5 Tips to Pressure Wash a Roof Like a Pro

wash a roof

Did you know it only takes moss six weeks to start growing? Having an excessive amount of build-up on your roof can be damaging and costly. If you don’t know how to pressure wash a roof, now is the time to learn.

Keep reading to find out everything you need to know about house pressure washing. These tips will help you safely clean your roof without compromising its structure.

1. Apply Detergent

Applying roof-safe detergent will help break up the moss, dirt, and any other particles that may be stuck. If there is a lot of mold built up, you may need to allow the soap to sit for a few extra hours.

2. Non-Slip Shoes

It’s important to wear non-slip shoes not only for your safety but to protect your roof. Walking on your roof with hard sole shoes could break your shingles. The water and soap will make the surface slippery, and a non-slip shoe will decrease your chances of falling.

3. Low Pressure

Using your pressure washer on low is one of the most important things to remember. If the pressure is too high, it will damage your roof.

Set your machine to the lowest setting and keep the hose as high as you can above the roof. Then, if you need more pressure, move the hose closer to the area. You can then slowly turn the pressure up as needed.

4. Spray Direction

It is also imperative that you spray the direction the shingles go. Washing upward or against the shingles will loosen them and could break the seal.

The moss or dirt could get pushed up under the roof, causing more mold build-up and decay. Spraying downward loosens the unwanted particles and allows them to run off the roof.

5. Where to Start

If you have a large roof or if you are still learning how to pressure wash a roof remember to do small sections at a time. Set up your ladder and be sure it won’t damage your gutters or any other portion of your home.

Once you are on your roof start at the furthest end. Slowly wash the sections in front of you, carefully backing up as you go. Cleaning the portion in front of your ladder last is best so you don’t track dirt over the freshly cleaned parts.


If pressure washing the exterior isn’t enough you may need to consider a new roof. The best commercial roofing company can answer your questions and help you determine if you need a repair or a replacement.

Pressure Wash a Roof

House maintenance and upkeep sometimes get pushed to the back burner when life gets busy. However, learning how to pressure wash a roof is important. It will keep your house looking nice and prolong its lifespan.

Replacing your roof will be much more costly than pressure washing it every once in a while. If you found our pressure washing guide helpful check out our page for more tips and tricks. (thenines.com)


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