Interval
50+ Years
10 Years
2028
n/a
2048
n/a
2058
Foam
$439,000
$3,500
$148,750
n/a
$148,750
n/a
$148,750
$942,750
$18,855
Interval
17-20 Years
10 Years
n/a
2028
30 Years
2048
50 Years
Single-Ply
$530,000
$12,000
n/a
$487,050
$12,000
$530,000
$12,000
$1,583,050
$31,661
Application
Initial application
Anticipated maintenance
Re-coat foam #1
Install single ply roof #2
Re-coat foam #2
Install single ply roof #3
Re-coat foam #3
Totals:
Yearly Cost Comparison:
Notes:
Cost based upon 85,000 square feet.
Estimates are for budgeting purposes only. Actual prices may be higher.
No inflation factors figured in calculations.
Actual costs will be less since major outlays are in year fifty which will extend another 20 years.
Comments
Both estimates include tear off of existing flat roof(s). Single ply cost includes some leveling work to elimate low spots.
Routine preventative maintenance interval and cost, not simple roof cleaning.
Smaller or no tear-off.