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• • TABLE 401.1(1) PRESCRIPTIVE ENVELOPE REQUIREMENTS' STANDARD BASE CASE LOG HOMES ONLY BUILDING COMPONENT '. RpubM Performance EquivWmValud Required Performance - Equivalent va4uea Wall insulation—above grade U-0.060 R213 Noted Noted Wall insulation—below grade' P-0.565 R 15 F-0.565 R-I5 Flat Ceilings, U-0031 R-38 U-0.025 R-49 Vaulted ceilings= -_.- -.-.._ U-0.042 ---- R383 .-. . 12-0.027 R-38A3 -_--_. Underfloots . .. 11-0.028.-- R 30 U-0.028--_ -..R-30 --...- Slab edge perimeter P-0520 R 15 F42.520 ---- R-15 ---- Heated slab mmrior iUa R 10 Na R-10 Windows ---_ ).-035 U-075 C-0.35 11-0.35 Window area limitation' IVa nta Na nig Skylights U-060 C-06U LO60 U-060 Exteriordoora^ L-020.-... C-020 r-.- C-0S4 Exterior doors wt>2.5 ft'glazing ' U-0.4O C-0 40 U-0.40 U-0.40 corced air duct insulation n!a R 8 m'a R 8 %prr SI: I square foot=03N29mr. a. Asallowd in Section404.1,Menial performance ofacomtnnem may he adjustelprmukdthatoverail heat loss does not meadthe m eresulting nomamfor- oanaeto the required ti-value standards.Caleaadhemans to documentequivalem h lass shall be perfonned using the procedure adappnnd TFnalues contained Table 4041(1 3- R-value used in Ns able arc nominal.ref the mailmion only to standard vamd framed rotvuuclion and not for the entire assembly c. Well insulation requirements apply to all exterior wood framed,concrete or masonry walls that are abovegrade.This include minute walls and rim joist arras. R-19 Advanced Frame or 2 x 4 all with rigid insulation may be substituted if weal nominal insulation R-value Is 18.5 or greater. d.The wall .mrp,ITLnt shall be a minimum solid log or timber wall thickness of3.5 inches(90 mm). c. Below-grate woods concrete or masonry walls include all wails that arc hekw grade and tines not include those portions of such wall that wend mom than 24 inches above grade. f Insolation levels for ceilings that have limited atSUrafYrdepthauch as dormers,hay windows or similaramhhamml features totaling not more than ISOsgaare feet(139m°)in aura may be rcduccd to not lessthan R-21.When reduced,the cavity shall lot filled(except for tenoned wmilation spats). g.The maximum vaultd ceilingsurface area-shall mac geaerthun50pereentdtiti al heated spaccflooraee wl6saeea has a OtraMnugreaterthan 12-0.031. The L.-factor of0.042isrcprarnativeofa vaulted scissor truss.A 10-inch(_.54 mm)depreltcrvaultcd ceiling with R-30 insulationisll-0.033 andeomplIm with the requirement.not to caece410 pacat of the twat heated space floor ma h.A=advanced frame consaucdon.which shall Amebic full required in.sukdng value to the outside of=tenor walls. i. Hemedsiah interior applimtoconcietz.slab floors(both on and hclnw grade)that incor)xmtearaliant heating system within theslab.Insulation shall be installed undemath the enure slab j. Sliding glass doors shall comply with widow perfoi arc requirements.Windows exempt form testing In accordance with Section 4112,Item 3 shall coma with window performance requirements if constructed with thermal break aluminum or wood,a vinyl,Pr fiberglass frames and double-pine glavng with law-emissivity coatings of 0.10 Cr kis. k.Reduced window area may not be used as a tndwffaitmian fa thermal performance of any component. L SkyEgln erainstalld at 2pcwent or leas of total heatdspace Boor arta shall be deemed to satisfy this requirement withvinyl,wwd,orthermellybmkenalumi- numfrmoesaddouble-pancglazingwi bkwavauvity cwrings.SkyliglttV-fammistcstd in the 20dcgree(035 rad)overhcadplaneper\tNC standanS m.A maximumof 28 square feet(2.6 art)ofexterior door area per dwelling unit can have a U-factor of 0.54 or Ism. n.Glazing that Waiter dwble gene with low-c.coning on nr surface.or triple pane shall be deemed to comply with this C-0.40 requirmant.