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Should You Treat Your Roof Yourself? A Utah Homeowner's Guide to DIY Roof Sprays vs. Hiring a Pro

November 4, 2026

Hardware stores and online sellers carry roof sprays you can apply yourself: moss and algae killers, sealers, and products sold as shingle “rejuvenators.” If your asphalt roof is starting to look tired, it’s fair to wonder whether you can save money and do it yourself.

This guide from The NewRoof Guys looks at that question honestly. The short version: the product is the easy part. The hard parts are getting onto a sloped roof safely, knowing whether your roof is even a good candidate for treatment, and getting even coverage. We’ve kept verified facts, manufacturer claims, and our own interpretation separate so you can weigh each one.

The real risk is the roof, not the spray

Every roof treatment, DIY or professional, means someone is standing on a sloped surface, usually after climbing a ladder. The injury data on that is sobering.

• Ladders put a lot of people in the ER, mostly at home. A national study in the American Journal of Preventive Medicine (D’Souza, Smith, and Trifiletti, 2007) used the federal NEISS injury database and estimated an average of 136,118 ladder-related injuries treated in U.S. emergency departments each year from 1990 through 2005. In the authors’ words, “Of the cases for which locale of injury was recorded, 97.3% occurred in non-occupational settings, such as homes and farms.” The study also found that “Nearly 10% of injuries resulted in hospitalization … or transfer to another hospital.”
• Roof work is where professionals get hurt, too. NIOSH, the federal worker-safety research agency, states that “Falls are the leading cause of death among construction workers.” It reports that roofers “accounted for 874 out of the 2,013 (43%) fatal falls in the construction sector between 2011 and 2017,” and that U.S. roofers had “36 deaths per 100,000 full time employees (FTEs), which was ten times greater than the rate of all other construction occupations in the U.S. combined.”
• Sloped roofs throw off your balance. The same NIOSH bulletin explains that “Walking across a sloped roof surface decreases postural stability and results in greater sway compared to walking on a level surface.”
• Weather and working alone make it worse. A NIOSH fact sheet on preventing falls from roofs lists contributing factors that include “Working alone when working at elevations” and “Working during inclement weather (e.g., wind, rain).” On wind, NIOSH says that “At 25–30 mph and greater, the strong breeze can make work at elevation unsafe and this type of work should cease.”

Professional crews are expected to work with protection that most homeowners don’t own. Under the federal OSHA construction standard (29 CFR 1926.501(b)(13)), “Each employee engaged in residential construction activities 6 feet (1.8 m) or more above lower levels shall be protected by guardrail systems, safety net system, or personal fall arrest system,” with limited exceptions.

What that means for you (our interpretation): a homeowner spraying a roof alone, without a harness and anchor, is taking on the very risks the safety data warns about. A sprayed roof is also a wet roof while you’re standing on it. And in Northern Utah, late fall and winter bring frost, snow, and gusty days, which make roof footing worse, not better.

Is your roof even a candidate?

Getting the job done safely is only half of it. The other half is knowing whether a treatment makes sense at all.

Rejuvenation is not right for every roof. It’s meant for asphalt shingle roofs that are aging but still sound. Shingles that are brittle, badly curled, cracked through, missing large patches of granules, or sitting on soft or damaged decking aren’t candidates. Those roofs need a repair or a replacement, and spraying them only delays an honest answer. A treatment also doesn’t fix a leak, a failed pipe boot, or loose flashing.

That’s the step a DIY project skips. Before any treatment, someone should look closely at the shingles, flashing, vents, and decking and tell you whether the roof is a candidate. Our guide on whether your Utah roof is a candidate for rejuvenation walks through the signs, and our post on roof sealing vs. rejuvenation explains how the product types differ.

Coverage and product questions

Even on a good-candidate roof, results depend on applying the product the way its maker specifies, at the rate and in the conditions it lists. That’s hard to judge from the top of a ladder, and harder to check afterward.

Before anything goes on your roof, DIY or professional, it’s worth getting answers in writing:

• What exactly is the product, and what does its label or safety data sheet say about application conditions, plants, and pets?
• How does it interact with your shingle manufacturer’s warranty? Read that warranty yourself, too.
• What’s the plan for overspray onto siding, windows, cars, and landscaping?

What GoNano says (manufacturer claims)

GoNano, a roof-treatment manufacturer, covers this question in its article “Can You Rejuvenate a Roof Yourself? DIY vs. Professional” (October 27, 2026). It says, “Roof work means ladders, heights, and slick surfaces,” and argues that DIY skips the candidacy assessment, with results that are uneven and hard to verify. GoNano also says its own treatment is applied only by certified contractors.

Those are the manufacturer’s statements. We haven’t repeated GoNano’s testing or warranty claims here. If those matter to your decision, ask for the documents in writing and read them yourself.

The NewRoof Guys are an authorized GoNano installer in Utah. GoNano restoration is one of the options we may recommend, and only when the roof is a good candidate.

What homeowners can safely do from the ground

You don’t need to get on the roof to keep an eye on it. From the yard, the street, or with binoculars, you can:

• Look for curling, cracked, or missing shingles and dark or bare patches.
• Notice moss or dark streaks, especially on shaded slopes.
• Check splash blocks at the bottom of ground-level downspouts for heavy granule buildup.
• Note any water stains on ceilings after storms, and photograph what you see with the date.

Leave anything on the roof, and any gutter work on a two-story home, to a crew with proper fall protection. Our Utah roof maintenance checklist has more ground-level checks, and if you’ve had storm damage, our Utah homeowners insurance roof checklist covers what to document.

Questions to ask any contractor before they treat your roof

• Is my roof a repair, restoration, or replacement candidate, and why? Can you show me photos?
• Are you licensed in Utah? Utah’s Division of Professional Licensing (DOPL) licenses roofing contractors under the S280 Roofing Contractor classification, and you can look up any license yourself. Our list of questions to ask a Utah roofing contractor covers licensing, insurance, and workers’ compensation.
• What fall protection will your crew use on my roof?
• What product will you apply, and will you give me its label and safety data sheet?
• What’s in the written scope: prep, application, cleanup, and any follow-up?

Verified fact vs. marketing vs. interpretation

• Verified (primary sources): the D’Souza et al. (2007) ladder-injury estimates and their share in non-occupational settings; NIOSH’s statements on construction falls, roofer fatal-fall rates, sloped-roof balance, wind, and contributing factors; the OSHA 1926.501(b)(13) residential fall-protection requirement for employers; Utah’s S280 Roofing Contractor classification (Utah Admin. Code R156-55a-301).
• Marketing: GoNano’s description of the risks of DIY and of its own certified-contractor-only application.
• Interpretation (ours): that a homeowner spraying a roof alone without fall protection faces the risks the data describes; that a freshly sprayed roof and Northern Utah’s late-fall and winter weather make footing worse; and that a candidacy inspection is the step DIY usually skips.

Get an honest answer about your roof

The NewRoof Guys serve homeowners across Utah, with a focus on Northern Utah and the Wasatch Front. We’ll inspect your roof, show you photos, and tell you plainly whether it needs a repair, is a candidate for restoration, or needs to be replaced. If it isn’t a candidate for treatment, we’ll say so.

Email [email protected] or request your free roof inspection online.

Sources

• D’Souza AL, Smith GA, Trifiletti LB. “Ladder-related injuries treated in emergency departments in the United States, 1990–2005.” American Journal of Preventive Medicine, 2007. doi:10.1016/j.amepre.2007.01.012. https://doi.org/10.1016/j.amepre.2007.01.012
• NIOSH Science Blog/Bulletin, “Falls Campaign 2022: Making Research Work” (April 13, 2022), Summary, Residential Roofing, and High Winds sections. https://www.cdc.gov/niosh/bulletin/2022/falls-campaign.html
• NIOSH, “Prevent Construction Falls from Roofs, Ladders, and Scaffolds” (FACE fact sheet, Pub. 2019-128). https://www.cdc.gov/niosh/docs/2019-128/pdfs/2019-128Revised112019.pdf
• OSHA, 29 CFR 1926.501, Duty to have fall protection, paragraph (b)(13) Residential construction. https://www.osha.gov/laws-regs/regulations/standardnumber/1926/1926.501
• Utah Admin. Code R156-55a-301, License Classifications – Scope of Practice (S280 Roofing Contractor). https://www.law.cornell.edu/regulations/utah/Utah-Admin-Code-R156-55a-301
• GoNano, “Can You Rejuvenate a Roof Yourself? DIY vs. Professional” (October 27, 2026). https://gonano.com/en/blog/diy-vs-professional-roof-rejuvenation

Sources retrieved November 4, 2026. This article is general information, not safety training or legal advice.

GoNano is a trademark of its owner.

Frequently asked questions

Can I spray a roof treatment on my roof myself?

You can buy DIY roof sprays, but applying one means working on a sloped roof, usually after climbing a ladder. A 2007 national study estimated an average of 136,118 ladder-related ER visits a year in the U.S. from 1990 through 2005, mostly in non-occupational settings such as homes. We recommend leaving roof-level work to a crew with fall protection.

Is DIY roof rejuvenation worth it?

It depends first on whether your roof is a candidate. Rejuvenation is not right for every roof. It’s for aging but sound asphalt shingles, and a brittle, leaking, or badly damaged roof needs repair or replacement instead. An inspection answers that before you spend anything.

What fall protection do roofing contractors have to use?

Under OSHA’s construction standard, employers must protect workers doing residential construction 6 feet or more above a lower level with guardrails, safety nets, or personal fall arrest systems, with limited exceptions. Ask any contractor what their crew will use on your roof.

How do I check a Utah roofing contractor’s license?

Utah’s Division of Professional Licensing (DOPL) licenses roofing contractors under the S280 Roofing Contractor classification. You can look up a contractor’s license yourself on DOPL’s license lookup.

What can I safely check on my roof without climbing up?

From the ground or with binoculars, look for curled, cracked, or missing shingles, bare patches, moss or dark streaks, and heavy granules at ground-level downspout outlets. Photograph what you see, then have a professional inspect anything that concerns you.