Is it OK to have 2 layers of shingles?

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 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.

Can you shingle over one layer of shingles?

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 many layers of asphalt shingles are allowed?

Most building codes allow two layers of organic or fiberglass asphalt shingles on roofs with a 4/12 pitch or less, and three layers on steeper roofs. If the structure can support the added weight, a typical 20-square (2,000-square-foot) reroof will cost at least $1,000 less than a tear-off job.

Is it OK to put new shingles over old?

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.

Two Layers of Shingles? Bad Idea!!

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.

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.

Should I replace my new roof with step flashing?

Typically, we will replace step flashing when doing a new roof. Also, a new flashing should not be layered over the old flashing. Your roof is supposed to have only one layer of flashing at a time. Installing new flashing is the only way that we can guarantee quality outcomes when replacing your shingle roof.

How do you stack shingles on a roof?

How often should roofs be replaced?

Knowing when a roof was installed (and what it's made of) offers insight into how much life it has left. For instance, a typical asphalt shingle roof lasts 20 to 25 years, while a roof installed over an existing layer of shingles should be replaced after 20 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.

When should you reroof?

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 many times can you reroof a roof?

As mentioned above, homeowners are legally limited to two layer of roof shingles. Therefore, if you already have two layers, you'll need a full tear-off. Additionally, if your roof is severely damaged, it likely won't be able to support the weight of a reroof and will need to be torn off.

How much does it cost to roof a house?

The national average cost to replace a roof is around $8,000, with most people spending in the range of $5,500 to $11,000. The two largest variables you'll deal with on a job like this are the square footage of your home (and thus, your roof), and the type of roofing material you choose.

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.

How many layers is a typical roof?

A normal roof has a starter row of shingles and then a single layer above it, giving it a total of two shingle layers. Roof-overs, on the other hand, will have four layers.

How many layers can go 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.

Can you have two layers of shingles in Florida?

There are two layers of material in this roofing system. Under the Florida Building Code, this is acceptable, but it is the maximum number of layers allowed.

What type of roofing is best?

Asphalt Roofing Shingles

Relatively lightweight, inexpensive, and easy to install, asphalt shingles are the best choice for most houses. They come in sheets that are layered on a roof to give the illusion of more expensive single shingles, such as cedar and slate, that are installed one shingle at a time.

What should I look for after replacing a roof?

Your inspector will look for signs of sagging, which is a definite point of concern in a new roof installation. Beyond that, there is also the fascia and soffits to inspect which, while not as substantial as the main structure of the roof itself, can still cause significant damage if not installed correctly.

When should I remove moss from my roof?

If your roof has sprouted a moss infection, you can remove it before it becomes serious enough to impact the performance of your roof. Moss is tough and typically you will not be able to remove it by hand. However, you can use a chemical solution to loosen the moss without damaging the shingles.

How many times can you stack shingles?

Don't Stack Too High

Another reason to avoid stacking too many is to not risk them toppling over and becoming damaged. If you are using asphalt composite shingles, 9 stacked bundles is probably the limit.