The streak of dark stuff you see flowing down your shingles is most likely algae, and algae can reduce the lifespan of your roof. Cleaning products aren’t complicated, but the entire process comes with some risks, and knowing the process, safety and when to call in Top Tier Cleaners can help. Here is the proper way that how to soft wash a roof.
Soft Washing vs. Pressure Washing
Soft washing is to gently spray a cleaning solution and allow it to kill the growth, followed by a low-pressure rinse. It is like exterior deep cleaning, addressing the root cause of roof algae stains instead of removing it from the surface of the roof. The roofing associations advise against the application of excessive pressure on asphalt shingles as it tends to lose the granules in them, which protect them.
| Method | Pressure | Best for | Main risk |
| Soft wash | Low | Algae, moss and lichen on shingles | Runoff, slippery surface |
| Pressure wash | High | Concrete and other hard surfaces | Granule loss, water under shingles |
How to Soft Wash a Roof, Step by Step
- Select a calm, cool, and dry day, then inspect for any loose or compromised shingles.
- Wet and cover soil near plants and close windows and vents.
- Aiming from the ridge, spray down to the eaves, according to the product label.
- Allow it to sit for the dwell time on the label without drying out.
- Rinse lightly and repeat the process for plants and gutters.
Safety Rules and Mistakes to Avoid
The greatest risk is the fall, not the chemicals. Don’t step on the wet roof, and stick to the same rule regarding 6-foot fall protection as OSHA recommends for workers to follow; apply it to homeowners as well. Combining bleach with other cleaners can combine to create toxic gas, and items from a regular house cleaning job are not designed for roofing. If you spray up, water can get under the roof guard even when low-pressure roof cleaning is done.
Do It Yourself or Call a Professional?
The advantage of DIY is that it is cheaper in the short term, but it comes with several risks like falls, chemicals and damage. Professionals have insurance, equipment and experience, but the cost will depend on roof size, roof slope and the depth of the staining. When choosing providers of soft wash roof cleaning, inquire about insurance, plant protection, and what proactive measures they will take in regard to the roof manufacturer’s warranties.
How Often Does a Roof Need Cleaning?
If you live in a wetter climate, algae may grow in a few years and a seasonal check is advisable. If you’re running Airbnb cleaning services between guest visits, keep in mind that a dirty roof will be visible in listing images and make a bad impression on visitors.
Final Thoughts
How to soft wash a roof is about low pressure, proper preparation and treating it with respect for roof safety. Check first, follow the label and call a professional if you are concerned about height or damage. For those looking to sell or relocate, move in cleaning along with a “new roof” makes a perfect fit for a new start. Periodic inspections will also keep you from having to deal with the massive repair expenses that could be caused by minor issues.
Frequently Asked Questions
Is soft washing safe for shingles?
Typically, yes, performed at reduced pressure (product label). Fix any damaged shingles.
Can I do it myself?
Perhaps, but the roof is the primary danger; this is why numerous householders favor collaboration with the pros.
How long until the stains disappear?
Gradually recede over the next weeks as treated growth dries and rains wash away.