| Component
|
Average Life Estimate in
Years |
|
Roof Covering |
| Asphalt roll |
5 to 15 |
| Asphalt Shingle - Standard |
12 to 15 |
| Asphalt Shingle - Premium |
15 to 30 |
| Fiberglass Shingle |
15 to 20 |
| Asbestos Cement |
40 to 80 |
| Slate Shingle |
40 to 80 |
| Wood Shake |
10 to 20 |
| Tar & Gravel |
15 to 25 |
| Metal |
60 |
|
Heating & Air Conditioning |
| Forced Air Furnace |
10 to 25 |
| Heat Pump |
10 to 15 |
| Central Air Conditioning |
10 to 15 |
| Window Air Conditioning |
10 to 20 |
| Gas Chillers |
8 to 15 |
| Hot water/steam boiler - steel weld |
15 to 30 |
| Hot water/steam boiler - iron cast
|
30 to 50 |
| Water/steam circulating pump
|
15 to 30 |
| Oil tank |
40 |
|
Plumbing |
| Gas hot water heater |
8 to 20 |
| Electric hot water |
10 to 15 |
| Private disposal system (septic) |
10 to 15 |
| Galvanized water pipes |
30 to 50 |
| Well pump |
10 |
|
Appliances |
| Dishwasher |
5 to 12 |
| Disposals |
5 to 12 |
| Washers and dryers |
5 to 15 |
| Refrigerators |
15 to 20 |
| Oven/range |
15 to 20 |
|
Gutters and downspouts |
| Galvanized |
15 to 20 |
| Copper |
60 |
