Roof Cleaning in Addison, TX

Roof cleaning in Addison — those streaks aren't dirt

The black streaks running down your north-facing roof aren't stains and they aren't dirt. They're a cyanobacteria called Gloeocapsa magma, and they're alive. They feed on the limestone filler in asphalt shingles, which is why they spread downward in streaks and why they come back if you only rinse them.

Never pressure wash a roof

This is the most important thing on this page. Asphalt shingles are covered in ceramic granules — that's the layer that blocks UV and makes the shingle last. Pressure washing blasts those granules off. The roof looks great for a season and then ages years in a hurry, and most manufacturer warranties are explicitly void the moment someone puts a pressure washer on them.

If someone offers to pressure wash your roof, that's the end of the conversation. They're either uninformed or they don't care, and neither is who you want on your roof.

Soft washing is the actual method

Roof cleaning is done at barely more than garden hose pressure, with a solution that kills the organism rather than knocking it off. It's the method the shingle manufacturers themselves specify, and it's the only approach that doesn't shorten your roof's life. The streaks release over the following days rather than instantly — that's the treatment working, not a failure.

Why Addison roofs get it

Heat, humidity, and shade. North-facing slopes stay damp longest, so that's where it starts. If you've got mature trees — a lot of Richardson and parts of Carrollton — you've got more shade and it moves faster. It's not a sign you neglected anything; it's what happens here.

It's not just cosmetic

The organism holds moisture against the shingle and feeds on its filler. Left long enough it genuinely shortens roof life. Cleaning it isn't only about curb appeal, though the curb appeal difference is dramatic — it's the cheapest thing you can do for a roof you'd like to keep.

What we'll tell you honestly

If your roof is near the end of its life, cleaning it is putting money into something you're replacing soon. We'll say that. And if we get up there and find damage, you'll hear about it — we're not roofers and we're not selling you one, which is exactly why our read is worth something.

How long the results last

A properly soft-washed roof typically stays clear for several years in North Texas, depending on shade and tree cover. Under heavy canopy it comes back faster because the conditions that grew it are still there. Anyone promising a permanent fix is selling something — the organism is airborne and your roof is outside.

Gutters and landscaping during a roof clean

The solution and the released growth run off the roof, which means into your gutters and onto whatever's below. We water plants down beforehand, cover what needs covering, and flush the gutters after. If your gutters need clearing anyway, doing it in the same visit makes sense — see gutter cleaning.

Tile and metal roofs

Addison has both. Concrete tile is more durable than asphalt but the same rule applies — it's soft washed, because walking a tile roof cracks tiles and pressure blows out the underlayment at the overlaps. Metal roofs clean easily and mostly need the right solution and a careful rinse so nothing pools in the seams.

Where the streaking is worst

North-facing slopes under trees. That's most of Richardson and the older parts of Carrollton. Larger roofs across North Dallas get the same organism, just across more square footage — which is exactly where a granule-stripping mistake gets expensive.