Shorter lifespan: As you might expect, new shingles placed on damaged shingles and rotten roofs won't last as long as they could. To make matters worse, a roof with two layers of shingles retains more heat, accelerating deterioration. On average, a coat lasts about 16 years. The second layer of shingles will trap heat, which can cause both layers of the roof to decay.
This will force you to replace the roof ahead of schedule. In fact, the additional layer can reduce the lifespan of the roof by up to 40%. With this extra weight, you can put your roof system at risk of sinking between the rafters, which can trap moisture and cause serious damage. Clay tile roofs are especially popular in hot, sunny climates, where the intense heat of the sun can soften the underside of asphalt shingles, weakening adhesion and causing roof leaks.
Having an old layer of shingles under the new layer accelerates that process, since the original layer retains a lot of heat. Adding another layer of shingles seems like it would save you money by not having to pay your contractor to tear up your old roof. It's time to buy a new roof when it reaches its maximum expected lifespan, even if it still looks good. Replacing an asphalt or architectural roof can take approximately 3 to 5 days, depending on the weather and the size and complexity of the job.
A potential disadvantage of metal roofs is that they can get dented by falling tree branches or large hail. In contrast, architectural tiles (see below) incorporate several layers of material to create a layered construction that mimics the appearance of individual tiles, giving the roof a more visually interesting dimensional appearance. Read on to learn how long different types of shingles are likely to last, so you can better determine when your roof will need to be replaced. Dents are practically impossible to remove and can often be seen from a distance, which spoils the appearance of the roof.
A regular installation can reduce a 50-year ceiling to 25 years of service, reducing the cost-effectiveness of your coverage accordingly. These multiple laminated layers that improve their durability also allow them to mimic the patterns and textures found in more expensive materials, such as wood, slate and tiled roofs. Slate, a natural metamorphic stone with a fine-grained appearance, is perfect for cutting even tiles. Overall, today's solar roof tiles produce approximately 23 percent less energy than standard solar panels.
When you place new shingles on top of existing damaged roof tiles, you'll notice some strange imperfections or bumps that can get through your new roof. In general, roofs can last between 20 and 100 years, depending on the materials used, the quality of the workmanship and the climate.