Is it OK to shingle over old shingles?

Installing a new roof over shingles takes less time than tearing off the old roof. Looks just as good and lasts as long. As long as it's done right and under the right conditions, installing new shingles over old ones can last as long and look just as good as a complete re-roof. Has the same manufacturer's warranty.

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.

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.

Can you install shingles on top of old 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.

Can you layer shingles on a roof?

No, you can't put three layers of asphalt shingles on a roof. In most states, you're only allowed to have two layers of asphalt shingles on a roof for fire safety reasons.

How to Reroof Over Existing Shingles - IKO Blueprint for Roofing Part 9

How many times can you put shingles 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.

How do you blend old shingles on new roof?

The easiest way to tie in the new shingles with the old is with a cut valley (see Four Ways to Shingle a Valley). After the addition roof is framed and sheathed, snap a line on the existing roof shingles 2 in. up from the valley center, and cut through the shingles and underlayment.

Can you roof over an old 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.

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.

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.

Can you put a second layer of shingles 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.

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.

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 will a 2nd layer of shingles last?

Shorter lifespan – As you might expect, new shingles laid over damaged shingles and rotting decking won't last as long as they could. To make matters worse, a roof with two layers of shingles holds in more heat, which speeds up deterioration. On average, an overlay lasts around 16 years.

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 often should you reroof a house?

Your asphalt roof is about 20 years old

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.

How many times can you recover a roof?

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.

How hard is it to match shingles?

In some cases, especially with an older roof, matching shingles can be close to impossible. An uneven patch job can decrease resale value and start a negative cycle of repair and replacement with a hodgepodge of shingles of different ages.

How long does a shingle roof last?

Homeowners with wood shake roofs should expect them to last about 30 years, while fiber cement shingles last about 25 years and asphalt shingle/composition roofs last about 20 years, the NAHB found.

Can you replace shingles in winter?

As it turns out, asphalt shingles can still be installed successfully in cold weather as long as roofers follow safety measures and apply changes to the usual roofing practices.

How much does a new layer of shingles cost?

A new asphalt shingles roof for a typical 2,000 to 2,200 square foot single-family house can range in price from $9,500 to $18,700 fully installed, including the tear off and disposal of the old roof (up to two layers).

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.

Can you put architectural shingles over 3 tab shingles?

If you've already got 3-tab shingles, you might be able to overlay with architectural ones while leaving them in place. This will cost less, as you won't have to tear off and start again.