If you have mold and algae growing on your metal roof, you may wonder if there is anything you can do to remove the fungal growth and keep it from returning. If so, use one or more of the tips below to restore your roof's beauty and prevent possible rust damage.
Avoid Standing On The Roof While It's Wet
Before you start cleaning your roof, a word about safety is in order. Because the metal can become very slippery while wet, avoid standing or walking on your roof. Whenever the tips below talk about scrubbing the roof by hand, spot clean the metal so you do not risk slipping and falling.
Spray White Distilled Vinegar On Your Roof
If the mold or algae growth is widespread, you can spray white distilled vinegar on your roof to kill it. The acetic acid in the vinegar soaks into the fungi, burning them down to their roots. Once the roots have been fried, you can easily remove the dead growth.
To apply the vinegar, fill a hose attachment spray bottle three-quarters of the way with the liquid. Then, attach it to your garden hose, and adjust the nozzle to spray a light mist. Saturate the roof with the vinegar and water mixture.
You may need to refill the bottle midway through the application, depending on the size of your roof. If the vinegar's odor becomes faint, this is a sign you need to refill the bottle.
Once you have applied the vinegar, let it soak into the fungal growth for a few hours, preferably in the sun to increase the absorption rate. Then, use a high-power stream or a pressure washer to rinse off the dead fungi and vinegar.
Use TSP On Stubborn Fungal Growth
After applying the vinegar solution, you may find several spots of stubborn fungal growth. If that is the case, you may need to use something stronger, like trisodium phosphate, or TSP. This solution is a powerful anti-fungal. You will also need a small bucket of warm water and a scrub brush.
Use caution when applying TSP, since it could irritate your skin, eyes, or lungs. Wear gloves, safety goggles, and a mask to protect yourself.
To apply the TSP, mix the amount recommended on the package with the water. Then, dip the brush into the solution, and scrub the area. Let it soak in for a few hours, then use your garden hose or pressure washer to rinse.
Have Zinc Strips Installed On Your Roof
Once you have removed any current mold or algae growth on your metal roof, you may want to see about having zinc strips installed at the peaks and around the edges. Zinc is poisonous to the fungi and can help prevent future spores from taking root and sprouting.
Although zinc strips are sold in rolls that you can apply yourself, you may want to think about having them professionally applied by a professional roofer. The zinc strips you buy are applied with an adhesive backing, but they may start peeling up after a year or two.
When you have zinc metal strips put in place by a roofer, they can nail them into the roof. This helps them last longer so they can continue to protect your roof against algae and mold growth.
Either during or after cleaning your roof, you may find rusted areas caused by the constant moisture beneath the algae or mold. If so, you may want to contact a roofing company, such as National Roofing Of Collier Inc, that specializes in metal roofs to have them inspect the damage and discuss your options for either repairing or replacing the roof.