advanced framing walls systems and insulated headers
TRANSCRIPT
High Performance Walls:Advanced Framing Walls Systems and
Insulated Headers
Karyn Beebe, PE, LEED AP
APA –The Engineered Wood Association
Quality Services Division
Technical Services Division
Field Services Division
Market Communications Division
High Performance WallsU-factor calculation
Headers thermal path (4% of opaque wall)
Studs and plates thermal path (21% of opaque wall)
Cavity insulation thermal path (75% of opaque wall)
4%
75%
21%
2016 Title 24High Performance Walls
Proposed U-factor = 0.051Continuous InsulationStaggered Stud Wall 2x6 construction
High Performance Walls that Enhance Energy Efficiency
2016 Title 24 ProposedHigh Performance Wall SystemsDouble Walls
2016 Title 24 Proposed High Performance Wall SystemsStaggered Studs
High Performance Walls that Enhance Energy Efficiency
High Performance Walls that Enhance Energy Efficiency
2016 Title 24 Proposed High Performance Wall SystemsStructural Insulated Panels (SIPs)
High Performance Walls that Enhance Energy Efficiency
2016 Title 24 Proposed High Performance Wall SystemsStructural Insulated Panels (SIPs)
Structural Systems that Enhance Energy Efficiency
2016 Title 24 Proposed High Performance Wall Systems 2x6 Studs 2x6 Advanced Framing
Min R10.7 header
R19 batts (=R18)Min 7/16 CAT WSP
R4 (1” EPS)WRB
1-coat stucco
2016 Residential
ComplianceManual
Fig 3-43
APA Construction Guide
APA Form Number M400 Free download at
www.apawood.org
2x6 Advanced Framing
High Performance Walls that Enhance Energy Efficiency - 2x6 Advanced Framing
Phasing In 2x6 Advanced Framing
1. Switch to 2x6 studs to increase cavity insulation depth.
2. Change wall framing module from 16" o.c. to 24" o.c. (The use of double top plates avoids the need for in-line framing.)
3. Incorporate other techniques: Ladder blocking at intersecting wall Energy efficient corners (begin with 3-stud corners) Implement energy-efficient headers and High Performance attic detailing
Ladder Blocking
Ladder Junction Double top plate
3" x 6" x 0.036" galvanized steel plate
Interior wall
2x ladder blocking at 24"o.c.
Install blocking with wide face vertical for maximum backing to wall finish and for maximum insulation in exterior walls.
Energy Efficient Corners
Outside corner
Drywall clipto hold drywallin place
Two-stud Corner(with Drywall Clips) Alternatives
2012 IRC, Figure R602.3(2) FRAMING DETAILS Note: A third stud and/or partition backing stud shall be permitted to be omitted through the use of wood back-up cleats, metal drywall clips, or other approved devices that will serve as adequate backing for facing materials.
Energy Efficient Corners
Insulated Three-stud Corner (California Corner)
Outside cornerDifficult toinsulate
Traditional Corner
Energy Efficient Corners
Corner stud
2x Ladder Blocking at 24"o.c.
Outside corner
2x Ladder Blocking at 24"o.c.
2016 Residential
ComplianceManual
Fig 3-41
Energy Efficient Headers
Opening innon-load-bearing
wall
Double top plate
Cripple studs as required
Opening top plate may be doubled for openings wider than 8'
Single opening top plate
Note: Use jack studs as required.
Conventional Headers Not Required
Energy Efficient Headers
Single Ply HeadersTop plate
Cavity insulation space
3-1/8" or 3-1/2" glued laminated timbers (glulams),or multiple-ply structural composite lumber (SCL), or sawn lumber header
Jack studs as required
Outside of wall
2012 IRC Section R602.7.1
2016 Residential
ComplianceManual
Fig 3-42
Energy Efficient Headers
Prefabricated Insulated Headers
Energy Efficient Headers
One-sided Wood Structural Panel Box Header
Cavity insulation space(to full width of wall studs)
Drywall interior finished
Single stud at sides of rough openings to 48" wide,jack stud required span > 48"
Cripple studs onstud layout
Min. 15/32 PerformanceCategory wood structural panel
Header top plateto complete roughopening at header
Wood Structural Panel Box Header
Integrated Header
Air barriersAir Infiltration = Energy LossAir barrier should be continuous Joints need to be sealed (i.e. blocked panel edges)Need water resistive barrier
Structural Redundancy
May decrease the amount of required hardware: nailing, hold downs, strapping
Continuous Wood Structural Panels
Structural Redundancy
May decrease the amount of required hardware: nailing, hold downs, strapping Fewer callbacks
Continuous Wood Structural Panels
Structural Redundancy
May decrease the amount of required hardware: nailing, hold downs, strapping Fewer callbacksPerforated shear walls enhance
designer flexibility allowing narrower shear wall lengths while enhancing the wall strength and stiffness (per APA FTAO Research Report M410)
Continuous Wood Structural Panels
High Performance Attics (HPA)
ToolsRadiant Barrier SheathingEnergy Heel Trusses
Energy Heel Truss to Wall
Wood Structural Panel Overlap
Energy heel truss
Fastening per design
Optional rafter-tie or tension strap inside or over wall sheathing per manufacturer recommendation
Plywood or OSB wall sheathing
Ensure correct fastening of sheathing to top plate per shear wall, wall bracing, or combined shear and uplift requirements.*
*See rafter-tie manufacturer’s instructions for installation of strap over sheathing and into framing.
Ceiling Frame –Attic InsulationTypical Attic Insulation with “Regular Heel”
R-30 = 10"Insulatable depthat rafter heel
Minimum 1" space betweeninsulation and roof sheathing
R-38 = 12"R-49 = 15"
2009 IRC, N1102.2.1 or 2009 IECC, 402.2.1Ceilings with attic spaces. When Section N1102.1 would require R-38 in the ceiling, R-30 shall be deemed to satisfy the requirement for R-38 whenever the full height of uncompressed R-30 insulation extends over the wall top plate at the eaves. Similarly, R-38 shall be deemed to satisfy the requirement for R-49…….
Ceiling Frame –Attic InsulationTypical Attic Insulation with “Energy Heel”
R-30 = 10"
Insulatable depthat truss heel
Minimum 1" space betweeninsulation and roof sheathing
R-49 = 15"R-38 = 12"
APA System Report SR-103Use of Wood Structural Panels for Energy Heel Trusses
Energy Enhancements: 2x6 at 16” oc 2 stud corners energy efficient
intersecting walls Continuous
structural rim Ducts in
conditioned space
Case Studies
Case Studies
Case Studies
• Passive house performance• Net positive energy goal. Power generation
through PV and Wind turbine.• High efficiency plumbing fixtures
• 100% high efficacy lighting• High efficiency appliances• Air sealing and moisture barrier provided with
Liquid Membrane technology applied to the fully sheathed wood structural panel envelope
Sample of Green Features:
Case Studies
Energy Enhancements: Passive House Double wall
Advanced Framing Details 2x6 wood sheathed walls Insulated headers, corners, and intersections 24” o.c. I-Joists and thicker floor sheathing
The Inside View Project
Your Next Advanced Framing ProjectU.S.A.
Looking for Opportunities to Assist Builders with Advanced Framing and Build Case Studies
APA Web Site: apawood.org
CAD Details
Meeting Energy Codes withAdvanced Framing
Joint publication between ICC and APA Advanced Framing options
for meeting R20 or R13+5 insulation values Allows builders to use
cheaper cavity insulation to meet IECC requirements
