Stumbled upon this article because you saw your patio turning black?
Well, you must be glad to know that you are not the only one.
The appearance of black spots on your patio slabs has always been a problem for people.
But do you really know how it all starts? Is it common or not? How to remove it?
Let this article be your source.
What Causes Patio To Turn Black?
There are multiple factors why your patio might turn black or start growing black spots on it.
Lichens are the most common reason you see black spots on your patio slab surface.
It’s a composite organism that is developed from algae and fungi.
It grows in the presence of moisture and shaded concrete surfaces like patio slabs.
Another reason you can see them growing on your slabs is that the wind easily blows them onto your patio slabs.
There, they can easily establish themselves with their root-like structures and firm themselves onto the surface.
Lichens are not the only reason your patio may turn black.
It can simply be because of water.
Water can quickly cause discoloration of your patio slabs, especially if there is drainage issue or malfunction in the lawn irrigation system, making water spill onto your patio.
3. 3 M’s – Mold, Mildew, and Moss
Do you know about the three M’s that nobody likes? Mold, Mildew, and Moss.
Though nobody likes it, it is still found quite a lot in places near you.
These are the substances that are easily grown onto concrete surfaces with deep level roots.
They can turn your patio slabs green or black.
4. Poor Workmanship
Another reason your patio slab is turning black can be the result of poor workmanship.
If the slabs aren’t installed properly or cleaned properly afterward, they can be discolored due to poor material.
Or the adhesives stains can turn darker when they haven’t been cleaned.
This is a rare cause to exist, but it does exist.
Is this common? Patios turning black are very common.
It solely depends on how you maintain it and how you install it.
As discussed above, there are multiple reasons for your patio to turn black, and similarly, there are various reasons for your patio to get clean as well.
Several professional services provide this, or you can go DIY.
What To Do When My Patio Turns Black?
If your patio has turned black, then there are multiple maintenance procedures to carry out to protect your patio.
1. Power Wash The Patio
The foremost thing you have to do to get rid of spots is to create a clean slab to work with.
You have to power wash the whole patio, remove the growing weeds and scrape off the moss, algae, and fungus with a screwdriver with a flat head.
Mostly, the power wash itself is enough to remove the black color of the patio, but if it doesn’t work out, then there are more steps to follow.
2. Pour Sand In The Patio Slab Joints
Another trick that can be worked easily is to apply a thin layer of polymeric sand in between the patios slab joints.
Make sure to clean the sand from the top, so it does not leave stains.
Also, make it gets down right into the joints completely.
The reason behind the polymeric sand is to hinder the weed growth and prevent the bugs and other insects from making their homes in between the stones.
3. Kill Weeds With Vinegar Solution
Strong chemicals can destroy your surroundings, so your safe option is to opt for a vinegar solution.
Use half a cup of vinegar and a half cup of borax, or add one teaspoon of vinegar to a spray bottle along with one teaspoon of dishwashing soap.
Spray it on the slabs as it will prevent the weeds from growing along with the spreading of moss, mold, and mildew.
So here’s the thing, it’s very common for patio slabs to get stained and black, but it’s not hard to get it back in shape.
So, the next time you saw this happening, be considerate.
Keep an eye on the cleanliness of your patio slabs.
Dry out the slabs regularly and make sure there is a proper ventilation system.
This might mean to trim the overgrown shrubs and trees, placing the patio furniture in some different direction or place or creating a proper pathway for drainage to avoid any kind of moisture like pooling water.