COPYRIGHT MATERIALS

This presentation is protected by U.S. and International copyright laws. Reproduction, distribution, display and use of the presentation without written permission of the speaker is prohibited.

© 2017 HUBER ENGINEERED WOODS, LLC.


“The Wood Products Council” is a Registered Provider with The American Institute of Architects Continuing Education Systems (AIA/CES), Provider #G516.

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.


The role of the building enclosure is to provide proper separation between the interior and exterior of a building. Beyond the structural enclosure, separation is accomplished through the use of four primary types of barriers: water-resistant barriers, air barriers, thermal barriers, and vapor retarders. While this can seem fairly straightforward along flat, continuous surfaces, non-continuous conditions can be challenging. This presentation explores the importance of detailing continuity in maintaining the integrity of the four control layers of the building enclosure. Discussion will focus on methods for identifying areas where continuity can be disrupted, and solutions for maintaining control layer continuity in these areas.

Course Description


1. Explain the four primary, code based control layers that make up a building enclosure system.

2. Define the primary issues related to continuity of building enclosure control layers in wood-frame wall and roof assemblies.

3. Review the common choices for products and materials for building enclosure control layers, including critical transitional areas.

4. Compare different drawing details and solutions for their use in wood-frame wall and roof assemblies.

Learning Objectives


Course Outline

Part 1• The Four

Control Layers

Part 2• Continuity of Control Layers

Part 4• Detailing Solutions

Part 5• Conclusion

Part 3• Choices in

Systems


Introduction

•Building Enclosures– Provide proper

separation between the building interior and the exterior to control:

– Water penetration– Air flow– Vapor transfer– Thermal transmission


Section I: The Four Control Layers


Weather Resistant Control Layer2015 International Building Code (IBC) and

International Residential Code (IRC) require:• Weather Protection– Exterior walls shall provide the building with a

weather-resistant exterior wall envelope.• Flashing– Shall be installed at the perimeters of exterior

door and window assemblies, penetrations and terminations of exterior wall assemblies, exterior wall intersections with roofs, chimneys, porches, decks, balconies, and similar projections … and similar locations where moisture could enter the wall.


Air Control LayerAir Barrier Material Testing• ASTM E2178 Air Permeance of Building Materials

• 1.0 m x 1.0 m specimen with no seams or transitions

•Must achieve less than 0.02 L/(s*m2) @ 75 Pa


Air Control LayerAir Barrier Assembly

Testing• ASTM E2357 Air Leakage

of Air Barrier Assemblies

• 8.0 ft x 8.0 ft wall with penetrations/transitions

• Includes wind cycling• Measures infiltration and

exfiltration• Must achieve less than

0.2 L/(s*m2) @ 75 Pa


Vapor Control Layer

• International Building Code and International Residential Code require vapor retarders for protection of construction assembly.


Thermal Control Layer

• IECC requires opaque building enclosures to be insulated based on climate zone.• Insulation between studs not enough due to thermal bridging.• Continuous insulation (ci) required to minimize thermal bridging


Thermal Control LayerTypical Cavity Insulation Assembly

R-13 Cavity Insulation

Exterior Sheathing

Interior Gypsum Board

2x4 Framing


Thermal Control LayerCavity Insulation Plus Continuous Insulation

R-13 Cavity Insulation

R-5 Continuous Insulation

Exterior Sheathing

Interior Gypsum Board

2x4 Framing

The amount of ci to use will be based on energy performance goals. Application can be separate product or integrated with sheathing


Section II: Continuity of Control Layers


Continuity of Control Layers

• Assuring Integrity– Look at complete building– Understand compromising

one barrier may compromise others

– Control layers can be single function/multiple product solutions,

OR– Multi-function/single

product solution


Continuity of Control Layers

Discontinuous conditions create performance risk!

– Transition from one material to another

– Change in plane

– Penetrations/interruptionsin the control layer


Identifying the Building Envelope

• Start at one corner of the building • Draw a continuous line around the building enclosure.• Circle the changes in plane or potential discontinuity


Construction Detailing

• Writing “continuous” on a design detail or specification is not quite enough

• Buildings need to be designed and detailed to create continuity

• Details are critical


Section III: Choices in Control Layer Systems:

Impact on Continuity


Choices in Control Layer Systems

Multiple products / Multiple layers

• Each of four control layers may be specified and installed separately

• Each needs to be compatible with each other and the building structure

• Each are tested separately

• Each needs to be assured to be continuous across all conditions

• Each needs to be durable



Single Product, Multi-function• Structural sheathing panels with integrated:– Weather-Resistive Barrier (WRB)– Air Barrier– Vapor permeability– Optional continuous insulation barrier• Membrane fused to the structural panel during manufacturing• Installation can be simpler and quicker• Reduced labor time and skill required


Assuring Continuity of Assembly• Seams of integrated panels are sealed with self-adhering tape• Openings and penetrations can be addressed with sealants or liquid flashing• Flexibility of tapes and sealants allows for full conformity and continuity of control layers.• Accommodates structural gaps while assuring control layers are intact.



Choices in Control Layer SystemsAssuring Continuity of Assembly

Windows and door openings require special attention for continuity of control layers.

Fluid-applied flashing material Flexible flashing tape


Section IV: Detailing Solutions


Detailing Solutions

Sample Details

• Based on integrated product solution• Focus on continuity of control layers


Foundation to Framed Wall

Conventional flashing and sealing tape:

May not achieve air/vapor seal beneath metal

Liquid flashing across sill joint

Sealing tape across seal:Not durable


Control Layer Compatibility: Foundation to Framed Wall

Compatability Structure WRB Air Barrier VaporPermeable

Thermal Barrier

Metal Flashing X ü* X X XAcrylic Flashing

Tape X ü ü X X

Liquid Flashing X ü ü ü XIntegrated

Multi-Function Panel

ü ü ü ü ü

*Only when integrated with the WRB using approved self adhered flashing


Framed Wall to Concrete/CMU Wall

Plan view Perspective view into corner

Critical detail:Wood not in touch with

masonry.


Control Layer Compatibility: Framed Wall to Concrete/CMU


Thermal Barrier

Metal Flashing X ü* X X X

Acrylic Flashing Tape X ü* ü* X X

Liquid Flashing X ü ü ü X

IntegratedMulti-Function

Panelü ü ü ü ü

*Only when integrated with the WRB using approved liquid flashing against CMU/Concrete


Wall to Roof Detail

Critical detail:Flash each system independently- wall to roof, then flashing to wall.

Sealing tape over and under metal flashing


Control Layer Compatibility: Wall to Roof


Thermal Barrier


Tape X ü ü X X


Integrated Multi-Function Panel ü ü ü ü ü



Window Opening DetailTypical Flashing


Window Opening Detail – Flanged

Pan First-Stretchable tape or fluid applied

Sealing Tape Last-jambs first then head, shingle apply

Window Next-seal back flange 3 sides only

Critical details…


Window Opening Detail –Store Front

1. Pan First-stretchable tape works best

3. Head Jamb Last- shingle apply

2. Side Jambs Next-Protect exposed wood.


Window Opening Detail - Recessed

Protect exposedframing

Sill Pan at Window

Fluid applied works best due

to framing irregularity


Window Opening Detail- Picture Framed

Sequencing is critical with picture framed windows.

This is the one of the most difficult windows to install and still maintain continuity with the building control layers.

Let's watch and see how this detail is constructed.

1. First step is to install the wood frame around the opening, typically 1 x material.



2. Create continuity between frame and WRB-seal between frame and WRB surface.



3. Tape/flash bottom edge of picture frame to WRB surface.

Acrylic tapes are pressure activated. If using acrylic tape, be sure to roll tape at every step in process to ensure proper adhesion.



4. Create sill pan with stretchable pan flashing material.



5. Prepare opening for window installation – seal back of window flange at side and window head locations per window manufacturer’s instructions.



6. Install window in opening.



7. Flash window flange to picture frame, and picture frame to WRB with continuous flashing tape.



8. Flash top of frame to outside edges of sides.



9. Complete continuity by installing stretchable flashing tape at corners of the picture frame.

10. Alternate installation: Install stretchable flashing tape at bottom corners of picture frame after installing window in opening (Step 6)


Window Opening DetailInterior sealing for continuity

Back of flange sealant, 3 sides only


Door Rough Opening Interior

Critical details:• Install flashing tape even with

interior edge of jamb minimum.• Stretchable flashing works best at

header• Shingle apply: jambs then header• Seal bottom of door under threshold

at installation• Air seal inside edge of jamb after

installation


Door in Opening, Exterior

Leak path- critical detail:flash drip edge to WRB surface


Control Layer Compatibility: Windows and Doors


Thermal Barrier

Metal Flashing NA NA NA NA NAAcrylic Flashing

Tape X ü ü X X




Masonry Veneer Detail

2 Continuity Concerns


Control Layer Compatibility: Masonry Veneer


Thermal Barrier


Tape X ü ü X X





Parapet Walls

Most overlooked detail: providing back of parapet with same WRB,

air, moisture performance as front of parapet.

Critical detail: provide water, air, vapor seal between top and sides of parapet BEFORE finished cap

material.

Roofing membrane


Control Layer Compatibility: Parapet Wall


Thermal Barrier


Tape X ü ü X X





Deck and Balcony Detail

Critical detail: if a panel seam occurs behind the ledger board, the seam

must be sealed.

Metal flashers diverts water away from

building


Control Layer Compatibility: Deck and Balcony Ledger


Thermal Barrier


Tape X ü ü X X





Penetrations

Critical Details:Specify fluid applied or stretchable tape solution for round penetrations.

Specify fluid applied or acrylic tapesolution for square/rectangularpenetrations, shingle applied.


Penetrations

Stretchable tape solution:Overlap tape below penetration(Bow tie effect)

Fluid applied solution


Section V: Conclusions


Conclusions

The Key to Continuity is Detailing• All building conditions where there is a change of any type need to be addressed.

• All control layers must be detailed and constructed to be continuous.


ConclusionsIntegrated products

simplify continuity

• Continuity is about protecting the integrity of the building envelope• The simpler the system, the easier to achieve• Integrated, multi-functional sheathing products can provide all water-resistive, air, and thermal control layers in one application• Coordinated tape, sealant, and liquid flashing assure a complete assembly solution.


ConclusionsIntegrated products

mitigate risk

• Single source for field support• Single manufacturer warranty


• This concludes The American Institute of Architects Continuing Education Systems Course

Thank you for participating.

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hew 805 detailing continuity in building enclosure …...conditions can be challenging. this...

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