R-Values

Resistance Values of Structuraland Finish Materials

MATERIAL R-VALUE MATERIAL R-VALUEWood bevel siding, ½" x 8", lappedWood siding shingles, 16", 7 ½" exposureAsbestos-cement shinglesStucco, per inchBuilding paper, permeable felt½" Nail-base insulation board sheathing½" Insulation board sheathing, intermediate density½" Insulation board sheathing, regular density25/32" Insulation board sheathing, regular density1/4" Plywood3/8" Plywood½" Plywood5/8" Plywood1/4" Hardboard, high-density, standard tempered1/4" Hardboard, underlayment5/8" Particleboard, underlaymentSoftwood, per inchSoftwood board, 3/4" thickConcrete blocks, three oval cores Cinder aggregate, 4" thick Cinder aggregate, 12" thick Cinder aggregate, 8" thick Sand and gravel aggregate, 8" thick Lightweight aggregate (expanded clay, shale, slag, pumice, etc.), 8" thick

Concrete blocks, two rectangular cores Sand and gravel aggregate, 8" thick Lightweight aggregate, 8" thick

Common brick, per inchFace brick, per inchSand and gravel concrete, per inchSand and gravel concrete, 8" thick½" Gypsumboard5/8" Gypsumboard½" Lightweight aggregate gypsum plaster3/4" Hardwood finish flooringAsphalt, linoleum, vinyl, or rubber floor tileCarpet and fibrous padCarpet and foam rubber padAsphalt roof shinglesWood roof shingles3/8" Builtup roof

Insulation, mineral wool blanket and batt Approximately 3" to 3 ½" thick Approximately 5 1/4" to 6 ½" thick Approximately 6" to 7" thick Approximately 8 ½" to 9" thick Approximately 12" thickInsulation board Glass fiber, organic bonded, 1" Expanded polystyrene, extruded, cut cell, 1" Expanded polystyrene, extruded, smooth, 1" Expanded polystyrene, molded beads, 1" Expanded polyurethane, 1" or more Polyisocyanurate, 1" Mineral fiber with resin binder

0.81 0.87 0.03 0.20 0.06 1.14 1.22 1.32 2.06 0.31 0.47 0.62 0.77 0.25 0.31 0.82 1.25 0.94

1.11 1.89 1.72 1.11

2.00

1.04 2.18

0.20 0.11 0.08 0.64 0.45 0.56 0.32 0.68 0.05 2.08 1.23 0.44 0.94 0.33

11.0019.0022.0030.0038.00

4.00 4.00 5.00 3.57 6.25 7.20 3.45

Insulation blown loose fill Cellulosic, per inch Perlite expanded, per inch Mineral fiber (rock, slag, glass) 3 3/4" to 5" 6 ½" to 8 3/4" 7 ½" to 10" 10 1/4" to 13 3/4" 13" to 17 1/4"Vermiculite exfoliated, per inch

Air spaces (3/4")* Heat flow up Nonreflective

Reflective, one surface

Heat flow down Nonreflective

Reflective, one surface

Heat flow horizontal Nonreflective

Reflective, one surface

Inside Surface air films, inside (still air) Heat flow up (through a horizontal surface) Nonreflective Reflective Heat flow down (through a horizontal surface) Nonreflective Reflective Heat flow horizontal (through a vertical surface) Nonreflective

Outside Surface air films Heat flow in any direction, surface in any position 15-mph wind (winter) 7.5-mph wind (summer)

Glass Single glass, winter Single glass, summer Insulating glass, double 3/16" Air space, winter 3/16" Air space, summer 1/4" Air space, winter 1/4" Air space, summer ½" Air space, winter ½" Air space, summer Storm windows 1" to 4" air space, winter 1" to 4" air space, summer Triple glass Winter Summer

3.13-3.70 2.70

11.0019.0022.0030.0038.00 2.13-2.27

0.75 (summer) 0.87 (winter) 2.22 (summer) 2.21 (winter)

0.85 (summer) 1.02 (winter) 3.29 (summer) 3.59 (winter)

0.84 (summer) 1.01 (winter) 3.24 (summer) 3.46 (winter)

0.61 1.32

0.92 4.55

0.68

0.17 0.25U-VALUE

1.10 1.04

0.62 0.65 0.58 0.61 0.49 0.56

0.50 0.50

0.31-0.39 0.39-0.44