Exterior Cleaning · Property Services

Roof Moss Removal & Treatment

Bay Area humidity and shade create ideal conditions for moss and algae to colonize roofs, driveways, and walkways — and spread fast. NorTech connects you with vetted local providers who kill existing growth and apply preventive coatings that slow regrowth for months. Pricing set by local pros means you see the full cost before treatment begins.

Pricing set by local pros

72-hr satisfaction guarantee

Before & after photos

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72-hr satisfaction guarantee

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Before & after photos

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Moss and algae treatment across the Bay Area

From the fog-drenched avenues of Daly City to the shaded oak canopies of Los Altos Hills, the Bay Area's mild, moist climate is a near-perfect breeding ground for moss and algae. NorTech connects you with background-checked, vetted local providers who treat roofs, driveways, concrete walkways, and patios — all at a price you approve before any work begins. No hourly surprises, no ambiguous estimates, just clean surfaces and a preventive coating applied to slow regrowth. Whether you are in the South Bay, across the East Bay, or anywhere on the Peninsula, your provider brings the right treatments and equipment to tackle the buildup where it lives.

Every surface, every property type — one trusted platform

Moss and algae do not stick to one surface, and pros on NorTech do not either. Treatment covers asphalt shingle and tile roofs, concrete and pavers driveways, front walkways, rear patios, side-yard paths, and retaining walls. Every visit includes a kill treatment for existing growth and a preventive coating to discourage regrowth. NorTech connects vetted local providers with single-family homeowners, multi-unit property managers who need multiple addresses handled efficiently, high-end residential clients protecting premium hardscape, rental-turnover teams preparing a property between tenants, and short-term-rental hosts who need curb appeal restored fast. Whatever the surface or property type, the booking process is the same: price, vetted provider, no hassle.

Removing moss without damaging the roof

Moss lifts shingle edges and holds moisture against the roof. Your provider removes it by hand rather than with aggressive pressure, applies an eco-safe algae and biocide treatment, rinses, and can fit zinc or copper strips along the ridge to slow regrowth. Roof size, number of stories and pitch decide how much access work is involved, so each is a question on the booking screen. The price you see is built from those answers.

When to book roof moss removal & treatment

Your roof shingles show dark green or black streaks after a wet winter and you want them cleared before the dry season bakes the growth in deeper.

The concrete driveway or front walkway has turned slippery with algae after months of morning fog and shade — a real slip hazard for residents and visitors.

You are preparing a rental or short-term-rental property for new guests and the moss-covered patio or stained pathway is hurting first impressions and online reviews.

Your HOA or city inspection flagged visible moss accumulation on the roof as a maintenance violation and you need documentation that the problem was treated.

You noticed soft, spongy patches of moss lifting the edge of roof shingles and you want the growth killed and a preventive coating applied before moisture gets underneath.

You just power-washed the driveway but the algae came back within weeks — this time you want a treatment that includes a preventive coating, not just a rinse.

72-Hour Satisfaction Guarantee

If something was missed, report it within 72 hours and your provider makes it right — free.

Licensed contractor only

Done by a licensed contractor

This work is booked only with an independent contractor who holds the California license it requires, and whose license NorTech has checked against the state record. It is never handed to someone who is still working toward one.

Which work needs a license

Frequently asked

Roof Moss Removal & Treatment — common questions

Roof size, whether the home is one story or two, and the pitch of the roof (low and walkable versus steep) set the price, with zinc or copper preventive strips as an optional upgrade. The total reflects your answers and is shown before booking.

Yes. Every NorTech moss and algae treatment is backed by a 72-hour Satisfaction Guarantee. If an area was missed or the preventive coating was not applied correctly, report it within 72 hours and your provider will make it right at no additional cost. Moss that grows back later with Bay Area fog and rain is natural regrowth and is not covered. Before-and-after photos are taken on every job so the condition of the surface is documented for both you and the provider.

Pros on NorTech select treatments appropriate for the surface being treated — asphalt shingles, tile, and concrete each call for different application methods and dilutions. Your provider will confirm the surface types before starting. If a surface has pre-existing damage that could be worsened by treatment, your provider will flag it before proceeding.

Both. The up-front moss and algae treatment covers roof surfaces, driveways, and walkways in a single visit. The preventive coating is included on all treated surfaces. If you have additional areas — a rear patio, side-yard path, or retaining wall — note them when booking so your provider arrives prepared.

The preventive coating significantly slows regrowth, but the Bay Area's fog and rainfall mean moss and algae will eventually return — typically the coating buys one to several seasons depending on shade, surface type, and local moisture levels. The 72-hour Satisfaction Guarantee covers the application itself; for long-term maintenance, many property managers and homeowners schedule an annual treatment before the rainy season begins.

For exterior surfaces like driveways, walkways, and the roof, you generally do not need to be present as long as the provider has access to the areas being treated and an outdoor water source. Your provider will confirm access requirements when your booking is confirmed. Before-and-after photos are shared with you so you can review the completed work whether or not you were on-site.

Didn’t find your answer? Nova, our AI assistant, is in the chat bubble in the bottom-right corner and can help anytime.

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