Residential Energy Performance Association of New Hampshire
Wall and Roof Systems
October 12, 2010
Peter Baker, P.Eng.
Building Science Corporation
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There are approximately 60 million units of
housing in the U.S. that were built prior to 1960.
Most of these will need major systems replaced in
the near future.
As siding, windows, roof claddings, mechanicals
replaced, opportunities arise to reduce the overall
energy use of these homes
CAPTURE OPPORTUNITIES !
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Source: US Census Bureau, Annual Housing Survey: http://www.census.gov/hhes/www/housing/ahs/ahs.html
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• Average House Size in 1940: ~1100 sq ft1
• Average House Size in 1973: 1660 sq ft2
• Average House Size in 2005: 2434 sq ft
1. Wilson, Alex and Jessica Boehland “Small is Beautiful” Journal of Industrial Ecology, Vol 9, No 1-2. 2005
2. EIA, Annual Energy Review, 2001 data: www.eia.doe.gov/emeu/aer
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Rain Control Layer
Vapor Control Layer
Air Control Layer
Thermal Control Layer
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HYPOTHETICAL FIBEROUS MATERIAL
Conduction
(through material)
Convection
(between fibers)
Radiation
(from one fiber
to another)
Conduction
(through air)
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HYPOTHETICAL POROUS MATERIAL
Conduction
(through material)
Convection
(within pores)
Radiation
(from one pore wall
to the other pore wall)
Conduction
(through pore gas)
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.
Cold Hot
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Brown and Bomberg 1993
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Cold Hot
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Cold Hot
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Cavity
Mineral Fiber Batts
Blown/Spray Mineral Fiber
Blown/Spray Cellulose
Cotton
Open Cell Spray Polyurethane
Closed Cell Spray Polyurethane
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Insulating Sheathing
Medium Density Mineral Fiber
Expanded Polystyrene
Extruded Polystyrene
Polyisocyanurate
Closed Cell Spray Polyurethane
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Find the thermal bridge
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Excerpt from
2006 IRC
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Excerpt from
2006 IRC
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Excerpt from
2006 IRC
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Excerpt from 2007 IRC Supplement
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Excerpt from
7th Edition Mass Code
for 1 and 2-family
dwellings
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Excerpt from
2006 IRC
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Excerpt from
2006 IRC
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