Block Spots On Pressure Treated Wood Siding

Cabot semi solid deck siding stains penetrate so deep into the wood.

Block spots on pressure treated wood siding.

Treated lumber is protected from many things including mold and mildew but that only means it will not penetrate the surface quickly. Cedar siding looks beautiful when it s fresh and new but as the years go on it may become grungy dark and neglected. Over a long period of time if the mold is left on the treated lumber it will eventually work its way into the grain of the wood. Don t go any higher than 1500 psi and use either a 25 or a 40 degree tip.

Sealer is not going to help that. Mold and mildew grow when the wood is wet and doesn t get a chance to dry often. If you re using a pressure washer be careful not to damage the wood. I don t know what the black spots are it could just be mildew or mold growing.

Dip a scrub brush into the solution and spread it over the deck. Thoroughly clean the siding. Bleach is one of the best solutions for removing black mold and mildew spots on your wooden decking. When the lumber weathers it turns a bad color it starts to shrink and starts to get cracks in it.

Cabot semi solid deck siding stains. Though black mold is undesirable on rough sawn lumber it is neither particularly dangerous or difficult to remove in most cases. What a sealer does is helps that pressure treated lumber from weathering. Mix 1 cup of bleach into 1 gallon of water.

If the cleaning is successful continue with the rest of the siding. With a garden hose and nozzle spray one section of the stained wood siding from the top down. If extra force is needed gently spray the siding with a pressure washer. At the first sign of mold flat black or green spots or mildew grayish white powdery looking splotches look for a cleaner containing mildewcide available in a premixed formula or as liquid.

Besides it highlights the natural beauty in the wood s grain and texture with a distinct. Use a quality wood cleaner or if you have access to one a pressure washer. Depending on the wood and the treatment this could take anywhere from weeks to. Black mold can be an irritant for people with certain allergies and people with severe allergies can be made very sick by being in close proximity to black mold spores.

The side of the house with the least sun exposure can be the worst spot with.