Do you know for certain how old your roof is? Have you ever had your roof inspected by a roofing professional? If you answered "no" to either of these questions, and especially if you answered "no" to both, it's probably about time that you gave your roof some more serious consideration. These days, it's not unusual for homes to switch owners multiple times since the roof was last put on. This can muddy the waters, and like a game of telephone, the actual dates may be distorted. For instance, instead of having been replaced in 1998 and only being about 2 decades old, perhaps the roof was last replaced in 1989 and is at or is nearing the end of its lifespan. If you're still wondering if you need to care even though you don't see any leaks, here are some tell-tale signs that something may be amiss:
Musty smell that doesn't go away: It's possible that your roof is leaking, just not enough for it to come through your ceiling quite yet. Even small amounts of moisture can promote various types of wood rot, mold, and mildew. If you've been cleaning and cleaning and can't get rid of an odd smell, it's possible that you are in need of a roofing replacement. The only way to find out is to have your roof inspected by a professional.
Uneven roof: No matter what type of roof you have, shingles should all lie relatively flat in comparison to one another. An uneven roof can take many forms, such as shingles that are out of place or even a roof that is starting to sag. If you notice anything like this, you should call a professional right away. You may need a full roofing replacement, or it's possible that you simply need a small section of your roof repaired.
Discoloration: In some areas of the country, it's not uncommon to see roofs covered in dark streaks as a result of algae growth. Although unsightly, this doesn't mean that you are in need of a roofing replacement. However, if your roof is discolored in patches instead of streaks, then there may be something amiss. Things like heat damage or sun damage could have drastic impacts on both the color of the shingles and of their lifespan. If your roof looks in any way amiss, it's best to be safe and have an inspection done as soon as possible.