Boise and the Treasure Valley

Algae, Moss & Lichen Shingle Roof Cleaning in Boise, ID

Soft-wash algae, moss, and lichen removal for Boise shingle roofs — north-facing and tree-shaded slopes hold moisture longest and show dark streaking and moss growth first, and pressure washing strips the granules that protect the shingle underneath.

Typical range: $300–$800 typical soft-wash cleaning job (whole roof)

Call (208) 279-6903

Algae, Moss & Lichen Shingle Roof Cleaning underway on a property in Boise, ID

Full tear-off, never a shingle roof-over

Manufacturer wind-rating matched to the product

Permit pulled on every job

Written per-square shingle pricing

Old shingles hauled away

Last updated: 2026-08-19

Shingle Roofing Boise is a roofing company serving Boise and the Treasure Valley, and algae, moss & lichen shingle roof cleaning is one of the services we handle most. This page covers what the work involves here specifically — the climate, the code, and what it costs — rather than what it involves in general.

What we do on the first visit

The first visit is an inspection, not a sales call. We walk the roof with you, check the deck from the attic side where we can, count valleys and penetrations, and note the pitch and how much staging or safety equipment the job needs. We confirm whether any prior layers are on the roof already — code allows a maximum of two before a full tear-off is required — and then you get a written per-square price with tear-off and any deck repair as separate lines.

If we think repair is the better spend than replacement, or a different material suits your situation better, we say so on that visit — including when it means the smaller job for us.

What's included

Roof inspection identifying algae streaking, moss growth, and lichen versus other staining
Soft-wash treatment using low-pressure application and a roof-safe cleaning solution
Manual removal of moss clumps at valleys, ridges, and shaded slopes before chemical treatment
Rinse and neutralization of the cleaning solution to protect landscaping and gutters below
Gutter flush to clear moss and debris washed down during the cleaning
Inspection of shingle mat condition underneath removed moss, since trapped moisture degrades shingles fastest there
A recommendation on zinc or copper ridge strips to slow algae and moss regrowth
Before-and-after photos of the treated slopes

What this costs in Boise

Algae, Moss & Lichen Shingle Roof Cleaning runs $300–$800 typical soft-wash cleaning job (whole roof) in this area. Directional range for a professional soft-wash algae/moss treatment, varies with roof size and severity. The things that move a job up its range are tear-off, how much deck repair is needed, pitch, and how many valleys and penetrations your roof has. If you want a number before you call, the roof cost calculator will get you close.

When it needs doing

Dark streaking running down north-facing or tree-shaded slopes
Green moss buildup in valleys or along the ridge line
Lichen — crusty gray-green patches — showing up on older shingles
Granule loss concentrated specifically under moss patches
Gutters filling with moss and debris after rain
Certain areas of the roof staying visibly damp longer than the rest
Neighboring roofs on the same street showing similar staining or moss patterns

DIY shingle patching, the cheapest bid, or the job done properly

	DIY weekend	Cheapest bid	Done properly
Shingle match	Whatever the box store has in stock, rarely the same batch/color	Closest shelf match, color mismatch accepted	Matched to the existing run where possible, disclosed honestly when it can’t be
Old layers	Shingled over if code technically allows it	Roofed over to save a step	Full tear-off — the only way to see what’s underneath
Sealant-strip bonding	Installed whatever the weather, no temperature check	Installed on schedule regardless of temperature	Held to manufacturer install-temperature spec so the strip actually bonds
Fastening	Nail gun set to whatever pressure	Meets code minimum, nothing more	Manufacturer wind-rated pattern matched to the shingle line
Permit	Often skipped	Sometimes skipped	Pulled and inspected every time
If it fails	Your weekend, again	Chasing a phone number that stopped working	We come back and fix it

How it works

How algae, moss & lichen shingle roof cleaning runs

01
Inspect & scope
Identify which slopes have algae streaking, moss, or lichen, and how heavy the growth is before choosing a treatment approach.
02
Manual moss removal
Hand-clear heavy moss clumps at valleys and the ridge before any chemical treatment goes down — moss traps water against the shingle even after cleaning.
03
Soft-wash application
Low-pressure application of a roof-safe cleaning solution — no pressure washing, which strips the granules that protect the shingle.
04
Rinse & inspect
Neutralize and rinse the solution, flush the gutters of loosened debris, and check shingle condition where moss had been sitting.

Get a free algae, moss & lichen shingle roof cleaning estimate

A real person answers. We walk the roof with you, check the deck, and give you a written per-square price — at no charge and with no pressure.

Call (208) 279-6903

Questions

Algae, Moss & Lichen Shingle Roof Cleaning questions

Will pressure washing damage my shingles? Why do you use soft-wash instead?

Pressure washing blasts off the granules that shield the asphalt mat from UV damage — once those are gone, they don't come back, and the shingle ages faster. Soft-wash uses low pressure and a cleaning solution to kill algae and moss without stripping the surface.

Those black streaks — is that mold, or something else?

It's usually Gloeocapsa magma, a blue-green algae that feeds on the limestone filler in shingle granules, not mold. It's cosmetic on its own but signals a roof that stays damp longer than it should, which is worth checking.

How often does a shingle roof need algae or moss cleaning in Boise?

Depends heavily on shade and slope orientation — a sunny south-facing roof may never need it, while a tree-shaded north slope might need cleaning every 2-4 years. We'll tell you what your specific roof actually needs during inspection.

Will cleaning make my roof look new again, or is staining permanent once it sets in?

Most algae streaking and moss come off fully with soft-wash treatment. Deep-set lichen or long-term staining on older, weathered shingles may lighten but not fully disappear — we'll set expectations before starting, not after.

Do you charge for an estimate?

No. Estimates are free across Boise and the Treasure Valley, including the drive. We walk the roof with you, check the deck from the attic side where we can, and hand you a written per-square price with tear-off and any deck repair broken out as their own lines.

Also worth a look

Related services

Architectural Shingle Roof Replacement

Full tear-off architectural (dimensional) shingle replacement for Boise and Treasure Valley homes, installed to manufacturer temperature and fastening spec so the sealant strip actually bonds — with a written per-square price before any work starts.

Shingle Roof Repair

Targeted repair for isolated leaks, wind-torn shingles, and failed flashing on Boise and Treasure Valley homes — scoped and priced to the actual damaged area, not sold as a full replacement you don't need yet.

Shingle Color & Style Selection

On-site help picking a shingle color and profile that holds up against Boise's intense summer UV and shows true against high-desert sun glare, using full-size samples laid against your actual siding and trim.