High Performance Walls:

Transcription

1 High Performance Walls: Advanced Framing Walls Systems and Insulated Headers Karyn Beebe, PE, LEED AP

2 APA The Engineered Wood Association Quality Services Division Technical Services Division Field Services Division Market Communications Division

3 High Performance Walls U-factor calculation 21% 4% 75% 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 2016 Title 24 High Performance Walls Proposed U-factor = Continuous Insulation Staggered Stud Wall 2x6 construction

5 High Performance Walls that Enhance Energy Efficiency 2016 Title 24 Proposed High Performance Wall Systems Double Walls

6 2016 Title 24 Proposed High Performance Wall Systems Staggered Studs High Performance Walls that Enhance Energy Efficiency

7 High Performance Walls that Enhance Energy Efficiency 2016 Title 24 Proposed High Performance Wall Systems Structural Insulated Panels (SIPs)

8 High Performance Walls that Enhance Energy Efficiency 2016 Title 24 Proposed High Performance Wall Systems Structural Insulated Panels (SIPs)

9 Structural Systems that Enhance Energy Efficiency 2016 Title 24 Proposed High Performance Wall Systems 2x6 Studs 2x6 Advanced Framing Fig Residential Min R10.7 header R19 batts (=R18) Min 7/16 CAT WSP WRB R4 (1 EPS) 1-coat stucco Compliance Manual

10 2x6 Advanced Framing APA Construction Guide APA Form Number M400 Free download at

11 High Performance Walls that Enhance Energy Efficiency - 2x6 Advanced Framing

12 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 inline 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

13 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.

14 Energy Efficient Corners Two-stud Corner (with Drywall Clips) Drywall clip to hold drywall in place Outside corner 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.

15 Energy Efficient Corners Insulated Three-stud Corner (California Corner) Traditional Corner Outside corner Difficult to insulate

16 Energy Efficient Corners 2016 Residential Corner stud 2x Ladder Blocking at 24"o.c. Compliance Manual Fig 3-41 Outside corner 2x Ladder Blocking at 24"o.c.

17 Energy Efficient Headers Conventional Headers Not Required Double top plate Cripple studs as required Opening in non-loadbearing wall Opening top plate may be doubled for openings wider than 8' Single opening top plate Note: Use jack studs as required.

18 Energy Efficient Headers 2016 Residential Single Ply Headers Outside of wall Top plate Cavity insulation space Compliance Manual Fig /8" or 3-1/2" glued laminated timbers (glulams), or multiple-ply structural composite lumber (SCL), or sawn lumber header Jack studs as required 2012 IRC Section R

19 Energy Efficient Headers Prefabricated Insulated Headers

20 Energy Efficient Headers One-sided Wood Structural Panel Box Header Cripple studs on stud layout Min. 15/32 Performance Category wood structural panel Header top plate to complete rough opening at 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"

21 Wood Structural Panel Box Header

22 Integrated Header

23 Air barriers Air Infiltration = Energy Loss Air barrier should be continuous Joints need to be sealed (i.e. blocked panel edges) Need water resistive barrier

24 Structural Redundancy Continuous Wood Structural Panels May decrease the amount of required hardware: nailing, hold downs, strapping

25 Structural Redundancy Continuous Wood Structural Panels May decrease the amount of required hardware: nailing, hold downs, strapping Fewer callbacks

26 Structural Redundancy Continuous Wood Structural Panels May decrease the amount of required hardware: nailing, hold downs, strapping Fewer callbacks Perforated shear walls enhance designer flexibility allowing narrower shear wall lengths while enhancing the wall strength and stiffness (per APA FTAO Research Report M410)

27 High Performance Attics (HPA) Tools Radiant Barrier Sheathing Energy Heel Trusses

28 Energy Heel Truss to Wall Wood Structural Panel Overlap Energy heel truss Fastening per design Ensure correct fastening of sheathing to top plate per shear wall, wall bracing, or combined shear and uplift requirements.* Optional rafter-tie or tension strap inside or over wall sheathing per manufacturer recommendation Plywood or OSB wall sheathing *See rafter-tie manufacturer s instructions for installation of strap over sheathing and into framing.

29 Ceiling Frame Attic Insulation Typical Attic Insulation with Regular Heel Minimum 1" space between insulation and roof sheathing Insulatable depth at rafter heel R-49 = 15" R-38 = 12" R-30 = 10"

30 Ceiling Frame Attic Insulation Typical Attic Insulation with Energy Heel Minimum 1" space between insulation and roof sheathing Insulatable depth at truss heel R-49 = 15" R-38 = 12" R-30 = 10" 2009 IRC, N or 2009 IECC, Ceilings with attic spaces. When Section N 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.

31 APA System Report SR-103 Use of Wood Structural Panels for Energy Heel Trusses

32 Case Studies Energy Enhancements: 2x6 at 16 oc 2 stud corners energy efficient intersecting walls Continuous structural rim Ducts in conditioned space

33 Case Studies

34 Case Studies Sample of Green Features: 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

35 Case Studies Energy Enhancements: Passive House Double wall

36 The Inside View Project Advanced Framing Details 2x6 wood sheathed walls Insulated headers, corners, and intersections 24 o.c. I-Joists and thicker floor sheathing

37 Your Next Advanced Framing Project U.S.A. Looking for Opportunities to Assist Builders with Advanced Framing and Build Case Studies

38 APA Web Site: apawood.org

39 CAD Details

40 Meeting Energy Codes with Advanced 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

41 Questions? Karyn Beebe, PE, LEED AP (858)