What PSI Is Safe for Pressure Washing Siding and Decks?
If you are a homeowner in Wilmington or Raleigh, NC, you know that cleaning your home’s siding and deck is part of proper maintenance. For most people, pressure washing is the easiest way to keep a deck and siding clean. The problem is that if you use the wrong PSI, you may cause serious damage.
So, before pressure washing your Wilmington or Raleigh property, it is important to know how pressure washers work. Consider the following:
Pressure Washing and PSI
PSI is the abbreviation for pounds per square inch. PSI measures the force of the water stream as it hits the surface you intend to clean. A higher PSI can indeed remove tough dirt more effectively. But when the PSI is very forceful, it can cause damage.
This is why it’s important to start from a low level when setting your pressure washer PSI. Test the pressure on a small area, then increase the pressure gradually if needed.
Safe PSI Levels for Siding
If you are wondering how much PSI to pressure-wash vinyl siding, you can safely clean vinyl with a PSI of up to 2,000. Some vinyl siding can withstand up to 3,000 PSI, especially if you use a gas pressure washer. However, to stay on the safe side, 2,000 PSI is advised.
Aluminum or wood siding should be cleaned with a pressure of 1,200 to 1,500 PSI. If you have brick or stone siding, use a PSI of 800 or lower. You can increase the pressure back to 1,200 to 1,500 for stucco.
If you are unsure of the pressure washer PSI for the siding in your home, consider asking a professional for assistance.
Safe PSI Levels for Decks
If you have a wood deck made of softwood or hardwood, you should set your pressure washer between 500 and 1,200 PSI. A 25- or 30-degree washer nozzle can handle 1,000 to 1,200 PSI. Keep in mind that pressure that’s too high can damage wood and even splinter it.
It’s important to note that there are some variables to consider when determining the PSI for pressure washing your deck. This is where professional services come in handy.
More Tips for Safely Cleaning Your Deck and Siding
Consider the following tips before pressure washing your home’s siding or deck in North Carolina.
Start with low pressure and remember to test it on the surface first. Even if you know the recommended PSI, you should always start from the lowest setting. Test a spot that is not very visible. This will allow you to see how the surface reacts without risking too much damage. If the pressure is too low, increase it gradually until you find the setting that cleans properly without damaging the surface.
Choose the right nozzle angle. Your pressure washer’s nozzle controls the width and force of the water spray. Ideally, you want a wider angle of 25° or 40° for decks and siding. This angle allows the water to spread out more, reducing the risk of damage. Narrower nozzle angles, like 15°, work well for concrete driveways. Again, if you are unsure about the angle, always start wide. You can gradually tighten up the angle as needed.
Stand at a safe distance. It is important not to hold the pressure washer wand too close to the siding or deck surface. If the wand is too close, the water pressure can quickly cause damage. Keep it at least 1-3 feet away. Move the wand smoothly in overlapping passes. Use the same kind of movement as you would when you mow the lawn to ensure your surface is cleaned evenly.
Soft washing is best for delicate surfaces. If you have softer materials to clean, such as cedar or stucco, it is better to opt for soft washing. Combining soft washing with a mild detergent can effectively clean surfaces. This is also a good way to remove algae and mildew.
Most decks and siding can be cleaned safely using a pressure washer, but some surfaces will not be able to withstand pressure washing. Examples are painted surfaces and windows. The same applies to bricks, as the mortar in between can erode.
If you are in doubt whether your home’s surfaces should be pressure-washed, get a professional to guide you.
Let the Pros Handle Your Pressure Washing
Pressure washing seems like a simple enough task for anyone to execute. However, if you get the PSI wrong or use too much force on a delicate surface, you will do more harm than good. It is always a good idea to consult a professional who can help you clean your deck, siding, and other surfaces safely.
Trust Anderson Painting NC With Your Deck and Siding Cleaning Needs
If you need your deck and siding cleaned but are unsure about how to pressure-wash it, Anderson Painting can help. Our expert team can bring your home’s exterior back to life, damage-free. Contact Anderson Painting today for a free estimate.
