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How to Pressure Wash a Roof: A Quick Guide from the Professionals

A pressure washer is a versatile tool in any homeowner’s arsenal. Still, if you’re looking up at a dirty roof and wondering if you can blast the grime away with your handy power washer, be warned — that probably isn’t such a good idea.

Read on to find out How To Pressure Wash A Roof can be dangerous and how you should do it instead!

Before You Pressure Wash Your Roof, Consider These Things

Start On The Far End From The Ladder

Make sure you start at the far end of the roof from your ladder and spray yourself out so that you don’t get trapped in a corner. That way, if you accidentally spray yourself or slip off the edge (which can happen!), you’ll land on something other than concrete below.

Inspect The Roof

Look for any problem spots, areas of peeling paint, or rotten patches of wood. If you find any defects that need work, do those first before cleaning the rest to avoid damaging your roof further and causing more problems. 

Avoid Direct Sunlight

If possible, try not to wash the roof when it is in direct sunlight because this will dry up all of the water leaving behind a dusty residue.

Begin With Detergent

When cleaning your roof, start with some water and detergent before getting the pressure washer involved. It will make it easier to clean off any stubborn dirt or grime while also preventing damage to the shingles of your roof.

Set a low PSI for the cleaning

Experts recommend pressure washers between 1200 and 1500 PSI to clean clay roof tiles. Depending on how filthy your roof is, you may need cleaning chemicals. In many situations, the water pressure is enough to clean the roof.

Be Gentle With The Pressure Washer Nozzle

You’ll want to use only the gentlest setting on your pressure washer. The lower the PSI (pounds per square inch), the less likely you will damage or warp your shingles.

The white nozzle delivers a strong spray with a 40-degree pattern. It’s the most widely used spray pattern, and it’s perfect for cleaning surfaces fast. This nozzle is also great for rinsing dirty dishes after using some chemical cleanser. It’s also fantastic for starting your roof cleaning project.

Don’t Get Too Close

Your goal is not to pry shingle pieces up with your powerful spray but instead get rid of all that built-up grime. Keep your nozzle a reasonable distance away from the roof and use only enough pressure to remove that dirt, not much more.

Use A Lower Setting

Your shingles are a little more delicate than they look. Some pressure washers can punch a hole right through the shingles at the highest settings, leaving them vulnerable to leaks and other problems. Make sure you use a lower setting so that your roof stays resilient against any damage. 

Don’t Spray Up, Spray Down

When you’re done, stand on the ground and spray down your roof with a gentle rain-style shower. If possible, use something to catch any runoff that may damage plants or patio furniture below.

To adjust the sprayer, move it, not the power setting

When you’re done with your roof, move the sprayer from one side to the next in gentle sweeps rather than dragging it along behind you. If you need more pressure near an obstacle like a vent or skylight, hold off until transparent and then use that section as your starting point for another sweep across the length of your roof.

Be extra careful when you’re on the ladder

Pressure washing your roof is a pretty intense activity, so you need to be extra careful while doing this kind of work. Make sure you have someone watching how steady your ladder is before climbing up. Stay clear from any power lines or other electrical hazards.

How To Pressure Wash A Roof: Easy Steps

Here are some steps to pressure wash your roof:

– Clean the house before pressure washing the roof.

– Put on rubber boots and gloves to protect yourself from chemicals during the cleaning process.

– Use detergent with water when washing a roof or deck surface to avoid damaging the wood, siding, stucco, etc.

– Use a suitable spray nozzle when pressure washes the roof.

– Determine how high you want to work on the ladder when cleaning your house’s exterior and how much of it you can reach comfortably from that height without straining or stretching.

– Take measurements for how long the garden hose should be if using one.

– Keep away from how hot the surfaces you’re working on with your power washer at all times. It can cause severe burns like those caused by scalding hot water coming out of a kitchen faucet or showerhead.

Tips: Check the weather forecast and make sure that it will not rain in the next few days.

What are the benefits of pressure washing my roof?

Improving the Life of Your Roof

The best reason to pressure wash a roof is to extend how long you have your roof before needing a replacement. When dirt and debris build up on the surface of shingles, they don’t work as well at protecting the home underneath them from extreme weather conditions like sun exposure or heavy rainfalls.

Increasing Your Property Value

Pressure washing a roof is also beneficial because it can increase how much you could get if the home were to sell. A clean house or apartment will be more attractive and eye-catching than one with dirt muddying up its exterior. So owners who pressure wash their roofs stand to see how much for which they can sell their houses, how much more quickly they’ll sell, and how long it will be before the roof needs to be replaced.

Reducing Energy Costs

The third benefit of pressure washing a roof is saving how much you pay for energy costs. Cleaner roofs will reflect more heat than dirty ones. It means there’s less chance the sun will heat the home underneath them and cause air conditioning bills to rise along with temperatures inside.

Pressure Washing Will Save You Money

There’s how much money to save by pressure washing a roof, and it can be substantial. The cleaner the house is when it goes on sale, the faster you will get your asking price or how much you can sell your homes.

Recommended Pressure Washers to Clean a Roof

Last update on 2022-01-13 / Affiliate links / Images from Amazon Product Advertising API

Last update on 2021-12-26 / Affiliate links / Images from Amazon Product Advertising API

Recommended Chemicals to Clean a Roof

Last update on 2021-12-26 / Affiliate links / Images from Amazon Product Advertising API

Last update on 2021-12-26 / Affiliate links / Images from Amazon Product Advertising API

Wrap Up – How To Pressure Wash A Roof

You can’t pressure wash your roof with a power washer. Instead, you should use this information to clean up the mess on top of your house safely and effectively!

If you want more tips like these, then let us know – we’re always happy to help homeowners get their houses looking spick-and-span again!

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Brett Tyler

Brett Tyler

I’m Brett Tyler, an entrepreneur, but more importantly (well, to me at least), a tool head. I’m passionate about all sorts of machines and how they work – it’s in my blood.

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