From Filthy to Fresh.

What is the Science Behind Pressure Washing?

Your home’s exterior is constantly under attack from a combination of dirt, pollution, and biological growths. These aren’t just unsightly — they are living organisms with names, life cycles, and destructive habits that damage your property. Such as:

Algae – Gloeocapsa magma

  • This is the most common culprit behind the dark streaks and stains you see on asphalt shingles and siding.

  • A cyanobacteria (blue-green algae), Gloeocapsa magma thrives in humid, shaded conditions and feeds on the limestone filler in asphalt shingles.

  • As it spreads, it traps moisture and heat, weakening shingles and causing premature aging.

    Moss – Bryophyta (general classification, includes species like Bryum and Dicranum)

  • Moss grows in thick mats on shaded roofs and damp siding.

  • Unlike algae, moss has small root-like structures called rhizoids that burrow into shingles, tiles, or brickwork.

  • Over time, these roots lift and crack materials, allowing water intrusion and leading to costly roof leaks.

How Does Pressure Washing NeutralizeThese Organisms?

  • Algae & Cyanobacteria → Our soft washing methods use specialized cleaning solutions that break down the protective sheath of Gloeocapsa magma, killing it at the root so it doesn’t return quickly.

  • Moss & Lichen → Gentle chemical treatments loosen rhizoids and fungal bonds without damaging shingles, followed by a low-pressure rinse to remove the growth safely.

  • Mold & Mildew → Biodegradable fungicides eliminate spores and surface colonies, stopping regrowth while ensuring safety for your family and pets.

Lichens – Symbiosis of fungi and algae (e.g., Cladonia or Lecanora species)

  • Lichens are a hybrid organism, combining algae (which photosynthesizes) and fungi (which provide structure and grip).

  • They attach firmly to roofs and stone surfaces, secreting acids that chemically degrade roofing materials.

  • Lichens are extremely resilient and can survive in harsh conditions, making them especially difficult to remove without professional soft washing.

Mold – Fungi such as Aspergillus, Cladosporium, and Alternaria

  • Mold thrives on shaded, damp siding, decks, and fences.

  • These fungi not only discolor surfaces but also release airborne spores, which can cause allergies and respiratory irritation in humans.

  • Left untreated, mold can penetrate porous building materials and create long-term health risks.

Why Does This Matter to Homeowners?

By removing these organisms, pressure washing does far more than clean:

  • Prevents biological decay of roofing and siding.

  • Stops heat retention caused by dark algal streaks, which drive up cooling costs.

  • Reduces allergen exposure from mold spores.

  • Eliminates slip hazards on sidewalks and driveways caused by algae and mildew buildup.

  • Extends the structural lifespan of roofs, siding, decks, and concrete.