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Shorter lifespan – As you might expect, new shingles laid over damaged shingles and rotting decking won’t last as long as they could. To make matters worse, a roof with two layers of shingles holds in more heat, which speeds up deterioration. On average, an overlay lasts around 16 years.
Is two layers of shingles OK?
Warranty issues: Most shingle warranties do not apply when shingles are layered over existing roofing, according to InterNACHI. Two layers of shingles trap more heat, which in turn damages the shingles and shortens the life span of the roof. Adding a second layer could compromise the structure of your roof.
How long does overlay roof last?
Overlays have a Viable Life An overlay is a viable option if the existing roofing materials have not already been overlaid. Home Reference.net notes that on average you can expect the overlay to last for fifteen or sixteen years.
How long does a double shingle roof last?
Dimensional shingles come with a 30-year manufacturer warranty. Vented properly and installed correctly, you should get around 80-85% of the life span out of an asphalt roof. That means you can expect to get about 20-22 years out of your 3-tab shingle roof and 25-28 years out of your dimensional shingles.
Can you put a second layer of asphalt shingles on my roof?
The short answer is yes, you can lay new roof shingles over the old ones. You can’t do it with wood or metal, for example, and you should never mix materials, such as laying asphalt shingles over cedar shakes. Also, the old roofing has to be in pretty good shape.
Can you shingle over one layer of shingles?
You might be able to lay new shingles over existing shingles and avoid the cost of tear-off. Some roofers install a layer of waterproof shingle underlayment (WSU) over the existing shingles at the eave end, as would be done for a roof laid on bare sheathing. This provides added protection against ice dams.
What are seconds shingles?
The product that has some color variations or imperfections are put aside as their overruns along with old stock. As a result we purchase these seconds and have a special team to sort the shingles. Waste is reduced and our customers are able to save money on products that would have otherwise ended up in a landfill.
How many times can you overlay a roof?
Installing new roof shingles over old effectively doubles the weight of the roofing, so you have to make sure your roof structure can handle the extra load. That’s also why building codes commonly limit re-roofing to no more than two layers.
Is it better to remove old shingles?
While a repair job can often be more convenient and somewhat more cost-efficient, placing new shingles over old ones is never a good idea. Whether repairing one section of roof, or a replacing a whole one, it’s always best to pull up the old shingles before putting down the new ones.
Is it better to tear off old shingles?
In most cases, more than two layers of roofing shingles does require a tear-off. Laying new shingles over old shingles is easily prone to leaks and reduces the life of the new shingles. This alone ought to be reason enough to do a tear-off; it’s just a bad value not to.
How long do 30 year shingles really last?
The truth is, a 30-year shingle will not really last 30 years. The expected service life of a 30-year product, if properly cared for, is approximately 25 years. If it’s not cared for properly, that 30 year shingle will only last 12 to 15 years.
How long should a new roof last without leaking?
For a standard 3-tab asphalt shingle roof, that’s 25-years. As long as your roof has been properly ventilated and installed you should get pretty close to that 25 years of roof life. So obviously you want to replace your roof before it starts leaking or fails completely.
What kind of roof lasts the longest?
Roofing material that lasts the longest are concrete, clay or slate tiles. These materials significantly outperform other natural products like wood shakes or any manufactured roofing materials including asphalt shingles and metal roofing. Although these materials have a good lifespan, they are not as durable.
Can you have 3 layers of shingles?
No, you can’t put three layers of asphalt shingles on a roof. In most states, you’re only allowed to have two layers of asphalt shingles on a roof for fire safety reasons. But that doesn’t mean you won’t still see roofs with three or four layers today.
How many layers of shingles can a roof have?
In most states, you’re only allowed to have 2 layers of shingles on a roof for fire safety reasons. However, you’ll still see roofs that have 3 or 4 layers today. If you already have 2 or more layers, a contractor will recommend a full replacement.
Do you overlap shingles side by side?
When you reach a peak or hip, shingle all the way up the first side (until the reveal portion of the shingles is within 4 inches of the peak) and cut the 3-tab shingles just below the ridge. Shingle the other side and allow these pieces to overlap the ridge by no more than 4 inches.
How do I know how many layers of shingles I need?
The easiest way to tell how many layers of shingles are on your roof is to climb up a ladder and examine the edges. Usually, the roofs have a base of shingles and then above it another layer of shingles. Whereas, a roof over has up to four layers of shingles. The layer can be easily seen from the edges.
