Are surface molds or mildew fungi capable of weakening wood?

The ability of surface molds or mildew fungi to affect wood primarily involves their role in altering the wood's appearance rather than causing significant structural damage. Surface molds and mildews typically grow on the wood's surface and may discolor it, leading to an unsightly appearance, but they do not penetrate deeply enough to compromise the integrity of the wood itself. This means that while they can create surface issues like staining, they do not weaken the wood's structural properties significantly.

In contrast, other fungi, such as wood-decaying fungi, can actually break down the cellulose and lignin in the wood, leading to structural weaknesses. However, surface molds and mildews do not have this capability, as their growth is largely limited to the exterior. Understanding this distinction is crucial for identifying potential issues in wood structures and knowing when professional treatment may be necessary.