Does a clean roof make damage easier to see?

Two roofing sources speak to this directly, and read quickly they seem to disagree. Here are their own sentences, side by side.

Eagle's line is about what a clean surface lets a person see. TRI's line is about who is looking and what they know to look for. Both can be true at once: growth can hide a surface, and a surface can be in plain view to someone who is not trained to read it.

Neither source says a cleaning finds, measures or explains a problem. Eagle's verb is reveal, and TRI's warning is that the cleaner is the wrong person to notice what has been revealed.

Eagle's sentence comes from a spring article about Eagle concrete tile, and the article around it is a roofing maker's inspection advice rather than a case for cleaning as a check-up.

The article's condition is significant discoloration: “If you notice significant discoloration on your roof, you may want to consider having your roof cleaned by a professional.” The same article describes the owner's own look at a roof as a walk around the building, watching for water damage in the fascia areas, loose rain gutters or downspouts, and missing or cracked roof tiles seen from the ground.

Then it draws the line an owner is meant to stop at: “If you happen to notice any concerning areas during your springtime roof inspection, do not try to fix them yourself.” It names replacing broken roof tiles among the repairs a roofer may need to complete, and the question of whether fixing broken roof tiles is a cleaner's job has its own page.

TRI's overlook sentence follows its advice on who should clean a tile roof at all, and that advice does not favor a cleaning company.

TRI Alliance writes that if you choose to clean your tile roof, it urges you “not to do the work yourself or hire a cleaning company”, and recommends a roofing contractor instead, partly because of the dangers of walking on a wet tile roof. The overlook line is its second reason.

The guide also says what the trained eye is for. Debris such as leaves and pine needles should be removed from gutters and each valley to keep water flowing, and flashing details, which TRI lists as vents, plumbing stacks, skylights, solar panels and headwall details, “should be checked for damage during inspection.” TRI's interval for that inspection is its own, and it is an inspection interval rather than a cleaning one: “2 years after initial installation and every couple of years thereafter”.

Dark growth covers color and texture, so a crack or a chipped edge can be hard to pick out under it. Take the growth away and the tile faces are easier to see.

What a view from the ground does not change is what cannot be seen from there. On a barrel tile roof the curved faces and the ridge line show from the driveway; the underlayment beneath the tile does not, and TRI lists flashing details among what an inspection checks. Eagle's 2020 article describes a professional who “will first inspect your roof in order to make any repairs and tend to the recommended maintenance of the structure”, which puts the inspecting before the cleaning and in a roofer's hands.

Eagle's Owner Information gives the same routing: for inspection or repair, the original roofing contractor, and “If unavailable, select another qualified licensed roofing contractor.” The flat answer on condition is stated under what an exterior cleaner is not, and the scope line between the two trades is drawn in whether a roof cleaner is the same as a roofer.

Every source on this page sends a problem area to the same trade, and Florida's insurance statute adds a second name for one situation.

For condition and repair, that trade is a roofing contractor, in Eagle's words and in TRI's. For a roof an insurer wants inspected, Florida Statutes 627.7011(5)(a) defines an “authorized inspector” as “an inspector who is approved by the insurer” and who is one of the kinds the subsection lists, a roofing contractor among them. Whether a particular person qualifies is the insurer's call.

How that statute bears on the timing of a cleaning is argued in whether cleaning a roof before an inspection changes the result. The broader boundary, where a cleaning stops and a roofing contractor's work begins, is set out on where a cleaning stops and a roofing contractor starts.