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By the end of September a Broward County roof has been through roughly five months of near-daily moisture. The rainy season does not damage a roof all at once; it works slowly, and the results usually become obvious right about now.
This is a practical checklist you can work through from the ground, plus the things worth handing to somebody with a ladder and the right equipment.
1. Look for Streaking From the Street
Stand across the road and look at each roof plane in turn. Dark vertical streaks are algae, specifically Gloeocapsa magma, which feeds on the limestone filler in asphalt shingles and thrives in exactly the humidity we have just come through.
If the streaks are visible from the street, the colony is established. It will not fade over the dry season; it will simply pause and resume next May from a larger footprint.
2. Check the Shaded Planes First
North-facing planes and anything under tree canopy dry slowest and stain first. Comparing a shaded plane against a sunny one on the same roof tells you how fast growth is moving on your particular property.
Where limbs actually overhang the roofline, that is a trimming job before it is a cleaning job. Sunlight and airflow are what keep a roof surface hostile to organic growth, and no amount of cleaning outruns a canopy sitting directly on top of it.
3. Look for Lichen and Moss, Not Just Streaks
Streaking is the early stage. Raised green or grey-green patches that look almost crusty are lichen, and clumped growth in the valleys is moss. Both hold moisture against the roofing material rather than sitting on it, and both are considerably more destructive than flat algae staining.
Finding either means the roof has moved past cosmetic and into maintenance territory.
4. Clear the Valleys and Low Points
Leaf litter, seed pods and blown debris collect in roof valleys through storm season. Wet debris sitting in a valley keeps that section permanently damp and is where rot problems usually start on a roof that is otherwise fine.
5. Follow the Water All the Way Down
A roof does not end at the gutter. Everything that washes off it – granules, dead algae, leaf litter – ends up in the gutters, then the downspouts, then whatever drainage those feed.
Check that water actually leaves the property rather than pooling at the base of a downspout. A line that is already sluggish going into the dry season is a line that backs up during the first heavy rain in May, and that is the same failure mode drain and sewer specialists clear at ground level year round. It is a much cheaper problem to find in October than to discover in a storm.
6. Check the Penetrations
Vent stacks, pipe boots, skylights and any point where something comes up through the roof are where flat and low-slope roofs almost always start leaking. The flashing and sealant around a penetration weathers faster than the field of the roof because it moves differently.
If a plumbing vent boot looks cracked or the collar has pulled away, that is worth resolving before the dry season ends. It is routine work for a plumbing contractor – plumbers in Davis County, Utah handle the same detail on the same kind of stack – and it is far easier to deal with while the roof is dry.
7. Note What Storm Season Moved
Walk the perimeter and look for granules collecting at the bottom of downspouts, displaced tiles, or anything on the ground that used to be on the roof. Loose hardware around the property tends to move in the same weather, so it is worth checking that gates, sheds and outdoor storage still latch and lock properly – seized exterior hardware after a wet season is common enough that a locksmith in Dallas, Texas sees the identical complaint in a completely different climate.
8. Decide Whether This Is a Cleaning Year
In South Florida we generally suggest professional roof cleaning every two to three years. Shade, roofing material and surroundings shift that. If you are seeing defined streaks, lichen or moss, this is the year.
One thing not to do: pressure wash it yourself. High pressure strips granules off shingles, cracks tile and drives water under the roofing. The correct method is soft washing – a biodegradable solution applied at low pressure that kills the growth at the root, followed by a gentle rinse. It works because the organism dies rather than simply being knocked off.
Autumn Is the Right Window
Cleaning now means the roof goes into the dry season clean, and the algae has to start over from nothing when the rain returns. Waiting until spring gives it another six months of ground.
Read more about roof cleaning in Broward County or the rest of our pressure cleaning services. When you are ready for a look at yours, contact Super Kleen Pressure Cleaning for a free, no-obligation estimate.
