building material r-values

Tables 3-17(10/00)

En

velop

e

WALL FRAMING & INSULATION R-VALUESTable 3a

WallFraming

This table can beused to find the R-value for wallframing withinsulation. Thevalues can beadded to the R-values of otherlayers to calculatethe total R-value(Rt) of the wall.

Wood framingvalues are basedon 20 percent and15 percent framingfactors for 16- and24-inch spacingwith compression ofinsulation ifnecessary. Framingfactor is thepercentage of a wallsurface backed byframing. R-value forwood is based onfir, pine and similarsoftwood.

Metal framingvalues are fromASHRAE 90.1-1989Table 402.1.2.1b.

Type of Insulation EffectiveFraming Spacing R-value R-value

Wood, 2 x 2 16" o.c. 5 3.757 4.55

24" o.c. 5 4.007 4.97

Wood, 2 x 4 16" o.c. 11 8.4713 9.3615 10.13

24" o.c. 11 8.9913 10.0615 11.03

Wood, 2 x 6 16" o.c. 19 13.6421 14.94

24" o.c. 19 14.5221 16.10

Wood, 2 x 8 16" o.c. 19 15.8121 16.8830 20.51

24" o.c. 19 16.5021 17.7530 22.13

Metal, 2 x 4 16" o.c. 11 5.5013 6.00

24" o.c. 11 6.6013 7.20

Metal, 2 x 6 16" o.c. 19 7.10

24" o.c. 19 8.60

CavityFilled

Some R-values arenot includedbecause theOregon coderequires that wallcavities 6 inches orless be filledcompletely.

3-18 Tables (10/00)

En

velo

pe


Wood, 2 x 6 16" o.c. 11 10.3913 11.9515 13.4419 15.5221 17.46

24" o.c. 11 10.6313 12.3515 14.0219 16.4321 18.72

Wood, 2 x 8 16" o.c. 13 12.5319 17.2625 20.12

24" o.c. 13 12.7119 17.9125 21.18

Wood, 2 x 10 16" o.c. 19 17.9525 22.5530 26.0738 31.21

24" o.c. 19 18.3525 23.4730 27.5138 33.61

Wood, 2 x 12 16" o.c. 19 18.4325 23.3130 27.1038 32.70

24" o.c. 19 18.6525 23.9630 28.1938 34.63

Table 3a (cont.)

ROOF & FLOOR FRAMING R-VALUES

Roof/Ceiling andFloorFraming

Use this table tofind the R-value forinsulation andframing in roofs,ceilings or floors.The values in thistable can be addedto the R-values ofother layers tocalculate the totaleffective R-value ofthe framingassembly.

Wood framingvalues are basedon 10 percent and 6percent framingfactors for 16- and24-inch spacingwith compression ofinsulation ifnecessary. R-valuefor wood is basedon fir, pine andsimilar softwood.

Tables 3-19(10/00)

En

velop

e

Table 3a (cont.)


Metal Truss 4'0" o.c. or greater 5 4.810 9.215 13.220 17.025 20.330 23.735 26.640 29.2

Engineered wood 16" o.c. 11 10.2composite I-beam 13 12.0

19 17.525 23.030 27.6

24" o.c. 11 10.513 12.319 18.025 23.730 28.4

48" o.c. 11 10.713 12.719 18.525 24.330 29.2

ROOF & FLOOR FRAMING R-VALUES

Roof/Ceilingand FloorFraming

Use this table to findthe R-value forframing and framingcavity in roofs,ceilings or floors.The values in thistable can be addedto the R-values ofother layers tocalculate the totaleffective R-value ofthe framingassembly.

For compressed-type batt insulation,see page 3-25 foreffective U-factors.

Metal truss valuesare from ASHRAE90.1-1989, Table402.1.2.1a. Valuesare based on 0.66-inch diameter crossmembers every onefoot.

Engineered woodcomposite I-beams(e.g.,“silent floor”)are composite woodmaterials with an I-beam cross section.These are typicallymade of strandboardor plywood withsmall dimensionallumber on the topand bottom cords.

3-20 Tables (10/00)

En

velo

pe

BuildingBoard

Description Detail R-value lb/ft2

Cement BoardCement board 0.125 0.03 1.25Cement board 0.25 0.06 2.50Cement board 0.375 0.09 3.75

Ceiling finishesAcoustic tile 3⁄8" mineral fiberboard 0.95 0.56Acoustic tile 3⁄4" mineral fiberboard 2.48 1.31

Gypsum or plaster boardGypsum wallboard 3⁄8" 0.32 1.56Gypsum wallboard 1⁄2" 0.45 2.08Gypsum wallboard 5⁄8" 0.50 2.33Gypsum wallboard 3⁄4" 0.56 2.60

HardboardMedium density 1⁄4" 0.34 1.04High density 1⁄4" 0.25 1.31High density 1⁄2" 0.50 2.62High density 3⁄4" service tempered 0.92 3.43

ParticleboardLow density 1" (per inch value) 1.41 3.08Medium density 1" (per inch value) 1.06 4.17High density 1" (per inch value) 0.85 5.20Underlayment grade 5⁄8" underlayment 0.82 2.08Waferboard 1" (per inch value) 1.59 3.08

PlywoodDouglas-fir 1⁄4" 0.31 0.71Douglas-fir 3⁄8" 0.47 1.06Douglas-fir 1⁄2" 0.62 1.42Douglas-fir 5⁄8" 0.77 1.77Douglas-fir 3⁄4" 0.93 2.13Douglas-fir 1" 1.25 2.84

Vegetable fiber boardSheathing, regular density 1⁄2" 1.32 0.75Sheathing, intermediate density 1⁄2" 1.09 0.92Sheathing, regular density 25⁄32" 2.06 1.17Nail-base sheathing 1⁄2" 1.06 1.04Sound deadening board 1⁄2" 1.35 1.25Tile and lay-in panels, plain or acoustic 1⁄2" 1.25 1.50Laminated paperboard 1" 2.00 2.50

Building membraneVapor-permeable felt 0.06 –Vapor seal 2 layers/mopped 15 lb felt 0.12 –Vapor seal Plastic film 0.00 –

Floor finishesCarpet with fibrous pad 2.08 –Carpet with rubber pad 1.23 –Cork tile 1⁄8" 0.28 –Terrazzo 1" 0.08 11.67Resilient tile – 0.05 –Hardwood 3⁄4" 0.68 2.00

Table 3b

BUILDING MATERIAL R-VALUES

BuildingMembrane

FinishFlooringMaterials

Tables 3-21(10/00)

En

velop

e


InsulatingMaterials

Table 3b (cont.)


Cement BoardBatt and blanket insulation – uncompressedMineral fiber batt approx. 2 to 23⁄4" 7 0.25Mineral fiber batt approx. 3 to 4" 11 0.30Mineral fiber batt approx. 31⁄2" 13 0.35Mineral fiber batt approx. 31⁄2" 15 0.40Mineral fiber batt approx. 51⁄2 to 61⁄2" 19 0.60Mineral fiber batt approx. 51⁄2" 21 0.65Mineral fiber batt approx. 6 to 71⁄2" 22 0.65Mineral fiber batt approx. 81⁄4 to 10" 30 0.95Mineral fiber batt approx. 10 to 13" 38 1.20

Board and slab insulationCellular glass 1" 3.03 0.67Glass fiber, organic bonded 1" 4.00 0.50Expanded perlite, organic bonded 1" 2.78 0.09Expanded rubber (rigid) 1" 4.55 0.35Foamed urethane board 1" 7.15 0.54Fiberglass urethane board 1" 5.56 0.36

Polystyrene, extruded (smooth skin) 1", 1.8 to 3.5 lb/ft3 5.00 0.22Expanded polystyrene, molded beads 1", 1.0 lb/ft3 3.85 0.08Expanded polystyrene, molded beads 1", 1.25 lb/ft3 4.00 0.10Expanded polystyrene, molded beads 1", 1.5 lb/ft3 4.17 0.13Expanded polystyrene, molded beads 1", 1.75 lb/ft3 4.17 0.15Expanded polystyrene, molded beads 1", 2.0 lb/ft3 4.35 0.17

Cellular polyisocyanurate 1", with foil face, 2.0 lb/ft3 7.04 0.17Cellular polyisocyanurate 1", gas-perm. facers, 1.5 lb/ft3 5.56 0.13Cellular polyisocyanurate 1" unfaced, 1.5 lb/ft3 5.56 0.13

Cellular phonolic 1", 3.0 lb/ft3 closed cell 8.20 0.25Cellular phonolic 1", 1.8 to 2.2 lb/ft3 open cell 4.40 0.16Mineral fiber 1", 15.0 lb/ft3 with resin binder 3.45 1.25Mineral fiber 1", 16 to 17 lb/ft3, not felted 2.94 1.35Cement fiber slabs (shredded wool) 1", 25 to 27 lb/ft3 with Portland cement 1.89 2.12Cement fiber slabs (shredded wool) 1", 22 lb/ft3 with magnesia oxysulfide 1.75 1.86

Loose fillCellulosic (milled paper and wood pulp) 1" loose fill 3.20 0.24

Mineral fiber (rock, slab or glass) approx. 33⁄4 to 5", 0.6 to 2.0 lb/ft3 11.00 0.40Mineral fiber (rock, slab or glass) approx. 61⁄2 to 83⁄4", 0.6 to 2.0 lb/ft3 19.00 0.80Mineral fiber (rock, slab or glass) approx. 71⁄2 to 10", 0.6 to 2.0 lb/ft3 22.00 1.00Mineral fiber (rock, slab or glass) approx. 101⁄4 to 133⁄4", 0.6 to 2.0 lb/ft3 30.00 1.20

Perlite, expanded 1", 7.4 to 11.0 lb/ft3 2.4 0.48Vermiculite 1" exfoliated 7 to 8.2 lb/ft3 2.13 0.63Vermiculite 1" exfoliated 4 to 6 lb/ft3 2.27 0.42

Spray appliedUreaformaldehyde foam 1" sprayed, 0.7 to 1.6 lb/ft3 3.57 0.07Cellulosic fiber 1" spray applied 2.94 0.30Polyurethane foam 1" sprayed 5.56 0.20Glass fiber 1" sprayed 3.70 0.30

3-22 Tables (10/00)

En

velo

pe

BUILDING MATERIAL R-VALUESTable 3b (cont.)


BrickPaver 3⁄8" thick, 120 lb/ft3 0.30 10.00

Face brick, fired clay 4", medium weight (110 lb/ft3) 0.68 37.00Face brick, fired clay 4", heavy weight (140 lb/ft3) 0.44 47.00

6" hollow brick unfilled 1.23 34.006" hollow brick perlite filled cores 3.80 35.006" hollow brick vermiculite filled cores 3.50 36.006" hollow brick solid grouted 0.76 59.00

8" hollow brick unfilled 1.28 39.008" hollow brick perlite filled cores 4.60 41.008" hollow brick vermiculite filled cores 4.21 41.008" hollow brick solid grouted 0.94 82.00

ConcretesSand and gravel 1" thick 0.08 11.67Concrete – heavy 1" thick, 140 lb/ft3 0.09 11.67Concrete – medium 1" thick, 120 lb/ft3 0.14 10.00Concrete – light 1" thick, 100 lb/ft3 0.19 8.33Concrete mortar, stucco 1" thick, 120 lb/ft3 0.10 10.00Concrete mortar, stucco 1" thick, 100 lb/ft3 0.15 8.33Concrete mortar, stucco 1" thick, 80lb/ft3 0.22 6.67Foam concrete (non-structural) 1" thick, 100 lb/ft3 0.24 8.33Foam concrete (non-structural) 1" thick, 60 lb/ft3 0.48 5.00

StoneSlag or stone 1" 0.10 14.00Slate 1⁄2" 0.05 5.83

Clay tile4" hollow 1 cell deep 1.11 —6" hollow 2 cells deep 1.52 —8" hollow 2 cells deep 1.85 —10" hollow 2 cells deep 2.22 —12" hollow 3 cells deep 2.50 —

Gypsum tileGypsum partition tile 3" x 12" x 30", 3 cells 1.35 —Gypsum partition tile 3" x 12" x 30", 4 cells 1.67 —Gypsum partition tile 3" x 12" x 30", solid 1.26 —

Glass block4" thick block 8" x 8" x 4" 0.51 —

Gypsum plasterCement 120 lb/ft3 0.21 7.5Lightweight aggregate 1⁄2", 45 lb/ft3 0.32 1.9Lightweight aggregate on metal lath 3⁄4", 45 lb/ft3 0.47 4.0Perlite aggregate 1⁄2", 45 lb/ft3 0.34 1.9Sand aggregate 1⁄2", 105 lb/ft3 0.09 4.4Sand aggregate 5⁄8", 105 lb/ft3 0.11 5.5Sand aggregate on metal lath 3⁄4", 105 lb/ft3 0.13 5.0Vermiculite aggregate 1⁄2", 45 lb/ft3 0.30 1.9

MasonryMaterials

Plastering

Tables 3-23(10/00)

En

velop

e

BUILDING MATERIAL R-VALUESTable 3b (Cont.)


CMU Block - Light-weight (100 lb/ft3 concrete)

6"block all cores filled solid grouted 0.70 55.8

8" block 40" o.c. no insulation 1.23 47.4loose fill 2.31 48.6foam 2.50 48.6

32" o.c. no insulation 1.21 49.1loose fill 2.16 50.2foam 2.32 50.2



all cores filled solid grouted 0.90 74.9






CMU Block – Medium-weight (120 lbs/ft3 concrete)

6"block all cores filled solid grouted 0.55 60.6











Concrete-filledcores may containrebar or otherreinforcements.Grout fill used isassumed to have adensity of 140 lb/ff3.

R-values for CMUblocks are based onNational Concreteand MasonryAssociationpublication: “R-Values for SingleWythe ConcreteMasonry Walls, TEK6-2A.” Values arebased upon the mid-range values.

Loose-fill insulationvalues are based onvermiculite.

Horizontal bond-beams (grout/steel)located every 48".

CMU Block

3-24 Tables (10/00)

En

velo

pe


Table 3b (cont.)

SidingMaterials

Roofing

Wood andWoodProducts


RoofingAsphalt roll roofing — 0.15 5.83Asphalt shingles — 0.44 5.83Built-up roofing 3⁄8" 0.33 5.83Slate 1⁄2" 0.05 5.83Wood shingles Plain and plastic film-faced 0.94 1.50

Ceramic tile 1⁄4" 0.20 5.83Metal, any — 0.00 —

ShinglesCement — 0.21 7.5Wood 16", 7.5" exposure 0.87 1.3Wood double 16", 12" exposure 1.19 2.3Wood plus 0.312" insulated backer board 1.40 2.0

SidingCement 1⁄4" lapped 0.21 8.0Asphalt roll siding — 0.15 10.0Asphalt insulating siding 1⁄2" bed. 1.46 —Hardboad siding 0.4375 inch 0.67 —Wood, drop 1" by 8" 0.79 2.13Wood, bevel 1⁄2" by 8" lapped 0.81 1.30Wood, bevel 3⁄4" by 10" lapped 1.05 2.00Plywood 3⁄8" lapped 0.59 1.00Glass 1⁄4" curtain wall 0.43 —Aluminum or steel siding Hollow-backed 0.61 —Aluminum or steel siding 3⁄8" insulation board backed 1.80 —Aluminum or steel siding 3⁄8" insulation and foil backed 2.96 —

Plywood1⁄4" Douglas-fir 0.31 0.713⁄8" Douglas-fir 0.47 1.061⁄2" Douglas-fir 0.62 1.425⁄8" Douglas-fir 0.77 1.773⁄4" Douglas-fir 0.93 2.131" Douglas-fir 1.24 2.84

WoodsHardwoods 1" 0.91 2.67Fir, pine and similar softwoods 3⁄4" 0.94 2.00

11⁄2" 1.89 4.0021⁄2" 3.12 6.6731⁄2" 4.35 9.3351⁄2" 6.88 14.6671⁄4" 9.04 19.3291⁄4" 11.56 24.65111⁄4" 14.06 29.99

Tables 3-25(10/00)

En

velop

e

System 1(Roof and Wall)

METAL BUILDING U-FACTORS

Table 3c

NAIMA 202Insulation

NAIMA 202Insulation

Cross band

System 2(Roof only)

System 3(Roof only)

NAIMA 202 insulation

FillerInsulation

Thermal block

System 4(Roof only)

FillerInsulation

Bands to supportinsulation

NAIMA 202 insulationCross band

Bands to support insulation

Vapor retarder overlap

System 1In this system, NAIMA 202 fiber glass blanket insulationis rolled out over, and perpendicular to the structuralframe. The metal covering sheets are fastened to theframe, holding the insulation in place.U-factors

R10 R11 R13 R19

0.133 0.127 0.114 0.091

System 2This method accommodates thicker insulation withoutcompression at the structural members by applying thefaced NAIMA 202 between the purlins rather thanperpendicular to them. There is, however, the problemof thermal bridging through the structural members indirect contact with the metal covering sheets.U-factors

R10 R11 R13 R19

0.131 0.123 0.107 0.079

System 3Vapor retarder faced NAIMA 202 insulation is installedover and perpendicular to the structure (joists or purlins)prior to applying the roof. Additional unfaced fiber glassblanket filler insulation can then be applied between thepurlins and over the first layer to fill the space formed bythe roof sheet standoffs. Thermal blocks of rigid foamare placed over joists or purlins where faced insulationwill be compressed.U-factors

R10 R11 R13 R19

0.102 0.096 0.084 0.065

System 4This system uses a vapor retarder faced NAIMA 202blanket between the purlins with the retarder overlappingon the top face of the purlins. Plain filler blanket isinstalled as a second layer, also between the purlins.Rigid foam thermal blocks are placed on top of thepurlins to create a thermal break at the structuralmembers.U-factors

R10 R11 R13 R19 R30

0.099 0.093 0.080 0.059 0.041Vapor retarder overlapand thermal block

3-26 Tables (10/00)

En

velo

pe

Table 3d

SURFACE AND AIR SPACE R-VALUES


Still air to surfaceWall — 0.68 —Roof — 0.61 —Floor — 0.92 —Vaulted ceiling — 0.62 —

Moving air to surface15 mph — 0.17 —7.5 mph — 0.25 —

Walls 3⁄4" 0.94 —11⁄2" 0.90 —31⁄2" 0.91 —

Roofs 3⁄4" 0.77 —11⁄2" 0.80 —31⁄2" 0.84 —

Floors 3⁄4" 1.02 —11⁄2" 1.14 —31⁄2" 1.22 —

Vaulted Ceilings 3⁄4" 0.82 —11⁄2" 0.84 —31⁄2" 0.86 —

Surfaces

Air Spaces

Tables 3-27(10/00)

En

velop

eTable 3e

WINDOW U-FACTORS

Values are basedon the 1997ASHRAE Handbookof FundamentalsTable 29-5, forfixed-framewindows. Operablewindows will havehigher U-factors.

Many window typesare not representedin the table, and theuser must providemanufacturer testresults.

Interpolate betweenemissivities whenneeded. Whenmanufacturers’ dataare not available,assume that glasswith a pyrolytic(hard) coating hasan emissivity of0.40, and that glasswith a sputtered(soft) coating hasan emissivity of0.10.

Krypton gas fills, orkrypton/argoncombinations, canbe substituted forargon.

For glazing gapsbetween 1⁄4 inch and1⁄2 inch, use 1⁄4 inch.

For glazing gapsover 1⁄2 inch, use1⁄2 inch.

U-Factors

Single Glazing 1⁄8" glass 1.04 1.13 1.07 0.98 0.98 0.94 1⁄4" acrylic/polycarb 0.88 0.99 0.92 0.84 0.84 0.81 1⁄8" acrylic/polycarb 0.96 1.06 1.00 0.91 0.91 0.87Double Glazing 1⁄4" airspace 0.55 0.69 0.63 0.56 0.56 0.53 1⁄2" airspace 0.48 0.64 0.57 0.50 0.50 0.48 1⁄4" argon space 0.51 0.66 0.59 0.53 0.52 0.50 1⁄2" argon space 0.45 0.61 0.54 0.48 0.48 0.45Double Glazing, e=0.40 1⁄4" airspace 0.49 0.64 0.58 0.51 0.51 0.49 1⁄2" airspace 0.40 0.57 0.50 0.44 0.44 0.41 1⁄4" argon space 0.43 0.59 0.53 0.46 0.46 0.44 1⁄2" argon space 0.36 0.53 0.47 0.41 0.40 0.38Double Glazing, e=0.20 1⁄4" airspace 0.45 0.61 0.54 0.48 0.48 0.45 1⁄2" airspace 0.35 0.53 0.46 0.40 0.39 0.37 1⁄4" argon space 0.38 0.55 0.48 0.42 0.42 0.40 1⁄2" argon space 0.30 0.48 0.41 0.36 0.35 0.33Double Glazing, e=0.10 1⁄4" airspace 0.42 0.59 0.52 0.46 0.45 0.43 1⁄2" airspace 0.32 0.50 0.43 0.37 0.37 0.35 1⁄4" argon space 0.35 0.53 0.46 0.40 0.39 0.37 1⁄2" argon space 0.27 0.46 0.39 0.33 0.33 0.31Double Glazing, e=0.05 1⁄4" airspace 0.41 0.58 0.51 0.45 0.44 0.42 1⁄2" airspace 0.30 0.48 0.41 0.36 0.35 0.33 1⁄4" argon space 0.33 0.51 0.44 0.38 0.38 0.36 1⁄2" argon space 0.25 0.44 0.37 0.32 0.31 0.29Other Glass block 0.51

Aluminu

m

Aluminu

m w

ith T

herm

al Bre

ak

Reinfor

ced V

inyl o

r Alum

inum

Clad

FRAME TYPE

GLAZING TYPE

Center

of G

lass (

for re

feren

ce on

ly)

Woo

d or V

inyl

Insula

ted F

iberg

lass/V

inyl

Shaded values do not meet prescriptive path code requirement forclimate zone 1; i.e., they are greater than 0.54.

For climate zone 1 U-factor must be no greater than 0.54. For climatezone 2 U-factor must be no greater than 0.50.

3-28 Tables (10/00)

En

velo

pe

SKYLIGHT U-FACTORS

U-Factors

The values in thistable are from the1997 ASHRAEHandbook ofFundamentals,Table 29-5 formanufacturedskylights.

Table 3e (cont.)

SkylightConversion

Testing labs usuallytest skylights in avertical position.Manufacturers usethese numbers onskylight labels andin literature. If this isthe case, you mayuse the equation(right) to calculatethe actual skylightU-factor.

The equation below provides an alternate approach for converting from vertical glazing to skylights:

Skylight U-Factor = 0.06 + 1.07 x U-Factor*

*Tested in vertical orientation and certified in accordance with NFRC procedures

Single Glazing 1⁄8" glass 1.19 1.98 1.89 1.75 1.47 1⁄4" acrylic/polycarb 1.03 1.82 1.73 1.60 1.31 1⁄8" acrylic/polycarb 1.11 1.90 1.81 1.68 1.39Double Glazing 1⁄4" airspace 0.58 1.31 1.11 1.05 0.84 1⁄2" airspace 0.57 1.30 1.10 1.04 0.84 1⁄4" argon space 0.53 1.27 1.07 1.00 0.80 1⁄2" argon space 0.53 1.27 1.07 1.00 0.80Double Glazing, e=0.40 1⁄4" airspace 0.51 1.25 1.05 0.99 0.78 1⁄2" airspace 0.50 1.24 1.04 0.98 0.77 1⁄4" argon space 0.44 1.18 0.99 0.92 0.72 1⁄2" argon space 0.46 1.20 1.00 0.94 0.74Double Glazing, e=0.20 1⁄4" airspace 0.46 1.20 1.00 0.94 0.74 1⁄2" airspace 0.46 1.20 1.00 0.94 0.74 1⁄4" argon space 0.39 1.14 0.94 0.88 0.68 1⁄2" argon space 0.40 1.15 0.95 0.89 0.68Double Glazing, e=0.10 1⁄4" airspace 0.44 1.18 0.99 0.92 0.72 1⁄2" airspace 0.44 1.18 0.99 0.92 0.72 1⁄4" argon space 0.36 1.11 0.91 0.85 0.65 1⁄2" argon space 0.38 1.13 0.93 0.87 0.67Double Glazing, e=0.05 1⁄4" airspace 0.42 1.17 0.97 0.91 0.70 1⁄2" airspace 0.43 1.17 0.98 0.91 0.71 1⁄4" argon space 0.34 1.09 0.89 0.83 0.63 1⁄2" argon space 0.36 1.11 0.91 0.85 0.65

GLAZING TYPE

FRAME TYPE

Center

of G

lass (

for re

feren

ce on

ly)

Aluminu

m

Aluminu

m w

ith T

herm

al Bre

ak

Reinfor

ced V

inyl o

r Alum

inum

Clad

Woo

d or V

inyl

Shaded values do not meet prescriptive path code requirement; i.e.,they are greater than 1.23.

Tables 3-29(10/00)

En

velop

e

FENESTRATION SHADING COEFFICIENTSTable 3f

Values are from the1997 ASHRAEHandbook ofFundamentals,Table 29-11. Unlessotherwise noted,tinted glass andreflective glasscoatings are on theouter pane and low-e coatings areapplied to innerpane in double-glazed systems.

ShadingCoefficient

Oregon coderequires that thecenter-of-glassshading coefficientfor non-merchan-dise glazing be lessthan or equal to0.57.

SCc = ShadingCoefficient for theglazing system(center of glass)

SCc =

SHGCc = SolarHeat GainCoefficient (centerof glass)

e = Infraredemissivity of theglazing layer

SHGCc

0.87

Center-of-GlassShading Equivalent

Glazing Description Coefficient (SCc) SHGC

Single Glazing1⁄8" clear 1.00 0.871⁄4" clear 0.94 0.82Single acrylic or polycarbonate clear 0.98 0.85Single acrylic, gray or bronze 0.90 0.78Single 1⁄8" polycarbonate, gray or bronze 0.74 0.64

Glass BlockClear 0.65 0.57Frosted 0.50 0.44

Double Glazing – 1⁄8" thickclear 0.87 0.76bronze 0.72 0.63green or gray 0.70 0.61bronze, low-e with e=0.2 0.66 0.57green or gray, low-e with e=0.2 0.63 0.55tinted, low-e with e=0.1 0.57 0.50clear, low-e with e=0.05 0.48 0.42

Double Glazing – 1⁄4" thickclear 0.81 0.70clear, low-e with e=0.2 0.75 0.65clear, low-e on outer pane with e=0.2 0.70 0.61clear, low-e with e=0.1 0.66 0.57clear, low-e on outer pane with e=0.1 0.59 0.51bronze 0.59 0.51bluegreen 0.58 0.50green 0.54 0.47bronze, low-e with e=0.2 0.52 0.45gray 0.51 0.44green, low-e with e=0.2 0.48 0.42gray, low-e with e=0.2 0.46 0.40bronze or green, low-e with e=0.1 0.45 0.39clear, low-e on outer pane with e=0.05 0.43 0.37gray, low-e with e=0.1 0.40 0.35green, low-e on outer pane with e=0.05 0.35 0.30titanium reflective 0.33 0.29blue, low-e on outer pane with e=0.05 0.32 0.28gray, low-e on outer pane with e=0.05 0.27 0.23stainless steel reflective 0.26 0.23

Shaded values do not meet prescriptive path code requirement;i.e., the SCc is greater than 0.57.

building material r-values

Documents