Can you roof over old shingles?

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”).

Is it OK to put a second layer of shingles on a roof?

A second layer of shingles will decrease the integrity of your new roof and lower its lifespan. That’s because shingles aren’t designed to have a second layer of shingles on top of them! Plus, all that extra moisture and heat being applied to the first layer of shingles will make that first layer age faster.

Can you add a layer of shingles to a 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.

How much does it cost to put new shingles over old shingles?

On average, most homeowners pay between $8,000 and $9,000 to install new shingles, with low costs in the $5,000s and high costs pushing into the $12,000s and higher.

Price of Roofing Shingles Per Square Foot.

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Roof Area Cost of Shingles
Roof Area Cost of Shingles
750 square feet $700 – $800
1,000 square feet $910 – $1,100

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.

How long does a reroof last?

The 26 gauge and 29 gauge cheaper metal roofing options can last for up to 25 years if taken care of. On the high-end, the 24 gauge metal roofing option can last for up to 50 years. However, most manufacturers offer a 20-year warranty and some even a lifetime warranty which is dependent on the metal used.

How many layers of roof shingles are allowed?

Most building codes allow two layers of organic or fiberglass asphalt shingles on roofs with a 4/12 pitch or less, and three layers on steeper roofs. If the structure can support the added weight, a typical 20-square (2,000-square-foot) reroof will cost at least $1,000 less than a tear-off job.

Can you put a roof over an existing roof?

Roofing over an existing roof is also called reroofing or an overlay. It is the process where roofers install a new roof over your existing one, i.e. add a new layer of shingles, which means that there is no tearing off of the old roof.