Can you put new shingles over 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 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 shingles on top of shingles?

The Basic Rules

Know this: placing old shingles over top of the new ones is only possible with asphalt shingles, which are also known as composition shingles. You cannot place a new layer over top of slate or wood, and you should definitely never mix materials like laying asphalt shingles over cedar shakes.

How many layers of shingles can you put on a roof?

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.

Should you 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.

Can I Install New Shingles Over an Existing Roof? [Northern Virginia Roofing Tips]

How do you add a second layer of shingles?

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.

How long does a roof overlay last?

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 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.

Is re roofing a good idea?

If you are a homeowner with minor issues or leaks, which typically occur as the roof reaches the end of its lifespan, but the roof is in overall good shape, re-roofing may be for you. If you only have one layer of asphalt shingles on your roof, you may also be a good candidate for re-roofing.

Is it OK to roof over an existing roof?

Installing a new roof over an existing one can only be done if you have shingles because you can only put shingles over shingles. It is not possible to mix materials, nor to install a new layer over slate or wood tiles.

Why are multiple layers of shingles bad?

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.

What is the best month to replace a roof?

Fall (September, October, November)

The transition to cooler temperatures produces a prime time for roof replacements. Fall is considered the best time to replace your roof and here's why: Comfortable temperatures (for the crew and shingles!)

How much does it cost to replace a roof on a 2500 square foot house?

When it comes to asphalt shingles (one of the more basic and affordable roofing options), figures generally range from $3.50-$5.50 per square foot installed. A new asphalt roof for a typical 2,500 square foot single-story ranch house can range in price from $9,000-$20,000 installed.

How long does it take to roof a 1500 sq ft house?

In extreme cases, it could take three to five days. Depending on the weather, complexity, and accessibility of your home it could even take up to three weeks. But unless it's a large home, a roof can typically be replaced in a day.

Is a roof overlay worth it?

In the long run, an overlay roof is likely to cost more than a complete tear-off and re-roof installation project. That said, an overlay roof will save you money upfront, and can be done more quickly if you're on a time crunch.

Is it cheaper to shingle over an existing roof?

Let's start with the good. Many Arizona homeowners with shingle roofs do decide to roof over their existing shingles because: Less expensive. You can save money because there's no dump fee for removing your old roofing, and there's no need for additional felt paper over the old roof.

How much does it cost to add a layer of 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. The contractor will have to dispose of shingles, which costs an extra $25 to $150.

How long will a new 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.

Is it cheaper to get a roof in the winter?

Roof replacement during the winter is the best time.

Of course, new shingles need to undergo thermal sealing, which can take several days and even weeks in temperatures of 40 degrees Fahrenheit or higher. Another positive point is that roofing material prices will be cheaper in the winter months.

Is it OK to put a new roof on in the winter?

It's completely possible for a successful roof replacement to take place during the winter months. In fact, when a significant leak or roof damage is discovered during the winter, we recommend replacing your roof as soon as possible in order to minimize the risk of further damage.

Why do roofs cost so much?

Tile and Asphalt are the most used materials for roofing, and they're manufactured with the usage of concrete, clay or oil. The rise of oil prices can directly impacted asphalt shingles to become more costly. Furthermore, the cost of disposing old and damaged materials has also increased in the recent years.

What is the difference between re roof and new roof?

Roof Recover: The process of installing an additional roof covering over a prepared existing roof covering without removing the existing roof covering. Roof Replacement: The process of removing the existing roof covering, repairing any damaged substrate and installing a new roof covering.

How much does it cost to replace a roof on a 3000 square foot house?

The average cost to replace a 3000 square foot roof is around $6,000- $18,000. This price includes materials and labor. If you have to hire contractors to remove the old roof, then this will add another cost of about $4200 on top of the total.