What is the problem with more than two layers of shingles?

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.

Can you have 3 layers of shingles?

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. But that doesn't mean you won't still see roofs with three or four layers today.

How many layers of shingles is too many?

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.

Can you put another 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 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.

Two Layers of Shingles? Bad Idea!!

Is it safe to stack shingles on a roof?

Only Stack Shingles on Flat Surfaces Whenever Possible

If you drop the bundles with force, you may damage them or the roof, especially in cold weather. Also, breaking the bundles isn't recommended for laminate shingles because their two-layer construction resists bending.

What is a stack of shingles called?

Bundle: A package of shingles. There are typically 3, 4 or 5 bundles per square. Butt edge: The lower edge of the shingle tabs.

Is it OK to install shingles over 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 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.

Can u put shingles over shingles?

You might be able to lay new shingles over existing shingles and avoid the cost of tear-off. If conditions are right, new shingles laid over old shingles can be just as attractive and durable as shingles laid on bare sheathing.

How many times can you reshingle 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.

Can a roof be too heavy for House?

Changing to a heavier roof-covering material can cause compression cracking in drywall because the added weight can cause additional settling in the home's structural framing. This condition can actually be dangerous if the roof framing is not adequate to support the additional weight.

What layers should a roof have?

Are architectural shingles better than 3-tab?

Because of their durability and high-quality composition, architectural shingles generally have a longer lifespan than the 3-tab variety. They stand up better to weather conditions such as heat, snow, ice, rain, and strong winds. Their average lifespan is about 18 to 20 years.

How long do 30 year architectural shingles really last?

The truth is, a 30-year shingle will not really last 30 years. The expected service life of a 30-year product, if properly cared for, is approximately 25 years. If it's not cared for properly, that 30 year shingle will only last 12 to 15 years.

How long does a third roof layer last?

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 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.

Do you have to 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.

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 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.

Can I put new roof felt over old?

When felting over any old felt you can use a bitten primer to get a proper fix, some felts are also a 3 layer system allowing them to go over old felt, however if he has quoted for old felt to be removed then that is what he should have done.

How long does architectural shingles last?

When comparing the two shingles, you need to consider how long each one will last. 3-tab shingles have a manufacturer-specified lifespan of 25 years, while architectural shingles have a manufacturer-specified lifespan of 30 years.

What's a chimney cricket?

A roof cricket is a double triangle structure built behind a chimney to properly divert water around it. As water comes down your roof, it hits the cricket and splits down each side instead of hitting the flat wall of your chimney.

What is roof muck?

USES: Smooth MUCK® is a general purpose flashing cement for repairing and sealing leaks on asphalt roofs, concrete and metal roofs, shingles, gutters, downspouts, around chimneys, flues and skylights as well as for general purpose use in the maintenance of all exposed building and structures.