Asphalt Shingle Curling - Signs of Shingle Wear
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Asphalt roof shingle curling photographs & explanation
Curled shingle edges
Curled asphalt shingle corners
Diagnosing the causes of early asphalt shingle roof failure: curling, granule loss
Types & photographs of organic felt asphalt roof shingle defects & failures
Questions & answers about curling asphalt roof shingles: causes & cures

Curling asphalt shingle roofs: this article describes shingle curling as a sign of wear on asphalt shingle roofs and discusses how to identify & explain the most-common asphalt roof shingle failures. We illustrate different asphalt shingle curling patterns, types & causes, and we discuss how to decide if a curling-shingle roof can be repaired or if it needs replacement. We also illustrate early roof shingle failure on a 6-year old installation. Our page top photo shows shingle edge down-curling. Other photos on this page show shingle corner curling.

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Curling Asphalt Shingle Explanation & Photos

Curled, worn-out organic asphalt roof shingles

Also see our shingle curling photos and comparison with shingle fishmouthing shown at EARLY ROOF FAILURE DIAGNOSTIC QUESTIONS. These shingle curling defects occur on organic-mat or fiberglass-mat asphalt roof shingles. Readers are also invited contribute roof failure information to the web author for research purposes. web author for research purposes.

Curling roof shingles (as shown here) will show a curling-under at the edges of the shingle tab, first at the lower edge and sometimes also at the two sides of the shingle tab. The page top photograph of curled roof shingles shows a worn-out roof that needs replacement as soon as possible.

Making the distinction between "curled" roof shingles as shown on this page and "cupped" roof shingles as shown on the previous page may be a bit of a nuance of mostly academic interest since both conditions are signs of an older, worn roof.

But we have found that stepping on and breaking the edge of a curled roof shingle might cause less damage than that caused by walking on a cupped shingle roof where larger pieces of shingle break off under the feet of a thoughtless "roof inspector".

In fact we have seen a "failed" roof that was not leaking until the fellow who was asked to inspect it walked across this fragile surface.

From a ladder at the roof edge one could clearly see the virtual footprints of broken shingle edges where the "inspector" had walked. It's best to stay off fragile roof surfaces to avoid converting a "near end of life" condition to a "failed, leaking" condition.

Curling and cupping may occur together on the same roof, or shingles may appear to be curled-only (or fishmouth-curled-only as you'll read next). We don't see cupping without some curling.

Fishmouthed roof shingle fail(C) Daniel Friedman

As we advised about cupped roof shingles, when inspecting a a curled-shingle roof we would also be careful to stay off of it, particularly in cold weather since as with cupped or fish mouthed shingles they are more likely to break when stiff and cold.

And as we said earlier, if you have to walk on such a roof, move carefully, avoiding stepping on the raised or cupped shingle sections.

The badly curled, failing asphalt shingle roof shown at left was observed on a home in Arizona - certainly not a freezing climate, but nonetheless, walking on this roof will only cause further damage. These shingles are worn out and need replacement. [Click any InspectApedia image to see an enlarged version.]

It is rare that it's cost justified to repair a badly curled-shingle roof, but if it's absolutely necessary, perhaps as a stopgap measure while waiting for a whole new roof, when making curled shingle roof repairs, either work from adjacent surfaces which are in better condition, work your way down the roof from damaged areas back to the ladder, or prop a ladder up off of the roof surface and work from that scaffold as is sometimes done with slate or other fragile roof surface repairs.

Six Year Old Roof Shingle Curling & Granule Loss Diagnosis & Commentary

Question about early asphalt roof shingle failure:

I live in Wisconsin and had my roof replaced (total strip down) about 6 years ago. Now my shingles are curling up or fish mouthing. I do not know what you call it but it looks terrible . Can you help me out? A friend said to check on the internet for something with Owens Corning.

I believe they are 30 yr shingles. I do not have any of the paper work but when they put them on they said they only use premium shingles. Check out the rain gutter. It is 3/4 full of shingle fragments and granules. The rest of the roof shingles still look good. Any help would be great. - Louis Tolley, Adams WI

Answer and advice on diagnosing a failing fishmouthed shingle "new roof" job:

The roof shingle wear pattern in your photos is easily mistaken for "fishmouthing asphalt roof shingle" but what we see in your photos is not "fishmouthing" but rather shingle curling, combined with extreme granule loss.

Comparing Shingle Fishmouth Patterns with Shingle Curling Patterns

Fishmouthing asphalt shingles appear as an upwards curve in the center of shingle tabs, usually where the center of a fishmouthed shingle tab crosses over the shingle butt joints in the course below. See the fishmouth shingle photos above on this page.

Shingle tab curling, such as shown in your photos, occurs at the corners of shingle tabs, not in the center of the tab. See CURLING ASPHALT SHINGLES.

How old is This Roof Wear-Out?

Regardless, your roof photos show severe wear and curled shingle tabs that we see at the end of roof life - your photos of this worn roof slope show that every single shingle tab is curled up from a corner – that combined with the significant granule loss would be very unusual on a six-year-old roof. We comment further and provide some roof failure diagnostic questions just below.

From looking at the photographs, and recognizing that we are not looking at the entire roof, some comments and questions arise that should help sort out this "early roof failure" mystery:

The roof slopes in your photographs are totally worn out
This does not look like a six year old roof
Your comments suggest that other roof slopes are fine.
Before we assume that the wear difference is due to the building, roof ventilation, weather exposure, or a similar cause, let's consider that the roof is reported to be just six years old - actually we wonder if that's quite right.

Six-Year-Old Roof Shingle Failure Diagnostic Questions

Watch out: First off - don't fall off the roof while you are up there looking around.

Don't walk on these fragile, damaged asphalt shingles - they'll break and leak.

Go back to look at your information on your 6 year old re-roof job with the questions listed below. If you have no records and no documentation of who did the roof, what was the contracted scope of work (all slopes or just some) we can still figure this out by inspection of the whole building.

What type of shingles were installed in your re-roof job six years ago (your photos of failing shingles look like organic base not fiberglass base)
Are the same type of shingles present on all roof slopes?
Were all the roof slopes re-roofed or just some slopes? Sometimes only the worst or actively leaking roof slope is replaced, especially if the homeowner is squeezing for the lowest re-roof price, money is tight, or the roofer feels that there are five or more years remaining on other roof slopes
Did anyone actually inspect the roof before and after the job, other than the roofer?
Do all of your roof slopes look the same? That is, is the shingle wear the same on all slopes?
Are all roof slopes exposed to similar wind and weather conditions ? Usually not - which slope(s) show the most shingle wear?
Are you sure the roofer actually replaced shingles on all of the slopes?
Did you actually see that work being done?
If you remove or lift one of these bad shingles at the roof edge, do you see raw roof deck below or other old shingle layers?
Other asphalt shingle roof wear indicators and conditions (besides fishmouthing) are discussed beginning at ASPHALT ROOF SHINGLES.

Usually when we have inspected early roof failure cases like this it turns out that there was a misunderstanding (or less often, dishonesty) - the roofer did not re-shingle all slopes, maybe just one of them, but the owner thought they all were being done.

Frequently Asked Questions (FAQs) about curling asphalt roof shingles

Question: How do I know if the contractor screwed up or if I got defective shingles?

I have the same problem as the one in this article. When it rains there are tons of black granules and there are lots of curled shingles. I peeled the old shingles off before the contractor came in and replaced my shingles. My contractor told me that the new shingles were 30 year shingles. How do I know if the contractor screwed up or if I got defective shingles. The roof doesn't leak but I want to fix it before anything happens. What should I do next ? - alkelly85@yahoo.com 8/27/11

Reply: you should not see curled shingles on a new roof. Some granule loss on new shingles is normal, due to foot traffic during installation, but not any bald areas.

AlKelly

How old is your roof?

You shouldn't see shingle curling on a new roof - not at all.

You MIGHT see granules washing off on a new roof - they were loosened by foot traffic during installation. As long as it's a new roof and the granule loss is not ongoing, and there are no bald or damaged shingle surfaces, that part of your comment sounds normal to me.

I'd like to see some photos of the curling shingles - use the CONTACT link found on our pages.

Question: The real estate agent on this property said they had the roofer that did their house examine the issue in question and said the roof has "a good 5 more years of life

We are looking at a property in the Northwoods. On the southern sun exposed slope over the garage and shop, the shingles are curling badly. The real estate agent on this property said they had the roofer that did their house examine the issue in question and said the roof has "a good 5 more years of life" What potential effects could occur by leaving this issue unresolved in the next 5 years? Would it be prudent to insist the current owner "cure or fix up" the problem or allow some credit on the purchase price? - Ned Bandy, Wausau, Wisconsin 9/28/11

Reply: caveat emptor

Ned, it's a legal standard in real estate purchases that a buyer should obtain his/her own independent expert to assess the condition of property including assessing remaining roof life. Like the seller, a real estate agent has a conflict of interest and in court if you were arguing that you'd relied on the realtor, most likely the judge would say that in real estate where conflicting interests are well understood, caveat emptor.

I wouldn't ask a seller to fix anything - because of the risk of a wasteful shortcut that is ineffective. If the seller agrees to give you an allowance that's a solution that leaves you in the drivers' seat.

Question: Our new roof, two weeks old, is curling & warping - could cold weather installation be at fault?

Just got a new roof this year, (less than 2 weeks ago) and it is curling and warping? It is cold here right now and I understand it is better to put a roof on in warmer weather but could this be the culprit? I haven't received the final bill yet and don't want to pay up or accept any excuses without at least understanding if there may be some issue other than the install to blame. - Jules 1/25/12

Reply:

Jules, new shingles certainly should be flat, not curling; weather or temperature independent; Send me some photos if you can and I can comment further - use the contact link found on our pages.

Question: the shingles are curling on our 12-year old home

The [last 2] photos (left) look just like our issue. The home is only 12 years old and in the last two developed this problem. AWFUL!!! We have had an inspection and they are saying it is an organic shingle......a builders special!!

It's only on the south side of the house while the rest looks good. It was indicated that heat is likely the source for this both exterior and interior. We are getting estimates to replace and the numbers aren't pretty!! Can a shingle issue like this allow condensation to the attic area? - Bob 4/29/12

Reply:

Bob,

Curled roof shingles can be a symptom of wear and age, or of an indoor moisture problem that is not being adequately vented out (and of course high indoor moisture sources need to be identified and fixed).

A curled roof shingle, if damaged enough, might let water into an attic - that's a roof leak.

But the shingles do not cause attic condensation.

Curled shingles can suggest a product defect

What is unusual in our curling shingle photo above is that at first glance it looks like fishmouthing but I don't think so. Notice that every shingle corner is curled up - that's not how fishmouthed shingles show curling. (FISHMOUTHING ASPHALT SHINGLES) We haven't seen your roof, but for the one illustrated just above, that observation, combined with extensive granule loss on what was reported to be a 6-year-old roof suggests a product defect problem.

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  CRACKS in FIBERGLASS SHINGLES
  CUPPING ASPHALT SHINGLES
  CURLING ASPHALT SHINGLES

Mark Cramer Inspection Services Mark Cramer, Tampa Florida, Mr. Cramer is a past president of ASHI, the American Society of Home Inspectors and is a Florida home inspector and home inspection educator. (727) 595-4211 mark@BestTampaInspector.com
Hankey and Brown home inspectors, Eden Prairie, MN, technical review by Roger Hankey, prior chairman, Standards Committee, American Society of Home Inspectors - ASHI. 952 829-0044 - hankeyandbrown.com
Arlene Puentes, a licensed home inspector, educator, and building failures researcher in Kingston, NY
Asphalt Roofing Residential Manual,
Building Pathology, Deterioration, Diagnostics, and Intervention, Samuel Y. Harris, P.E., AIA, Esq., ISBN 0-471-33172-4, John Wiley & Sons, 2001 [General building science-DF] ISBN-10: 0471331724 ISBN-13: 978-0471331728
Building Pathology: Principles and Practice, David Watt, Wiley-Blackwell; 2 edition (March 7, 2008) ISBN-10: 1405161035 ISBN-13: 978-1405161039
Built-Up Roof Systems, Manual, C.W. Griffin, Mcgraw-Hill (Tx); 2nd edition (July 1982), ISBN-10: 0070247838, ISBN-13: 978-0070247833
Problems in Roofing Design, B. Harrison McCampbell, Butterworth Heineman, 1991 ISBN 0-7506-9162-X (available used)

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The Home Reference Book - the Encyclopedia of Homes, Carson Dunlop & Associates, Toronto, Ontario, 2010, $69.00 U.S., is available from Carson Dunlop. The Home Reference Book is a bound volume of more than 450 illustrated pages that assist home inspectors and home owners in the inspection and detection of problems on buildings. The text is intended as a reference guide to help building owners operate and maintain their home effectively. InspectAPedia.com ^® author/editor Daniel Friedman is a contributing author. Field inspection worksheets are included at the back of the volume.

Best Practices Guide to Residential Construction, by Steven Bliss. John Wiley & Sons, 2006. ISBN-10: 0471648361, ISBN-13: 978-0471648369, Hardcover: 320 pages, available from Amazon.com and also Wiley.com. See our book review of this publication.
Green Roof Plants: A Resource and Planting Guide, Edmund C. Snodgrass, Lucie L. Snodgrass, Timber Press, Incorporated, 2006, ISBN-10: 0881927872, ISBN-13: 978-0881927870. The text covers moisture needs, heat tolerance, hardiness, bloom color, foliage characteristics, and height of 350 species and cultivars.
Green Roof Construction and Maintenance, Kelley Luckett, McGraw-Hill Professional, 2009, ISBN-10: 007160880X, ISBN-13: 978-0071608800, quoting: Key questions to ask at each stage of the green building process Tested tips and techniques for successful structural design Construction methods for new and existing buildings Information on insulation, drainage, detailing, irrigation, and plant selection Details on optimal soil formulation Illustrations featuring various stages of construction Best practices for green roof maintenance A survey of environmental benefits, including evapo-transpiration, storm-water management, habitat restoration, and improvement of air quality Tips on the LEED design and certification process Considerations for assessing return on investment Color photographs of successfully installed green roofs Useful checklists, tables, and charts
Smart Guide: Roofing: Step-by-Step Projects, Creative Homeowner (Ed), 2004, ISBN-10: 1580111491, ISBN-13: 978-1580111492
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Curling Asphalt Shingle Explanation & Photos

Six Year Old Roof Shingle Curling & Granule Loss Diagnosis & Commentary

Question about early asphalt roof shingle failure:

Answer and advice on diagnosing a failing fishmouthed shingle "new roof" job:

Comparing Shingle Fishmouth Patterns with Shingle Curling Patterns

How old is This Roof Wear-Out?

Six-Year-Old Roof Shingle Failure Diagnostic Questions

Frequently Asked Questions (FAQs) about curling asphalt roof shingles

Question: How do I know if the contractor screwed up or if I got defective shingles?

Reply: you should not see curled shingles on a new roof. Some granule loss on new shingles is normal, due to foot traffic during installation, but not any bald areas.

Question: The real estate agent on this property said they had the roofer that did their house examine the issue in question and said the roof has "a good 5 more years of life

Reply: caveat emptor

Question: Our new roof, two weeks old, is curling & warping - could cold weather installation be at fault?

Reply:

Question: the shingles are curling on our 12-year old home

Reply:

Curled shingles can suggest a product defect

Questions & Answers regarding this article

Ask a Question or Search InspectAPedia

Technical Reviewers & References

Books & Articles on Building & Environmental Inspection, Testing, Diagnosis, & Repair