Roof Cleaning in Clarendon, Virginia

No \— that's exactly why we don't pressure wash. Our soft-wash process uses low-pressure application and a cleaning solution formulated for asphalt shingles, which is the method most major shingle manufacturers specify to keep warranties intact. High-pressure washing is what strips granules and voids warranties; we never use it on a roof.

Those streaks are Gloeocapsa magma, a airborne algae that lands on shingles and feeds on the limestone filler in the granules. It has nothing to do with gutter maintenance \— it's a biological growth issue tied to moisture and shade, which is why it shows up first on north-facing slopes and in Clarendon's more tree-covered blocks like Lyon Village and Ashton Heights.

It's worth addressing before the next wet season. Moss holds moisture directly against the shingle and can work into the granule layer and eventually the underlayment on older roofs, especially the dormer valleys common on Clarendon's 1920s-1940s housing stock. We remove it with the same low-pressure soft-wash approach, then treat to slow regrowth.

Yes. Part of our process is inspecting and flushing gutters and downspouts after the soft wash, since runoff from the cleaning carries loosened algae and debris that needs a clear path off the roof, not a clogged one. Our crews work Clarendon regularly, so scheduling is usually available within the week outside the spring rush — and every visit ends with before-and-after photos of the finished work.

It depends on tree cover and roof orientation. A shaded, north-facing roof in Lyon Park or Colonial Village under mature canopy may need attention every 1-2 years; a more exposed roof near the Clarendon Metro corridor with less overhang can often go longer between cleanings. We'll give you a straight answer after inspecting your specific roof, not a one-size-fits-all schedule.

Yes. The low-pressure method and our rinse protocol are designed to protect plantings, siding, and gutter systems, and we take care to pre-wet and rinse surrounding vegetation as part of the job. Our crews work Clarendon regularly, so scheduling is usually available within the week outside the spring rush — and every visit ends with before-and-after photos of the finished work.

Yes — it is the method shingle manufacturers recommend. Low pressure and proper chemistry remove growth without stripping granules or voiding warranties, which is why we never put a pressure washer on any roof. Serving Clarendon and all of Arlington. Our crews work Clarendon regularly, so scheduling is usually available within the week outside the spring rush — and every visit ends with before-and-after photos of the finished work.