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STEVEN BACZEK
What is Thermal Bridging?• A reduction of the effectiveness of insulation to reduce conductive heat
flow through the building envelope otherwise know as “heat loss”
• Concrete, steel reduce the thermal effectiveness of insulation by up to 50%
• Wood reduces the thermal effectiveness of insulation by 15 to 20%
• Windows may reduce the effectiveness by 30%
• Heat loss means inefficient energy use
• How do we fix this problem?
- Reduced Thermal Bridging
STEVEN BACZEK
How do we reduce Thermal Bridging?
• Better application of thermal insulation– More insulation– Installed properly – Grade 1– Reduce the areas where it can be bridged
• How?– Advanced Framing or OVE
STEVEN BACZEK
OPTIMUM VALUE ENGINEERINGOPTIMUM VALUE ENGINEERING
TYPICALLY CALLED “OVE”
“OVE” IS A SERIES OF CHOICES,NOT A METHOD OF WOODFRAME CONSTRUCTION
ADVANCED FRAMING USES THE“OVE” CONCEPT
STEVEN BACZEK
WHAT IS THE OVE CONCEPT?WHAT IS THE OVE CONCEPT?
• OPTIMUM Best or most favorable condition / best result
• VALUE Relative worth, merit, or usefulness / equivalent return
• ENGINEERING Art and science of practical application
STEVEN BACZEK
WHY USE OVE?WHY USE OVE?
• Improve current project quality• Eliminate unnecessary costs• Reduce initial cost• Reduce life cycle costs• Solve existing problems
STEVEN BACZEK
OVE EXAMPLES YOU ARE USINGOVE EXAMPLES YOU ARE USING
• 2x4 vs 2x6 Framing• 16” vs 19.2” vs 24” Framing centers• Trusses vs Stick framed roof• Solid sawn floor vs Engineered floor system• OSB vs Plywood vs Insulating Sheathing
STEVEN BACZEK
WHAT IS ADVANCED FRAMING?WHAT IS ADVANCED FRAMING?
• The Optimum use of wood framing
• Provides the most Value per unit cost
• The most practical Engineered application of a wood frame
STEVEN BACZEK
Stretch Code RequirementsNew Thermal Enclosure Checklist (THE) will be a requirement for Stretch Code in 2011- From Energy
Star 3, which includes new section 4 belowhttp://www.energystar.gov/ia/partners/bldrs_lenders_raters/downloads/InspectionChecklists.pdf
4. Reduced Thermal Bridging:
• 4.1 Raised-heel truss or equivalent framing / insulation method used in the attic 8
• 4.2 HVAC and other attic platforms installed to allow for full-depth insulation below
• 4.3 Reduced thermal bridging at walls using one of the following options:
– 4.3.1 Continuous rigid insulation sheathing, insulated siding, or combination of the two;
– > R-3 in Climate Zones 1-4, > R-5 in Climate Zones 5-8 9,10, OR;
– 4.3.2 Structural Insulated Panels (SIPs), OR;
– 4.3.3 Insulated Concrete Forms (ICFs), OR;
– 4.3.4 Double-wall framing11, OR
– 4.3.5 Advanced framing, including all of the items below: • 4.3.5a All corners insulated > R-6 to edge12, AND;
• 4.3.5b All headers above windows & doors insulated13, AND;
• 4.3.5c Framing limited at all windows & doors14, AND;
• 4.3.5d All interior / exterior wall intersections insulated15, AND;
• 4.3.5e Minimum stud spacing of 16" for 2 x 4 framing and 24" for 2 x 6 framing unless construction documents specify other spacing is structurally required16
STEVEN BACZEK
Cost Implications of Advanced Framing
• Architecture
• Studs, Plates, Headers
• Sheathing
• Mechanical Fasteners
• Training
• Frame Labor
• Drywall labor
• Insulation
NET RESULT
• Not more if done at start
• Significant savings – 25%
• More - 5/8” vs. 1/2”
• More –Plates, clips, hangers
• More – retrain framing crew
• Should be less
• A little more
• A little more, but this is the end goal
• Eventually 10-20% savings
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