Arizona’s monsoon season officially wraps up at the end of September, but the roofing problems it leaves behind don’t always show up right away. Wind, dust, and sudden downpours put real stress on a roof, and a lot of that stress is invisible from the ground until the first winter rain finds it. Fall is the window to catch it: the weather is mild, the storm damage is still fresh, and you have a few months before the wet season starts.
Why a roof that looked fine in September can leak in winter
Monsoon damage is often small at first. A tile that shifted half an inch, a seam that opened up, a vent boot that cracked after months of UV exposure. In the dry weeks after the storms, none of that causes a problem, so it goes unnoticed. Winter storms are different. They tend to bring slower, steadier rain that soaks a roof for hours instead of minutes, and that’s exactly the kind of rain that works its way through a small opening and into the decking or ceiling below. Checking your roof now means fixing a small problem on your schedule instead of a leak on the rain’s schedule.
Your fall roof checklist
What to look for depends on what’s on top of your house. Most homes in the Valley have tile, flat or foam sections, or some combination of the two, so start there.
Tile roofs
- Cracked, slipped, or broken tiles. Monsoon gusts can lift and shift tiles or crack them with flying debris. Even one displaced tile leaves the layer underneath exposed to sun and rain.
- The underlayment beneath the tile. Tile sheds most of the water, but the underlayment underneath does the real waterproofing, and years of Phoenix heat wear it down. If tiles have moved, that underlayment is now taking direct hits it wasn’t designed to take.
- Ridge and hip tiles. These sit at the highest, most wind-exposed points of the roof. Look for loose caps or cracked mortar along the ridgeline.
Flat and foam roofs
- Ponding water. If water is still sitting in low spots days after a storm, that’s a drainage problem worth fixing before winter rain makes it worse.
- Coating wear, cracks, and blisters. Foam roofs depend on their protective coating. Once the sun and storms wear through it, the foam underneath starts breaking down quickly.
- Punctures from debris. Branches and gravel kicked up by monsoon winds can puncture foam and built-up roofing, especially on patios, additions, and older ranch-style homes.
Shingle roofs
- Lifted or missing shingles. Outflow winds can peel back shingle edges, especially near ridges, hips, and the roof’s leading edges.
- Granule loss. Granules collecting in gutters or downspouts are a sign the shingle surface is wearing thin.
Every roof
- Flashing. The metal flashing around chimneys, vents, skylights, and roof-to-wall transitions can work loose from wind and heat cycling, creating a path for water to get underneath the roofing system.
- Drains, scuppers, and gutters. Monsoon dust storms leave behind a surprising amount of dirt and debris. Clear it out now so winter rain has somewhere to go.
Manufacturer-spec installation matters more than people think
A roof is only as good as its weakest connection point, which is why manufacturer-specified installation (correct fastening patterns, proper underlayment, and wind-rated materials) is such a big factor in how well a roof holds up through monsoon season. It’s also why installation quality is tied directly to warranty coverage: most manufacturer warranties, including the ones on GAF and IKO products, require the roof to have been installed to spec in the first place. A roof that was installed correctly the first time is a roof that’s far less likely to need storm-damage repairs at all.
Found storm damage? Document it first
If your inspection turns up damage that looks storm-related, take photos and note when you first noticed it, since most policies expect damage to be reported within a reasonable window. For a full walkthrough of documenting damage and filing a claim, see our Phoenix homeowner’s guide to monsoon roof damage and insurance claims.
Get a free inspection before winter
BlackHorse Roofing & Construction is licensed (ROC #342877), bonded, and insured throughout Arizona, and our crews are GAF, IKO, Carlisle, and Mule-Hide certified. We offer free roof inspections across the Phoenix Valley, including Scottsdale, Mesa, Chandler, Gilbert, Paradise Valley, and Fountain Hills. If your roof has been through this year’s monsoon season and you haven’t had it checked since, call us at 602-890-9512 and we’ll come take a look before the next storm does the finding for you.