How to Remove Mold From Your Shed Roof

What You'll Need
Chlorine bleach
Tri sodium phosphate
Spray bottle
Copper sulphate
Water and hose

Mold on a shed roof not only looks ugly, it can also damage the shingles so you need to replace them sooner than might otherwise be necessary. It’s not difficult to remove mold from the shed roof. Once it’s off you also need to ensure it doesn’t return.

Step 1 - Protecting the Area

As you’ll be using materials that can damage plants, it’s important to protect the vegetation around the shed as much as possible. The best way to do this is by hosing the plants down with cold water to prevent any of the materials sticking and causing permanent harm. You’ll be working on the shed roof so you need to have a ladder against the shed with its feet firmly and squarely planted on the ground.

Step 2 - Bleach

Make a solution that’s 3 parts water to 1 part chlorine bleach. If there’s a great deal of mold you should also add some tri-sodium phosphate, which is a very powerful cleaner. You’ll only need to add a small amount.

Decant the mixture into a spray bottle and apply to the entire roof. Allow the mixture to sit on the roof for 15 minutes, then hose clean with water. After this, inspect the roof for any traces of remaining mold. If you find some, repeat the entire process. Rinse again to complete the application.

Step 3 - Copper Sulphate

Put 12 ounces of copper sulphate crystals in 1 gallon of warm water and mix thoroughly. Apply the solution to the roof. You’ll be able to see it working as the mold and mildew on the roof will turn brown. This might take a few minutes.

After this, take your broom and scrub the roof to remove the mold. It should come off easily. Weary heavy footgear and complete the process by rinsing off the roof with cold water. A single application should be adequate to remove all the mold from the shed roof. If any is left, put more of the solution on it and sweep it off after waiting a few minutes.

Step 4 - Mold Prevention

Having eliminated the mold, the next step is to ensure it can’t return. Using shingles that contain copper will discourage mold and mildew from forming, as the copper will react with rainwater to kill mold. You can also install a layer of zinc flashing just below the ridge of the shed roof as zinc will prevent mold forming when it interacts with rain water. Both of these are good solutions. There are also products available for purchase that can be sprayed on annually and prevent mold from forming.

Also look at the area surrounding the shed roof. Cut down any overhanging branches as they will stop sunlight reaching the roof. Sunlight and good air circulation will stop both mold and mildew from forming. Taking some of these steps will help keep the shed roof mold free.