The answer to 'why is my deck erosion' is that deck erosion is a common issue caused by a variety of factors, including weather, soil conditions, and improper installation. Deck erosion can lead to structural instability, safety hazards, and an unsightly appearance.
Some common causes of deck erosion include water damage from rain, snow, or sprinklers; soil erosion around the deck footings; and poor drainage or grading around the deck. Over time, these factors can cause the deck to sag, shift, or develop cracks and gaps in the surface.