Can I Pressure Wash My Roof?

Dirty roof driving you mad? Well, you may want to think twice before you haul the pressure washer up there and blast that dirt and moss to smithereens. While pressure washers are known for getting what most might consider “uncleanable” surfaces looking like new, they can do more harm than good to your roof.

Man Pressure Washing a Roof

Do Roofs Need To Be Cleaned?

You’re not wrong for thinking that dirty roof of yours needs to be cleaned. Most roofs are subject to a lot more than just precipitation every now and then. In fact, in most areas of the country, roofs are subject to moss, lichen and other organisms that move in and call your roof home. 

But can they damage your roof? They certainly can and neglecting to wash them away could severely damage the shingles as well as the structure underneath.

How To Clean A Roof

In most cases, a pressure washer is not necessary to get your roof clean. Generally speaking, a mild detergent and a garden hose will do the trick, even if you do have organisms growing on the roof. (We recommend using a good quality biodegradable detergent).

However, if you still find yourself with a dirty roof after giving it a good rinse, and you feel like a pressure washer is the only thing left that might do the trick, have at it. Just make sure you keep the washer on the softest or lowest setting as too much pressure will strip your shingles of their protective granules. 

Most importantly, NEVER shoot your pressure washer up the roof. This can cause water to push underneath the shingles which could either tear them off or force water to enter your home.

Have additional questions about your roof? That’s where we come in! At Preferred Exterior, we have decades of experience handling any type of residential roofing jobs. From simple repairs and re-roofing to complete removal and replacement, we will do the job right the first time. Call us today at (516) 354-7252.

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