Shingle roofs

Cracked Shingles: What Causes Them and Should You Repair or Replace?

Cracked shingles usually come from heat, sun and age. A few thin surface cracks on a young roof are normal. Cracks that go through the shingle, spread across the roof, or sit with leaks and lost granules mean repair at best, and replacement if the roof is old.

By Josh Hildebrand, owner of Coastline Roofing · Florida license CCC1331076 · November 7, 2026

You spotted a crack and you want to know if it is a nuisance or a leak waiting to happen. Here is how to tell, and what a roofer would do.

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The basics

What do cracked shingles mean?

A few small surface cracks are normal aging. Cracks that go all the way through a shingle, or show up all over the roof, are a problem.

People use "cracked" and "split" for the same thing, but roofers do not. InterNACHI, a home inspector association, says a crack stays on the surface of the asphalt layer, while a split goes entirely through the shingle. A split can let water reach the roof deck (the wood under the shingles). A surface crack usually cannot.

TAMKO, a shingle maker, tells homeowners that minor surface cracks are a common sign of weathering and not cause for alarm, as long as they do not go through the shingle and the roof still sheds water. It also says deep cracks that reach the fiberglass mat in the middle of the shingle should be looked at, because they can let leaks start.

So the first question is not "do I have cracks?" It is "how deep are they, how many are there, and how old is the roof?" The rest of this page walks through each one.

Who this affects: anyone with an asphalt shingle roof, which is most homes in Manatee, Sarasota, Pinellas and Hillsborough counties. Who fixes it: a roofer, because the repair involves lifting the shingles around the damaged one. When it matters most: once the roof is past its first decade, and before hurricane season.

Not sure how bad your cracks are?

Coastline does roof repair and replacement on shingle roofs. An inspection with a written photo report shows each crack and whether a repair is enough. Coastline Roofing works all over Florida (license CCC1331076).

Call (941) 896-7793 or text your town and a photo.

Causes

Why do shingles crack in Florida?

Most cracking comes from heat, sun and age. A few causes start on the day the roof is installed.

Heat and sun

The Florida Division of Emergency Management says ultraviolet rays break down the asphalt that holds the granules on the top of a shingle, and heat bakes the shingle until it gets brittle and loses strength. TAMKO adds that the sun can raise rooftop temperatures 50 to 70 degrees above the air temperature.

Expansion and contraction

Asphalt shingles swell when hot and shrink when cool. InterNACHI calls splitting from this movement thermal splitting. It tends to show up where a shingle bridges a joint in the layer under it, and splits can form a stair-step pattern across the roof.

Age and a weak seal

IBHS, a home safety research group, reports that the sealant strip on a shingle weakens over time. After about 7 to 10 years it is weak enough to cut the shingle's wind resistance a lot. A loose tab flaps in the wind, and a flapping tab can crease and crack.

Nails and the roof deck

InterNACHI explains that the wood deck and the shingles move at different rates, and the nails pass that movement into the shingle. Nails that were set badly, or a deck that moves a lot, can make the cracking worse.

Wind creasing

When wind bends a tab farther than it can flex, it leaves a crease. InterNACHI counts a crease as a crack unless it runs all the way through. A creased tab often means the seal under it has already failed.

Product and roof age

InterNACHI notes that splitting is more common in fiberglass shingles. Any shingle that has baked for 15 or 20 Florida summers will crack more than a new one, no matter who made it.

What to look for

How can I tell a minor crack from a serious one?

Look at the depth, the spread, the granules and the seal. Two or more of these together point past a simple repair.

You can learn a lot from the ground with binoculars. Please do not climb up to check. Aged shingles get brittle, and the Florida Division of Emergency Management warns that old shingle tabs may break off when people handle them. A roof is also slick and hot.

Depth. A thin line that stays in the surface is the mild kind. A dark gap you can see through, or a piece of the tab hanging, is a split.
Spread. A few shingles in one spot, such as a spot facing the afternoon sun, is one story. Cracks scattered across every slope is another.
Granules. TAMKO says some granule loss is normal, and granules in gutters after a new install are not a worry. It says heavy loss that shows the asphalt underneath needs prompt attention. Our page on granules in gutters goes deeper.
Seals. If several tabs have lost their seal and lift on their own, the roof is losing wind protection even where nothing is cracked yet.
Other wear. Cracks that sit next to curling and cupping, blistering or nail pops tell you the whole roof is aging, not one bad shingle.

Inside the house, a brown ring on the ceiling or a damp spot in the attic after rain means water is already getting through. See what to do when your roof is leaking.

The decision

Should I repair or replace a roof with cracked shingles?

Repair when the damage is limited and the rest of the roof is sound. Replace when cracking is widespread on an older roof.

The roof's age and the spread of the damage decide this, not the crack itself. TAMKO says deep cracks should be investigated. InterNACHI's inspection guidance says that when many shingles show drying, granule loss and cracking, the roof likely needs replacing. The Florida Division of Emergency Management is blunt too: if shingles are old and worn, patching or limited repairs will not help when a hurricane strikes.

How cracked shingles are usually handled
What you see	Usually means	Usual next step
A few surface cracks, roof under about 10 years old	Normal weathering	Watch it. Look again after each storm season.
A few split or creased shingles in one area, rest of roof sound	Local damage from wind, heat or a bad nail	Repair. A roofer replaces those shingles and reseals nearby tabs.
Splits across many shingles, roof near the end of its life	Aging throughout the roof	Plan a replacement. Repairs will keep chasing new cracks.
Cracks on a roof only a few years old	Possible product or installation problem	Photograph it and ask a roofer to identify the shingle. The maker's warranty papers say what is covered.
Cracks plus a leak or soft spots in the deck	Water has already reached the wood	Fix the leak first, then judge the roof. See roof deck damage.

Florida also has a rule that can affect how much repair work an older roof can take before the building code asks more of the roof as a whole. Our page on the 25 percent rule explains it. For money, start with the roof repair cost guide and the shingle roof cost guide, then compare.

If you are close to a decision, the signs you need a new roof and how long roofs last in Florida help you place your roof on the timeline.

The fix

How are cracked shingles repaired?

A roofer takes out the damaged shingles, puts in new ones, and checks that the tabs around them are sealed and nailed.

A good repair is more than gluing a crack. A roofer lifts the tabs above the damaged shingle, replaces it, and makes sure the nails sit where the maker's instructions say. The Florida Division of Emergency Management notes that roofing cement under a loose tab can buy time on a flexible shingle, but it treats that as a short-term step that mostly helps looks. It does not make an old shingle new.

Two things make a repair last. First, the roofer should check the shingles around the damage, because a crack often means the seal beside it has failed. Second, the repair should be written up. Coastline does inspections with a written photo report, so you can see each crack, where it is, and what the roofer recommends. Josh reviews every job.

If the roof has more than a handful of splits, ask for the report before you spend money on repairs. It is cheaper to learn the roof is near its end before you patch it three times. For other repair topics, see our roof repair page.

Florida

Why are cracked shingles a bigger deal in Florida?

Heat ages shingles faster here, and hurricane winds go after any tab that is loose or cracked.

The Florida Division of Emergency Management says the hot, sunny Florida climate conspires to shorten a shingle roof's life. IBHS reports that the sun can push a roof surface above 200 degrees, and daily temperature swings can reach 80 to 90 degrees. Those swings are what fatigue the shingle.

Wind is the second part. The state's shingle guidance says wind resistance depends on keeping tabs stuck to the shingle below, and that roofs more than about 10 years old fail more often in gusts of 75 to 95 mph. It cites studies in which, at gusts above about 120 mph, 3 to 5 out of 10 shingle roofs were damaged enough to need re-roofing. A cracked, unsealed tab is the first thing a storm tears loose.

The best time to look is before June. After a storm, missing shingles and hidden storm damage are the next things to check. A roof inspection gives you a dated record of what the roof looked like.

Reviews

What homeowners say about working with Coastline

★★★★★

"Josh was very thorough diagnosing a hard-to-find leak on a tile roof, after 2 other roofing companies tried but failed to catch the problem. ... Great work at a fair price, great service."

Mark R.Leak repair, tile roof

★★★★★

"Loved how Josh used his drone to identify cracked and slipped roof tiles and sent us the photos. Photos also taken of completed work."

Felicity K.Tile roof inspection

★★★★★

"They did a good job on the repair so I would definitely recommend them."

Duke H.Roof repair, Florida Gulf Coast

FAQ

Sources

Want a straight answer on your cracked shingles?

Josh will inspect the roof and send you a written photo report that shows what is cracked, what is not, and whether a repair or a replacement fits your roof.

Call (941) 896-7793 Text (941) 345-0072

Cracked Shingles: What Causes Them and Should You Repair or Replace?

What do cracked shingles mean?

Not sure how bad your cracks are?

Heat and sun

Expansion and contraction

Age and a weak seal

Nails and the roof deck

Wind creasing

Product and roof age

How can I tell a minor crack from a serious one?

Should I repair or replace a roof with cracked shingles?

How are cracked shingles repaired?

Why are cracked shingles a bigger deal in Florida?

Roof Repair

Shingle Cupping and Curling

Signs You Need a New Roof

Sources

Want a straight answer on your cracked shingles?