Is it okay to put new roofing shingles over old ones?

The answer is yes, you can lay new roof shingles over old ones. … You can’t do it with wood or slate, 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 condition.

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.

Should you 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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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.

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.

Is it better to tear off old shingles?

Why Tear-Offs are Almost Always Necessary

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.

Will black shingles make house hotter?

Black and dark-colored roofs.

In general, dark-colored roofing materials will absorb the heat and cause your attic and/or the top of your house to be warmer than a lighter colored material.

Can you put plywood over old shingles?

The new plywood will have to be nailed to the rafters or roof trusses. … But, with the old plywood left in place, it will be considerably more difficult to locate the rafters to ensure proper nail placement.

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.

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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.

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.

How many layers of asphalt shingles are allowed?

Most building codes allow up to two layers of organic or fiberglass asphalt shingles. That limit pertains to roofs with up to a 4:12 pitch. When it’s time to replace your roof, there are several factors that might lead your roofing professional to recommend adding shingles on top of your existing layers.

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.

How much does it cost to rip off and replace shingles?

On average, it costs from $1.20-$4 per square foot to tear off and replace a roof with asphalt shingles. For a 1,700-2,100 square foot ranch-style property, that costs about $1,700-$8,400. However, roof replacement costs increase when you use higher-end roofing materials.

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How do you know it’s time for a new roof?

8 Potential Signs That Your Roof May Need To Be Replaced:

  1. Shingle edges are curled or shingle tabs are cupped.
  2. Bald spots where granules are missing.
  3. Cracked shingles.
  4. Your roof is at least 20 years old; while many shingles today are produced for durability, many factors can accelerate the aging of shingles.
Roofs and roofing