How to Remove mold and algae from your Commercial Roof
Published On:  May 9, 2022
roof algae and mold

How to remove roof algae and mold


Algae and mold generally grow under warm moist conditions. If you have algae or mold growth on your commercial roof or flat roof, it can be a sign of a bigger problem.

Although commercial roofs are low sloped, there is still a slight pitch to ensure that water on the roof is directed toward the roof drains.  If your roof has algae or mold, it could be a sign of a roof leak or bigger problem.

The best solution is to contact your roof contractor to inspect the roof and determine if there are any underlying issues that could be causing the algae or mold.  If there are any roof leaks, the roofing contractor will be able to resolve those leaks.

There are many types of commercial roofs including:  Built-up Roofs, SBS, and APP, TPO, EPDM, and PVC.

If you intend on cleaning your roof yourself, make sure you are using the right products for your particular roof.  Both TPO and PVC roofs can be cleaned with a low-pressure power washer (under 2000PSI) with a rotating cleaning attachment.  Don’t use the wand attachment as it produces too much focused pressure.  You need to be careful what cleaning products you use to get rid of the mold and algae as well. The cleaning products should be a mild non-abrasive household detergent.  It’s important to protect curbs and base flashing if you are going to power wash your roof on your own.

If you do not feel comfortable performing cleaning on your own, it is always best to contact your roofing contractor.  If you live in Manitoba, you can contact Camco Roofing Ltd for assistance on properly cleaning and maintaining your commercial roof.

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