Can you 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 the old roof will not be removed/teared off.

How long does a roof overlay last?

On average, an overlay lasts around 16 years. That said, for most shingles, the warranty is valid for the same length of time whether the shingles were used in an overlay or a tearoff.

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

“Can I put a second layer of shingles on my roof?” You can, but you probably shouldn’t! Known as a layover, putting a second layer of shingles on your roof is in most cases inadvisable and a job that Proven Roofing is likely to even turn down.

Do I need to remove old shingles before installing new 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.

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When can you shingle over an existing roof?

Shingles are designed for flat surfaces.

Re-roofers have tricks to lay new roof shingles over old so that the same step-ups between courses are maintained, but if any old shingles are cupped, curled, or otherwise misshapen, those defects will “telegraph” through to the new layer.

Is it bad to overlay a roof?

A: In general, it is not good practice to overlay a traditional asphalt shingle roof versus a complete tear off and replacement for the very reason you stated: you can’t examine the decking to determine if there is any damage that needs repaired.

Should I tear off my old roof?

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 much does it cost to put a second layer of shingles on a roof?

ft. The cost per square depends on the type of shingles and the brand. They generally range between $55 on the low end and $600 on the high end, with an average of $100 to $250 per square of architectural shingles. The roofing labor cost per square is $100 to $250.

How many times can you shingle over a roof?

Depending on the type of roof material used, the number of layers added to a roof range from two to three times. House roofs should never exceed three layers of shingles. Adding additional layers without excavation can save homeowners up to $1,000 in labor.

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How much does it cost to add a layer of shingles to a roof?

Cost to Install Shingles

On average, you can expect to pay a contractor $3 to $6 per square foot to install your roofing. Prices can be higher if you choose a unique or complex shingle.

Can you roof over architectural shingles?

The quick answer is yes you can re-roof architectural shingles over existing architectural shingles (however you must check with the shingle manufacturer as well). Having said that it will be nearly impossible to get a good looking quality installation.

What is a roof overlay?

What is Roof Overlay? An overlay roof, or the process of overlaying a roof, occurs when a roofing technician puts another set of roofing materials directly on top of the existing roof. Roof overlay isn’t the most common method of roofing repair or replacement but it is one option.

Does flashing go over or under shingles?

Instead of installing the step flashing between shingles, the flashing rests on top of the shingles. It’s not unusual to see sealant installed when sidewall flashing is missing. Sealant will eventually dry, shrink and crack. You’ll see sealant substituted for flashing in a lot of different areas on roofs.

What is considered a new roof?

What Is a Roof Replacement? A roof replacement involves tearing off everything on the roof down to the deck, then putting on new felt paper and shingles. A roof replacement can be done no matter how many layers of shingles are already on the roof, so it can be done even when a reroofing is not an option.

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Roofs and roofing