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      <marc:subfield code="a">Canada Mortgage and Housing Corporation.</marc:subfield>
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      <marc:subfield code="a">Highly energy efficient building envelope retrofits for houses </marc:subfield>
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      <marc:subfield code="a">Ottawa - Ontario : </marc:subfield>
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      <marc:subfield code="c">June 2012.</marc:subfield>
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      <marc:subfield code="a">This research provides design and construction information for retrofitting existing residential wood frame building envelopes to reduce space heating energy use by 75% or more. The research investigates high insulation building envelope retrofits; develops targets for insulation and airtightness values for foundations, walls, windows, doors and roofs; considers building code and zoning implications of changes to the building envelope; and presents details and specifications of practical retrofit strategies for common housing archetypes.</marc:subfield>
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      <marc:subfield code="t">Améliorations visant à rendre l'enveloppe des habitations très éconergétique </marc:subfield>
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