Dry Rot

Dry rot (Serpula lacrymans) is the most severe form of fungal decay that can affect a building’s structural integrity. It spreads unseen, penetrating deep into timber, masonry, and even through walls, weakening essential structural components. Unlike wet rot, which remains localised to moisture sources, dry rot can advance significantly by transporting moisture across surfaces. This ability allows it to thrive in timber far removed from the original source of dampness.

How to Identify Dry Rot

Early detection is crucial in preventing costly repairs. Signs of dry rot include:

✔ Shrunken, cracked, or darkened timber with a brittle texture.
✔ Distinctive musty, damp odour indicating fungal activity.
✔ Cotton wool-like fungal growth that spreads across surfaces.
✔ Rust-coloured fruiting bodies (sporophores) releasing spores into the air.
✔ Deep cuboidal cracking pattern in affected wood.
✔ Spore dust deposits, typically orange or reddish-brown, near outbreaks.

How Does Dry Rot Spread?

Dry rot spores are present in the air and only develop when conditions are favourable. The fungus requires:

• Moisture – Often from leaks, condensation, or poor ventilation.
• Timber – It primarily affects untreated wood with a moisture content of 20% or more.
• Lack of ventilation – Enclosed spaces, such as underfloor voids, roof spaces, and wall cavities, provide ideal conditions.

Once established, dry rot produces hyphae (fine fungal strands) that spread into affected timber, breaking it down and weakening its structure. Over time, it forms thick mycelial growth, which can extend over masonry and other materials in search of new timber to consume.

The Risks of Dry Rot

Unchecked dry rot can cause severe structural damage, making floors, beams, and walls unsafe. It can also:

• Compromise load-bearing structures, leading to costly repairs.
• Spread beyond timber, affecting masonry, plaster, and other building materials.
• Reduce property value and lead to extensive remedial work.

Professional Dry Rot Survey & Treatment

At Olympic Surveyors, our certified surveyors use advanced techniques to diagnose and treat dry rot effectively. Our process includes:

✔ Comprehensive Inspection – Identifying the extent of fungal spread using moisture meters, borescopes, and thermal imaging.
✔ Moisture Source Elimination – Finding and addressing leaks, rising damp, and condensation issues.
✔ Timber & Structural Assessment – Determining affected areas and necessary timber replacements.
✔ Targeted Fungicidal Treatments – Applying specialist fungicidal treatments to affected areas to kill remaining spores.
✔ Ventilation & Prevention Strategies – Installing proper airflow systems to prevent recurrence.
✔ Masonry & Plaster Treatment – Treating walls and other non-timber surfaces affected by fungal growth.

Why Choose Olympic Surveyors?

• Certified Surveyors specialising in timber preservation and dry rot treatment.
• Multi-award-winning PCA members, regulated by RICS.
• Scientific, non-destructive diagnostic methods to minimise property disruption.
• Tailored solutions ensuring long-term protection against dry rot.

Book Your Dry Rot Survey Today

If you suspect dry rot in your property, contact Olympic Surveyors for a professional survey. Early detection and treatment are essential to protecting your home or building.