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APPENDIX E
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water vapor from an area of high vapor pressure to one of lower ciples of environmental technologies as specified in Sections 10
• vapor pressure. and 11 of ASHRAE Standard 90B -1975.
WINDOW. See "Exterior Window." E301.1 Design parameters. For calculations under this section,
ZONE is a space or group of spaces within a building with heat- the following design parameters shall apply:
ing or cooling requirements sufficiently similar so that comfort The outside temperature shall be taken from the 97 percent
conditions can be maintained throughout by a single controlling winter temperature values and the 2 percent summer tempera -:
device. ture values listed in ASHRAE Handbook of Fundamentals,
1993 edition. For areas not listed, the designer should obtain the
most reliable design temperatures available. Selected values are
SECTION E301 subject to approval of the building officials. i
ALTERNATIVE SYSTEMS 1
I
Alternative building systems and equipment design may be ap- SECTION E401 i
proved by the building official when it can be demonstrated that EXTERIOR ENVELOPE REQUIREMENTS {
the proposed annual energy consumption will not exceed that of 1
a similar building with similar forms of energy requirements de- E401.1 General. The intent of this section is to provide mini -
signed in accordance with the provisions of this appendix. mum requirements for exterior envelope construction.
t
Proposed alternative designs submitted as requests for excep- All conditioned spaces within residential buildings shall com-
tion to the standard design criteria must be accompanied by an ply with the requirements of Table E401.1a or Table E401.1b
energy analysis prepared in accordance with established prin- and the remainder of Section E401.
i
TABLE E401.1 a
PRESCRI' 0 MPLIANCE PATHS FOR RESIDENTIAL BUILDINGS
PATH 1 I \'ATH 2 PATH 3 PATH 4 PATH 5 PATH 6 PATH 7 PATH 8 PATH 9
• BUILDING COMPONENTS Sun
Tempered4 Sun Sun Sun House Size Log Homes/
Tempered Tempered Tempered Umitede Solid Timber
Maximum Allowable Window Area No Limit No Limit No Limit No Limit No Limit No Limit No Limit 12% No Limit
Window Class U=0.40 U=0.40 U=0.50 U3.50 U=0.60 U=0.60 U0.60 U=0.40 U1.40
Doors, other than main entry U=0.20 U [1.20 U=0.20 U:).20 U -0.20 U =0.20 U=0.20 U=0.20 UO.54
Main Entry Door, maximum 24 square fe U=0.54 U3.54 U=0.20 U=O.20 U3.20 U =0.20 U -0.54 Ulo.20 U:).54
Wall Insulation R -21 R -15 R -21A R -15A R -24A R -21A R -21A R -15 -
Underfloor Insulation R -25 R -21 R -25 R -21 R -30 R -21 R -25 R -21 R -30
Flat Ceilings R -38 R -49 R -49A R -38 R -49A R -49A R -49A R -49 R -49
Vaulted Ceilings R -30 R-30" R -30 R -38 R -38 R -38 R -38 R -38 R -38
Skylight Class U=0.50 U=0.50 U=0.50 UT).50 U=0.50 U=0.50 U -0.50 U =0.50 U=0.50
Skylight Areal'- <2% <2% <2% <2% <2% <2% <2% <2% <2%
Basement Walls R -21 R -21 R -21 R -21 R -21 R -21 R -21 R -21 R -21
Slab Floor Edge Insulation R -15 R -15 R -15 R -15 R -15 R -15 R -15 R -15 R -15
Forced Air Duct Insulation R -8 R -8 R -8 R -8 R -8 R -8 R -8 R -8 R -8 •
For SI: 1 inch = 25.4 mm. 1 square foot = O. , 929 m
'Path 1 is based on cost effectiveness. Paths 2- • c . - - don energy equivalence with Path 1. Cost effectiveness of Paths 2 -9 not evaluated.
2 M allowed in current Section E401.1, thermal performance of a component may be adjusted provided that overall heat loss does not exceed the total resulting from
conformance to the required U -value standards. Calculations to document equivalent heat loss shall be performed using the procedure and approved U- values con-
tained in Table E401.1b.
3 R- values used in this table are nominal, for the insulation only and not for the entire assembly. The wall component for Path 9 shall be a minimum solid log or timber
wall thickness of 3.5 inches.
4 The sun - tempered house shall have one lot line which borders on a street within 30 degrees of true east -west and 50 percent or more of the total glazing for the heated
space on the south elevation. An approved alternate to street orientation based on solar design and access shall be accepted by the building official.
5 Path 8 applies only to homes with less than 1,500 square feet heated floor space and glazing area less than 12 percent of heated space floor area.
6 Reduced window area may not be used as a trade -off criterion for thermal performance of any component, except as noted in Table £401.lb.
7 Window and skylight U- values shall not exceed the number listed. U- values may also be listed as "class" on some windows and skylights (i.e., CL40 is same as
U ).40).
8 A= advanced frame construction as defined in Section E401.5.1 for walls and Section E401.6 for ceilings.
9 R -14 Advanced Frame or 2 x 4 wall with rigid insulation may be substituted if total nominal insulation R -value is 18.5 or greater.
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