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.

How do you add a second layer of shingles?





Make Repairs Before Reroofing



Remove shingles from any area where you notice deterioration or damage to the roof decking. Replace the damaged roof deck with 3/4-inch OSB board. Add a layer of shingles over the newly repaired area before you install your second layer of shingles.

What is the best product for roof decking?

The Best Materials for Roof Decking

  • Heavy Duty Rubber Roof Tiles. Rubber is one of the most durable materials out there, and rubber roof decking tiles are no different. …
  • Plastic Flow-Through Tiles. …
  • Faux Grass.


Do you need 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 do you install shingles over existing roof?





Quote from the video:
Quote from Youtube video: Begin with a starter strip remove the tabs plus enough from the top of the starter strip. So that the remaining portion is equal in width to the exposure of the old shingles. Apply the starter strip.

How long does a reroof last?

The life of a roof is how many years you get out of it. 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.

Can roll roofing be installed over shingles?

Q: Can I install roll roofing over shingles? Yes. The reason is simple: both roll roofing and shingles are a composition of the same asphalt material. Besides, roll roofing is easier to install on your roof.

Is 3 layers of shingles too much?

House roofs should never exceed three layers of shingles. Adding additional layers without excavation can save homeowners up to $1,000 in labor. Therefore, layering has advantages. Building and city codes require roofers to limit shingle layers to two.

How many times can you shingle over a roof?



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.

How much does a new layer of shingles cost?

A one-story roof with a single shingle layer costs between $100 and $150 per square to remove; a double layer, $115 to $165; and triple layer, $125 to $175.

What is the lifespan of an asphalt shingle roof?

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.

How often should roof Be Replaced?



In general, this is the recommended replacement schedule based on the material used: Composition Shingles: 12-20 years. Asphalt Shingles: 15-30 years. Wood Shingles: 20-25 years.

What is the labor cost to install a shingle roof?

Labor Cost to Shingle a Roof



Typical labor costs are around $1.00 to $1.50 a square foot on average for most roofs using asphalt or architectural shingles, making the labor costs for a 1,500-square-foot roof around $1,500 to $2,250 out of the $6,960 total.

Are 50-year shingles worth the money?

Even so, these could last you between 25 to 40 years at most until you’ll need a roof replacement. If your plan is to live in your home for the next 5 to 6 decades, 50-year shingles are worth the investment. If not, you might want to consider cheaper, alternative options.

What is the difference between 30 year and 50-year shingles?

A 30-year shingle is covered by the manufacturer for that time span, no matter the defect or issue that arises. A 50-year shingle, however, utilizes tougher materials during the manufacturing process.