Can I stay home during roof cleaning?

ARMA's own instruction starts with the person holding the sprayer, not the household: "Use normal precautions for handling bleach, including eye protection and rubber gloves." That is the shingle association's line for whoever applies its algae solution, a mix of liquid household bleach (sodium hypochlorite) and water that ARMA says lightens discoloration rather than removing it. It is ARMA's recipe for asphalt shingle, not a description of every soft wash on every roof.

A second ARMA bulletin, written for algae and moss together, gives the same caution in its own words: "Take proper precautions to protect landscaping and surrounding areas from the chlorine bleach solution. Use appropriate personal protective equipment when working with chlorine bleach." Two documents, one instruction: protect the person applying a bleach solution, and protect what surrounds the roof.

Neither bulletin says who should be inside the house while that happens. What they publish is the handling instruction for the solution itself, and a household weighs that the same way it weighs any yard chemical: by what the label says, not by a published stay home rule.

Liquid household bleach is sold as a retail product, and one maker, The Clorox Company, publishes safety data sheets for its own. ARMA names no brand, so the link to a roof is the ingredient, not the bottle. The 2019 sheet for Clorox Disinfecting Bleach2 classifies the undiluted product as corrosive to skin and eyes, warning that it "Causes severe skin burns and eye damage."

A 2021 sheet for Clorox Disinfecting Bleach carries the hazard statement "Causes skin irritation. Causes serious eye damage." with the signal word Danger, and tells anyone handling it to "Avoid breathing vapors and use only in a well ventilated area." Those are the retail product's own words, printed with the product named, and neither sheet describes any solution a cleaning company mixes.

Spray that drifts off a roof can reach the windows below it. The National Glass Association's technical paper on cleaning architectural glass names bleach and other solutions containing sodium hypochlorite among the materials that may cause harm to laminated glass. Impact windows are built with laminated glass, so where a roof wash uses bleach, keeping it off the glass below is part of the work rather than a favor, a point set out at overspray.

No document read for this page tells a household who stays and who goes. The nearest published step about the yard comes from paver work: ICPI's Tech Spec 5 says to turn off all automatic sprinkler systems during cleaning, sealing and drying, one of the ground-level precautions the method page sets out at what happens around the roof.

Several related questions have their own pages rather than a paragraph here. Whether pets should stay inside during the work, what a soft wash smells like, and whether to close windows first are each answered on their own terms. So is drift toward a neighboring yard, covered at the ground-level page linked above.

One label word is easy to misread. GAF's own shingle mixture lets a phosphate-free substitute stand in for its TSP while the gallon of bleach stays in the mix, so phosphate-free describes one ingredient left out, not the vapors or the skin and eye lines above. The one fixed point is the estimate: 239 Exteriors gives free estimates by phone or through the form on this site, and that conversation is the place to ask about being home on the day.