What Does Asphalt Shingle Roof Cleaning Do for a Lafayette Roof?
Asphalt shingle roof cleaning is a low-pressure soft wash that lifts black streaks, moss, lichen and mold from a shingle roof in Lafayette without stripping the granules that protect it. The wash uses a cleaning solution and a gentle rinse, never high pressure, because high pressure pulls granules off and granule loss is permanent. This guide explains how shingles age here, what growth does to them, how a soft wash works, and when to call a roofer instead.
Lafayette Roof Cleaning, 2014 W Pinhook Rd, Lafayette, LA 70508. Fully licensed and insured in Louisiana. Free estimates returned within 2 hours.
What Does Asphalt Shingle Roof Cleaning Do for a Lafayette Roof?
Asphalt shingle roof cleaning is a low-pressure soft wash that lifts black streaks, moss, lichen and mold from a shingle roof in Lafayette without stripping the granules that protect it. The wash uses a cleaning solution and a gentle rinse, never high pressure, because high pressure pulls granules off and granule loss is permanent. This guide explains how shingles age here, what growth does to them, how a soft wash works, and when to call a roofer instead.
ASPHALT SHINGLES
Why are asphalt shingles the most common roof in Lafayette?
Asphalt shingles are the most common roof type in Lafayette and across Acadiana. A shingle is a mat coated in asphalt and covered in mineral granules, and those granules are the roof’s shield against the sun. They block ultraviolet light and slow the wear of the asphalt underneath, so as long as the granules stay in place, the roof does its job. Once granules are gone from a spot, that spot wears fast, and no wash can put them back.
Lafayette’s climate is what makes shingle roofs here a cleaning question. The air stays humid for much of the year, with about 62 inches of rain a year, and shade keeps roofs damp longest. North-facing slopes and roofs under live oaks are hit first, because they dry slowest after rain. Damp shade is where algae, moss, lichen and mold grow, so a shingle roof in Lafayette picks up growth sooner than the same roof would in a dry climate. That is why the question for most homeowners is not whether the roof will grow streaks, but when, and what to do about them.
BLACK STREAKS
What do black streaks on an asphalt shingle roof mean?
Black streaks are algae, a blue-green growth called Gloeocapsa magma that feeds on the limestone filler in asphalt shingles. It spreads by airborne spores, so it arrives on its own, and it shows first on north-facing and shaded slopes because those stay damp longest. In warm, humid Louisiana it is common on shingle roofs of every age.
The honest framing matters here. CASMA, the authority already cited on this site, says algae staining is cosmetic and has not been shown to shorten shingle life. Contractor sources add that the algae mat holds moisture against the shingle, which can speed granule loss over time, and that dark staining absorbs heat. This page follows the CASMA framing: streaks are a surface problem that makes a roof look old and worn, and cleaning restores how the roof looks. It does not claim cleaning adds years to a roof’s life, and any question about how long a roof will last is a roofer’s question, not a cleaning one. For the full detail on streaks, see the guide on black streaks on roofs.
How does moss damage asphalt shingles?
Moss is a living mat that sets root-like structures into shingle joints, and it is worse in shade and under tree cover. As the mat thickens it lifts shingle courses, and a lifted shingle opens a path for wind-driven rain and for water to creep under the shingle to the underlayment and the decking. Moss holds many times its weight in water, so a mossy roof stays damp for months, which rots decking and corrodes fasteners. It also strips the oils that hold granules in place, so granules erode and the shingle loses its ultraviolet protection. Moss clumps break off and clog gutters, which is often how a homeowner first notices the problem.
The most common way a roof is damaged during cleaning is also moss-related. Pulling, scraping or pressure washing moss strips granules off with it, and granule loss is permanent. Treatment is a chemical kill followed by a low-pressure rinse, never scraping or blasting, so the moss dies and releases without taking the shingle surface with it. For the full detail on moss, see the guide on roof moss.
Why is high pressure the wrong tool for shingle roofs?
High pressure is the wrong tool because it does to shingles exactly what the growth does, only faster. A pressure washer strips granules off the shingle surface, and once granules are gone the asphalt underneath is exposed to the sun and wears quickly. The manufacturers’ association, ARMA, is clear on this: never use a power washer, a brush or a broom on asphalt shingles. The recommended method is low-pressure chemical cleaning, which is what a soft wash is.
Granules are the roof’s shield against the sun. Once they are stripped away, no wash can put them back.
Pressure damage also risks warranty coverage, because shingle warranties are written around the roof being cared for in the way the maker specifies, and blasting a roof with high pressure is not that way. A soft wash follows the ARMA-recommended method instead: a cleaning solution does the work, and a gentle rinse carries the dead growth away. That is the whole point of soft washing a shingle roof. It cleans without taking the roof apart.
What does a soft wash do on an asphalt shingle roof?
A soft wash on a shingle roof starts with an evaluation, not with water. The roof is checked to see whether the marks are surface stains or signs of real roof damage, because a wash cleans what is on the surface and anything broken underneath still needs a tradesperson. Then a cleaning solution is applied and given time to work on the growth, and a low-pressure rinse carries it away. Siding, gutters and soffits are cleaned with the roofline so regrowth has nowhere to hide, and every job comes with dated before-and-after photo reports that show what the roof looked like before the wash and what it looks like after.
Lichen needs a special note here, because it is the most stubborn of the growths. Lichen is a combination of algae and fungus that physically bonds to the shingle surface, and it anchors with tiny root-like systems that grip the shingle. It takes a chemical treatment and time to detach fully, so it does not all come off on the day of the wash, and no honest cleaner promises instant removal. Mold and mildew are treated with a soft wash with biocide, and the gutters and soffits are cleaned at the same time so damp has nowhere to settle. For the full detail, see the guides on roof lichen and roof mold and mildew.
How do you know if a shingle roof needs cleaning or a roofer?
Most of what a homeowner sees on a shingle roof is a cleaning question. Some of it is a roofer question, and the difference is what the roof is doing, not just what it looks like. The table below is the quick way to tell.
Granule loss deserves its own line, because it is the one thing cleaning cannot fix. Granules in the gutters are a symptom of aging or past damage, and a wash cannot restore granules that are already gone. If the gutters are full of them, that is a roofer conversation about the roof’s condition, and cleaning the roof will not change the answer. The same holds for rust stains: the fix is replacing the corroded metal, then cleaning the stain that is left behind. For the full clean-or-replace picture, see roof cleaning vs roof replacement.
How often should asphalt shingle roof cleaning be done in Lafayette?
Research gives a wide range for how often a roof needs cleaning, typically 1 to 5 years depending on shade, trees and humidity, with shaded properties regrowing fastest of all. In Lafayette that range is the honest answer: a roof under live oaks on a north-facing slope will streak again far sooner than a roof in full sun with open sky above it. The practical rule is to clean when the streaks show, not on a fixed date, and to book before listing photos are taken or before an insurer or an adjuster asks for photos.
Timing through the year follows the weather. A wash in spring gets the roof clean before hurricane season, which runs June 1 to November 30, and a check after heavy weather catches storm debris and growth that the rain fed. Summer brings afternoon thunderstorms nearly every day from June to August, and that steady damp is what feeds regrowth. Autumn is usually the driest part of the year, which makes it a good window for a wash and for clearing gutters before leaf fall. Winter here is mild, with essentially no snow, so the service runs year-round and there is no season when a roof cannot be cleaned.
What does Lafayette Roof Cleaning check before washing a shingle roof?
Before any wash, the roof gets a stain evaluation. Black streaks, moss and mold are checked to see whether a soft wash will lift them, because the first step is knowing whether the marks are surface stains or signs of real roof damage. Gutters and valleys are checked too, since granules in the gutters and debris in the valleys say something about the roof’s condition, and gutter cleaning is part of keeping water running clear off the roof. The crew sends an arrival photo, so no one needs to be home for the wash to go ahead.
Lafayette Roof Cleaning sends dated before-and-after photo reports with the job, so a homeowner has a record of what the roof looked like before the wash and what it looks like after. The business is fully licensed and insured in Louisiana, and every job carries a 100% satisfaction guarantee, which means a re-clean free if any part of the job falls short. Free estimates come back within 2 hours, and same-week scheduling is available. See the service areas page for the towns served, or contact us for an estimate. Call (337) 270-9758. For the full service, see roof cleaning.
Questions About Asphalt Shingle Roof Cleaning in Lafayette
Can asphalt shingle roof cleaning damage my roof?
A soft wash done the ARMA way does not strip granules, because the cleaning solution does the work and the rinse is low pressure. High pressure is what damages a shingle roof: it pulls granules off, and granule loss is permanent. Cleaning cannot restore granules that are already lost, so a roof that has already shed heavily needs a roofer’s opinion, not a wash.
Do black streaks mean my shingles need replacing?
No. Black streaks alone are algae feeding on the limestone filler in the shingles, and they are a surface problem. A soft wash lifts them, and the roof underneath is usually sound. Streaks become a roofer question only when they come with lifted, curled, cracked or missing shingles, or with granules filling the gutters. See the guide on black streaks on roofs for the full detail.
How long do streaks take to disappear after a soft wash?
Streaks lighten over days to weeks after treatment, as the cleaning solution keeps working on the algae and rain rinses the dead growth away. Lichen takes longer, because it bonds to the shingle and needs time to detach fully after treatment. No honest cleaner promises that every mark is gone on the day of the wash, and a stain judged while wet can look different once it dries.
Will a soft wash void my shingle warranty?
The manufacturers’ association, ARMA, recommends low-pressure chemical cleaning for asphalt shingles, and a soft wash follows that method. High pressure is what risks warranty trouble, because it strips granules and works against how the maker specifies the roof should be cared for. Warranty terms vary by maker, so the warranty itself is the final word, but the cleaning method used here is the one the association recommends. For pricing, see what roof cleaning costs in Acadiana.
Can you clean a shingle roof with moss on it?
Yes. Moss is treated with a chemical kill followed by a low-pressure rinse, so the mat dies and releases without taking the shingle surface with it. Moss must never be scraped or pressure washed off, because that strips granules with it. If moss has already lifted shingle courses badly, a roofer should look at the roof first, because lifted shingles are a repair question, not a cleaning one.
What if my gutters are full of granules?
Granules in the gutters are a sign of roof wear, and they mean granules have already been lost from the shingle surface. Cleaning cannot put them back, so that is a roofer conversation about the roof’s condition. Gutter cleaning clears the gutters themselves, but it does not change what the granules say about the roof.
Do you clean asphalt shingle roofs in winter?
Yes. Winters in Lafayette are mild, with only about 5 sub-freezing days a year and essentially no snow, so there is no season when a roof cannot be cleaned. Hurricane season runs June 1 to November 30, and a wash in spring or autumn is a good window, but the service runs year-round and same-week scheduling is available.
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