Can a roof be cleaned when the gutters are full?

The Metal Roofing Alliance sets the order in writing: "Clean out all gutters and downspouts and remove any large rooftop debris such as branches," the first step in its cleaning guide for metal roofs, ahead of the hose, the detergent solution and the rinse that follow it. ARMA publishes a related idea in its own words, clearing debris that accumulates on the roof as regular maintenance. TRI Alliance ties the same kind of debris to drainage from its own angle: excessive debris such as leaves and pine needles should be removed from gutters and valleys to ensure the proper flow of water.

Only the Metal Roofing Alliance puts that clearing in a numbered order with the wash. ARMA describes it as part of a regular maintenance program and TRI Alliance as a matter of water flow, and none of the three makes clearing debris part of the wash itself.

ARMA's algae and moss bulletin ties gutters directly to drainage: keep gutters clean to promote proper water drainage, and do not let an upper roof's gutters drain directly onto a lower roof. A wash sends water toward the gutters on top of whatever is already sitting in them, first the solution and then the rinse that ARMA's procedure ends with, a rinse ARMA warns should come before the solution dries completely.

A gutter already full of leaves has less room for that water, so it spills or backs up somewhere other than the downspout. That is reasoning about drainage rather than a line any document prints, and it is why full gutters are worth mentioning before the day rather than discovering during it.

Whether a given crew proceeds when the gutters are full, clears them first, or reschedules is not written in any document read for this page, and it is not a rule this page states. What is published is that clean gutters serve drainage; that a wash sends its water to them is plain reasoning. Whether the solution or the rinse itself does anything to the gutters is a related question, answered at roof cleaning and gutter damage.

Clogged downspouts and ongoing drainage trouble go to a gutter or roofing contractor. Debris on the roof surface itself is a separate question, covered at roof cleaning and leaves or debris, and what a roof cleaning estimate looks at is its own answer as well.

Once solution and rinse water leave the roof, where it actually goes is its own answer, at roof cleaning runoff, and the general term for that water is defined at runoff. TRI Alliance names valleys, where two roof slopes meet, alongside gutters as places to clear of leaves and pine needles; the word is defined at valley.

What a rinse itself looks like, apart from the gutters around it, is answered at does a roof get rinsed after soft washing. Full gutters are a fair detail to put in the project details when an estimate is requested.