Keep water leaving the roof
A roof covering only has to shed water. It does not have to be new, and it does not have to be perfect. It has to let water run off faster than it can find a way in, and almost everything that shortens a roof's life comes down to water sitting somewhere it should not.
Valleys are the first place to check. That is where two slopes meet and all the water from both sides funnels through one channel, and leaves and pine needles collect there faster than anywhere else on the roof. A blocked valley backs water up under the covering above it.
Gutters and downspouts are the second. If a gutter is holding standing water or overflowing during a normal rain, it is clogged, and water is finding another way off the roof edge — usually behind the fascia, not away from the house. Clear them on a schedule, not only after you notice a problem.
Almost everything that shortens a roof's life comes down to water sitting somewhere it should not.
Keep limbs off the roof
A branch resting on shingles or tile does three things over time, all of them bad. It holds moisture against the covering longer than the sun can dry it out. It rubs a groove into the surface every time the wind moves it. And it drops leaves and debris straight onto the roof instead of into a gutter.
Cut branches back far enough that nothing touches the roof even when wind pushes the canopy toward the house, not just on a calm day. This is a job for the ground or a ladder against the tree, not the roof. Do not walk the roof to reach a branch.
Overhanging canopy also feeds moss and algae growth by keeping a patch of roof shaded and damp longer than the rest. Cutting it back is as much a maintenance step as a safety one.
Check sealant and keep the roof able to breathe
Every pipe, vent, and stack that comes through the roof covering is sealed at the point it passes through, and that sealant is the part of the roof with the shortest working life. UV breaks it down faster than it breaks down the covering around it. Look at the sealant around plumbing vents, exhaust stacks, and any other penetration twice a year, and flag anything that looks cracked, shrunk, or lifted at an edge.
Soffit vents under the eaves and ridge vents at the peak are how the attic exchanges air. Paint buildup, wasp nests, stored boxes pushed against a soffit vent, or insulation blown over a ridge vent from inside all block that exchange. A blocked attic runs hotter and holds more moisture, and both of those work against the roof from underneath.
None of this is a job that needs a ladder onto the roof itself. Sealant at penetrations can usually be seen and reached from the eave line or through the attic, and vent blockages are usually visible from inside the attic or from the ground.
Watch the downspouts and the color of the roof
Asphalt shingles shed granules their whole life, and a few in the gutter after a hard rain is normal. A steady buildup of granules collecting at the base of a downspout, or bald patches visible on the shingles themselves, means the covering is wearing faster than it should. That is worth a call, not a project.
Dark streaking on a roof is usually algae, not dirt, and it does not mean the shingles underneath have failed. Treating it is a chemical job done at low pressure with the right product, applied by someone who knows how long to leave it and how to rinse it without driving water under the covering.
Do not pressure wash a shingle roof to clean it. A pressure washer strips the granules that protect the shingle from UV, and once those are gone that section of roof ages faster for the rest of its life. The streaking comes off; so does the protection underneath it.
After every named storm
A storm with a name is worth a look even if nothing is obviously wrong. Wind can lift and reseat a covering so it looks untouched from the ground while no longer sealed underneath, and that kind of damage only shows up the next time it rains hard.
Walk the inside of the house, not the roof. Check the attic for new staining, check ceilings for new spots, and look at the yard and gutters for granules, shingle pieces, or flashing that came off during the storm. That tells you almost everything you can learn without climbing up.
If you do find active water coming through wet decking, do not patch over it. A patch on top of wet plywood traps the moisture underneath it and the deck keeps deteriorating out of sight. Get the water stopped and the deck dried or addressed properly before anything goes back over it.
And stay off a hot shingle roof entirely, storm or no storm. Heat softens the shingle enough that foot traffic alone can scuff or dislodge granules, and that is true in the middle of a Florida afternoon on almost any day of the year.