Are roof shingles supposed to lay flat?

Often, shingles will conform to the shape of whatever is underneath them, and if the surface isn't completely flat, this could lead to bumps and dips in the shingles. Fortunately, most shingles will correct themselves with warmth and time.
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Is it normal for new roof shingles to not lay flat?

New roof shingles not laying flat? Don't panic. While bumpy shingles might look like a big problem, they are actually a common occurrence.
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Why do my new shingles look wavy?

New shingles are not aligned accurately.

A bad measurement, improperly sized shingle, or low quality roof can simply result in an uneven and wavy appearance, which essentially means you got a raw deal. This is why working with trusted professionals is so important, and why the lowest quote doesn't always mean the best!
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How flat is too flat for shingles?

Any slope that has a pitch less than 2/12 is too flat for shingles and should be covered with flat roof materials such as TPO, PVC, EPDM rubber, or others. Besides shingles, there are other roofing materials that should not be used on flat roofs.
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Can a roof be too flat for shingles?

It's true that flat roofs aren't exactly flat, they have a small pitch of a few degrees. Still, you cannot put shingles on a flat roof as water does not drain off them quickly enough. The absolute minimum slope for asphalt shingle installation is 2:12.
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Installing rectangular roof shingles



What is the minimum slope for asphalt shingles?

The minimum roof pitch for shingles is a 2:12 pitch.

If your roof is less than 2 vertical units (inches or feet) up for every 12 horizontal units out, it's considered low slope.
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What is the minimum slope for normal application of asphalt shingles?

What is the Minimum Slope for an Asphalt Shingle Roof. The short, simple answer is 2:12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. Asphalt shingles continue to be the most widely installed roof covering option in North America.
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What is considered a flat roof?

A roof that is nearly flat or slightly pitched is called a flat roof or low slope roof – No roof should be dead flat because it must have at least a slight slope to drain. Low-slope & steep-slope terms describe roof slope, the slant of a roof. A low-slope roof is one that has a slope of less than 3-in-12.
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What is the minimum roof slope?

The smallest pitch of a roof is 1/4:12, which translates to 1/4 inch rise to 12 inches of run. Such a small pitch can only work with built-up roofing or specialized synthetic roofing. Covered porches that are near trees or in areas with heavy rains should not be covered with a low-slope roof.
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What is the minimum slope of a flat roof?

A flat roof is generally any roof with a pitch of 1-10 degrees. That means flat roofs aren't actually flat. It may look horizontal but often has a minimum slope of 1/4 inch per foot. This allows water to run off the roof to prevent damage.
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How long does it take for roof shingles to settle?

The first, and more flexible, is that the outside temperature on the roof must be at least 40 degrees F for 24 consistent hours. The reason for this is that the adhesive strip will not activate and seal the shingle under colder conditions.
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How should roof shingles look?

Shingles will normally look a little lumpy when first installed, but within a couple of warm days, they should lay flat. It is not normal for new shingles to look wavy for more than a few days and if this is the case for your roof, contact your contractor to discuss it.
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Why is there a dip in my roof?

A leaky roof might cause the sheathing to rot and collapse, partially making the area to dip. In most cases, a roof dip due to a leak occurs near the dormer or the chimney. It is easy to identify collapsed sheathings from below. They tend to be dark and discolored and with mold growth.
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Are shingles supposed to lift up?

Loose or Lifting Shingles

When you look at your roof, all the shingles should be smooth and flat in order to keep moisture out of your home. One surefire sign that your roof has some damage is loose or lifting shingles.
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Why do roof shingles curl up?

Both curling and buckling are most often caused by moisture of your roof decking or underlayment. Buckling shingles appear as if they are being pushed upward from beneath. It can be the result of a lack of insulation or poor attic ventilation, as well as improper installation.
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How do you fix raised shingles?

  1. Slip a flat pry bar under the damaged shingle and press down to pop out the roofing nails.
  2. Slide the new shingle up into place. Be sure to align with the shingles of either side.
  3. Carefully lift the upper shingle and secure the new shingle with roofing nails.
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Can roofs be flat?

Homeowners can choose among three kinds of flat roofs, says Bruce O'Neal, vice president of Matthews Roofing, which has been keeping Chicago's many flat roofs dry since 1934. What are the different types of flat roofs? Built-up roof (BUR), modified bitumen roof (MBR), and rubber membrane roof (EPDM).
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Why are some roofs flat?

Commercial Roofs are flat roofs because they are much more cost-effective compared to pitched roofs. It's easier to put a sloped roof on a small residential home, but to do the same on a very large commercial building would be impractical, dangerous and difficult.
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Which is better flat roof or pitched roof?

The longevity of a pitched roof is usually superior to that of a flat roof, leading many homeowners to choose it for their properties. The materials used are generally more weather resistant and durable, though with more robust materials being introduced into the flat roofing market, this gap is starting to close.
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Why do people have flat roofs on houses?

A flat roof has more square footage for accommodating equipment, such as exhausts and air conditioning vents. Additionally, as the surface is level, it's able to provide stability for heavy items, even while they're in operation. Durability and longevity are other reasons why many people choose this type of roofing.
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What shingles are best for a low slope roof?

The slope or pitch of a roof dictates the type of shingles you should install. For a low-slope roof such as 4:12 to 2:12, three-tap shingles are preferable. Low-slope roofs are more susceptible to ice and water problems such as ice dams, so better flow properties are important to consider for installation.
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Is roof sagging normal?

Sagging is a common roofing problem that appears in homes with roofs that haven't been replaced in a long time due to a deteriorated structure. They are also a common problem in older homes due to the way roofs used to be designed. In terms of how much roof sag is acceptable, just about any sagging is bad.
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Should a new roof have soft spots?

A soft spot on your roof doesn't necessarily mean you need a full roof replacement. It is important to note though that most of the time, if you have identified one soft spot, there are chances that there will be more soft spots.
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How do you know if your roof is sagging?

What Does A Sagging roof look like? It's easy to spot sagging roof. You will see a dip on the flat part of your roof, a bow in the roofline, or humps and waviness on the roof plane. If the problem is related to the foundation, you will also begin to see cracks on the exterior walls and uneven support beams.
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What time of year is best to replace a roof?

Fall is considered the best season to replace your roof!

Changing seasons can largely impact many factors of your roof replacement – rain, snow, heat, humidity. These weather conditions could also affect how quickly your job can be completed.
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