It's not always easy to tell when to replace your roof. According to the National Association of Home Builders, a roof can last anywhere from 20 to 50 years, depending on the materials used. Here are signs it might be time to replace your roof.

1. Shingle Granules in the Gutter

If you start to notice black grit or small pebbles in your gutters, this is a sign that your shingles are beginning to break down. As shingles age, they will lose some of their protective granules. These granules help protect your roof from the sun's UV rays and give it its color. Granules in your gutters indicate that your roof is nearing the end of its lifespan and will need to be replaced soon.

2. The Roof Sags or Dips

A sagging roof is generally the result of water damage or decay. If this is the case, you should contact a local roofer as soon as possible because your roof may be on the verge of collapsing. Missing shingles can also cause dips and sags. If there are holes where shingles have fallen off, moisture can get in and cause the supporting structure to deteriorate. This is why it's critical to fix any missing shingles right away.

3. High Energy Bills

High bills signify that your roof is no longer doing its job of insulating your home. This means that heat or cool air is escaping, causing your HVAC system to work overtime. This drives up your energy bills and can also lead to premature wear and tear on your HVAC system. If you've noticed a sudden spike in your energy bills, it's worth having a professional local roofer have a look at it.

4. Growth of Moss or Algae

Moss and algae can start to grow on your roof if it doesn't get enough sunlight. While this might not seem like a big deal, moss and algae can cause serious damage to your roof. The roots of these plants can work their way into the cracks of your shingles and cause them to break down. Moss and algae also hold moisture against your roof, leading to rot. If you see any growth on your roof, it's important to have it removed as soon as possible.

If you've noticed any of these signs, it's time to call a local roofer for an inspection. Don't wait until your roof starts leaking — by then, the damage will already be done. A new roof is a big investment, but it will pay off in the long run. For more information on roof replacement, check out our website or give us a call today.