Category Archives: Energy Conservation

2015 Washington State Residential Energy Code – Insulation mark

The 2015 Washington State Energy Code (WSEC)  requires R value identification on all batt insulation over 12” in width.  There are several code sections that reference R value identification.  The first is R303.1.  which requires all equipment, materials and systems … Continue reading

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2015 Washington State Residential Energy Code – Slab insulation

  The 2015 Washington State Energy Code (R402.2.9) requires insulation at the perimeter of both heated and unheated slab on grade floors. The example shows an instance where the insulation has been installed horizontally, but the code also allows for … Continue reading

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Residential Code requirement for access door insulation

  The 2012 International Residential Code (N1102.2.4) requires insulation at all hatches and doors that separate conditioned and non-conditioned spaces. These locations are typically found at openings to the crawl space and attic. The insulation R-value must be equivalent to … Continue reading

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Residential Code requirement for air barrier at tub / shower

The 2012 International Residential Code (N1102.4.1.1) requires certain elements in the building thermal envelope to be installed according to the manufacturer’s instructions and Table N1102.4.1.1. There are a total of sixteen specific building components listed in Table N1102.4.1, each with … Continue reading

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Residential Code requirement for insulation baffle

The Residential Building Code (R806.1) requires ventilation of enclosed attic and rafter spaces.  Energy requirements also mandate the use of attic insulation, which if installed improperly may either block or limit air circulation.  The code directly address this situation (R806.3) … Continue reading

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Residential Code requirement for recessed lights

The Residential Building Code (N1102.4.4) requires the use gaskets or caulks when recessed lighting is installed between conditioned and unconditioned space.  The recessed lighting must be IC-rated and labeled indicating an air leakage rate of not more than 2.0 CFM … Continue reading

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Residential Code requirement for duct sealing

Information regarding the mandatory sealing of ducts can be found in several sections of the Residential Building Code.  Section N1103.2.2 located in the energy chapter requires the mandatory sealing of ducts, and then refers to methods found in the section … Continue reading

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Residential Code requirement for insulation certificate

The building thermal envelope of each home may be comprised of various types of insulation materials and R values.  The energy section of the Residential Code (N1101.12.1) requires the placing of a certificate which details important information about the insulation. … Continue reading

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Residential Code requirement for attic insulation markers

The energy portion of the residential code (N1101.12.1.1) requires the installation of depth markers when blown or sprayed-in insulation is used in the attic.  The markers are necessary to determine the initial R value of the insulation during installation, as … Continue reading

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Residential Code requirement for energy certificate

The 2012 International Residential Code (IRC) now includes a whole new energy chapter.  This is a significant change from 2009 IRC which previously lacked an energy code section.  The 2012 IRC now contains a substantial amount of new code language … Continue reading

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