Insulating Steel Stud Back-Up & Masonry Veneer · Herbert Slone Registered Architect Technical...
Transcript of Insulating Steel Stud Back-Up & Masonry Veneer · Herbert Slone Registered Architect Technical...
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Herbert SloneRegistered Architect
Technical Manager, Commercial Insulation
Thermal Performance ofThermal Performance ofSteel Stud Framing & Steel Stud Framing &
Masonry VeneerMasonry Veneer
1.0 Hour, HSW
Updated Mar. 2008XPS03
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Copyright Materials
This presentation is protected by US and InternationalCopyright laws. Reproduction, distribution, display and use
of the presentation without written permission of OwensCorning is prohibited.
©Owens Corning 2007
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Learning Objectives
For steel stud/foam sheathing/brick veneer,
1. Understand thermal performance terms and definitions related to steel stud insulation.
2. Understand ASHRAE 90.1 requirements for continuous insulation, “ci”.
3. Understand proper technique for estimating effective R or U.
4. Understand contribution of “ci” to improved thermal performance.
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Steel Stud Back-Up for Brick Veneer
• Steel stud back-up is common in commercial construction. – Brick, aesthetics/durability – Steel, economy
• Steel stud framing offers many advantages. – Lower cost– Non-combustible– Smaller footprint– Lighter weight
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However………
Steel stud/brick veneer wall systems must be thoughtfully detailed.
Steel Stud Back-Up for Brick Veneer
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Steel stud framing is highly conductive compared to other materials, and has a dramatic effect on thermal performance of the wall assembly.
0.2 0.27 1.11
314.4
050
100150200250300350
XPS FG Batt Gypsum Steel
Conductivity: Btu x in. / hr x ft2 x oF
Thermal Performance
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Thermal Bridging
Wall Plan Section
Thermal bridges create a highly conductive parallel path through the insulation layer.
Warm Interior
Steel Stud =Thermal Bridge
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Thermal Bridging
Wall Plan Section
How is it addressed?
Warm Interior
Steel Stud =Thermal Bridge
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Continuous Insulation or “ci”
“ci”Continuous Insulation
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ASHRAE 90.1-2004, “ci” Prescribed in Commercial Steel Stud Construction
All Require Multi-Family>3 Stories Requires Not Required
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ASHRAE 90.1-2007, “ci” Prescribed in Commercial Steel Stud Construction
All Require Multi-Family>3 Stories Requires Not Required
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ASHRAE 90.1-2007, Insulation Prescribed by Climate Zone
Steel FramingZone Non-Res Res
1 13
1313+3.813+7.513+7.513+7.513+7.513+7.5
13
2 13+7.53 13+7.54 13+7.55 13+7.56 13+7.57 13+15.68 13+18.8
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Wall Plan Section
Warm Interior
Non-Insulating Sheathing over Steel Studs
Non-insulating sheathing does little to minimize heat loss because it conducts and radiates heat energy through and along the wall.
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Wall Plan Section
Warm Interior
An insulating sheathing reduces heat loss by minimizing lateral heat energy transfer along the large sheathing surfaces of the wall.
Insulating Sheathing over Steel Studs
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ASHRAE Methods Used to Estimate “Effective U”
”Series” and “Series with Correction Factor” don’t account for transverse heat flow.
• Series• Series with Correction Factor• Modified Zone Method does