What is the Difference Between Wet Rot and Dry Rot?

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The main differences between wet rot and dry rot are the type of fungi causing the decay, the moisture content required for growth, and the severity of the damage they cause. Here are the key differences:

  1. Type of Fungi: Wet rot is a general term for several fungal species, the most common being Coniophora Puteana, also known as cellar fungus. There are many different types of wet rot fungi, while there is only one dry rot fungus.
  2. Moisture Content: Wet rot fungus requires a higher moisture content of around 50% or more to grow, whereas dry rot fungus can grow at a lower moisture content.
  3. Severity of Damage: Dry rot is the most serious form of fungus decay in a building, spreading onto and destroying much of the timber. Wet rot, on the other hand, is less destructive and confined to the area where timber becomes and stays wet.
  4. Types of Wet Rot: There are two common types of wet rot: white rot and brown rot. White rot occurs when the fungus digests the lignin, giving the timber a soft, spongy feel when touched. Brown rot takes on a darker appearance than white rot and can look closely matched to the affected timber color.

To treat wet rot or dry rot, it is essential to identify the correct fungi affecting your property and take appropriate measures to eradicate the issue. If you suspect either wet or dry rot in your property, it is advised to consult a professional for advice and treatment.

Comparative Table: Wet Rot vs Dry Rot

Wet rot and dry rot are two common forms of fungal decay that can affect structural timber in buildings. They require different moisture conditions and can cause varying degrees of damage. Here is a table summarizing the differences between wet rot and dry rot:

Factor Wet Rot Dry Rot
Moisture Content Requires a higher moisture content (around 50%) Does not require a higher moisture content
Fungal Species Several species, most common being Coniophora puteana Serpula lacrymans
Types White rot and brown rot Not applicable
Appearance Whitish or brownish color, soft and spongy feel Whitish color, brittle appearance
Structural Damage Weakens timbers, can lead to major structural problems if left untreated Causes significant damage, often requiring extensive repairs
Treatment Removing the source of moisture, treating affected timbers Removing affected timbers, treating surrounding areas, changing environmental conditions
Spread Confined to the area where timber is wet, cannot spread through masonry Can spread over dry surfaces, even chemically treated ones if dried out

Identifying the difference between wet rot and dry rot is essential for proper treatment and prevention of further damage to the affected property.