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Warranty is one of the three important criteria for choosing solar panels after efficiency and cost. Solar panels are not installed for a day or a month. These offer the most promising source of power in regions that receive a sufficient amount of sunlight. Thus, one should check the warranty period, which should be approximately 10 to 25 years.

Most experts agree that a typical roof will last between 20 and 25 years. It also depends on whether the old roof was removed and you only have one layer of shingles, and if it is properly ventilated.

Tile and Asphalt are the most used materials for roofing, and they're manufactured with the usage of concrete, clay or oil. The rise of oil prices can directly impacted asphalt shingles to become more costly. Furthermore, the cost of disposing old and damaged materials has also increased in the recent years.

Solar power, like other renewable energy resources, has many environmental and health benefits. Going solar reduces greenhouse gas emissions, which contribute to climate change, and also results in fewer air pollutants like sulfur dioxide and particulate matter, which can cause health problems.

Some people often assume that anything that is costly is always better. However, this is not always true. The industry is brimming with several types of solar panels that are quite costly but not primarily efficient. Hence, one should definitely choose an affordable alternative that is equally efficient in the long run.

The answer is yes, you can lay new roof shingles over old ones. But before we get started, one thing must be clear: adding new roofing over old (sometimes called a "re-roof") is possible only with asphalt shingles (also called "composition shingles").