10,000 ft2 roof system Black membrane White membrane Difference
R1 $40.8 $18.00 $22.80
R5 $8.16 $3.60 $4.56
R 10 $4.08 $1.80 $2.28
R 15 $2.72 $1.20 $1.52
R 20 $2.04 $0.90 $1.14
R 30 $1.36 $0.60 $0.76

Table 1 Daily energy cost due to roof design only

The difference between a clean white membrane versus a dirty white membrane
on a dead-flat roof or a ballasted system can be quantified in Table 2 below:

10,000 ft2 roof system Beige, dirty white or ballasted membrane White membrane Difference
R1 $24.00 $18.00 $6.00
R 5 $4.80 $3.60 $1.20
R 10 $2.40 $1.80 $0.60
R 15 $1.60 $1.20 $0.40
P 20 $1.20 $0.90 $0.30
R 30 $0.80 $0.60 $0.20

Table 2 Daily energy cost due to roof design only