Dry rot in floor joists is more than just a timber problem – it’s a sign that your property may have sustained prolonged moisture exposure that needs urgent attention. For homeowners across Flintshire, especially in older properties or homes with poor subfloor ventilation, dry rot can go unnoticed until serious damage has occurred. Here’s how to spot the signs early and what you can do about it.
What is Dry Rot and Why is It Dangerous?
Dry rot is caused by a fungus called Serpula lacrymans, which thrives in damp, poorly ventilated areas – especially under suspended timber floors. Unlike wet rot, which stays near the source of moisture, dry rot spreads through timber and even across masonry in search of more wood to consume. This makes it particularly damaging if not identified and treated promptly.
Signs of Dry Rot in Floor Joists
If you’re concerned about your ground floor timbers, look out for these warning signs:
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A damp, musty smell rising from beneath the floorboards
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Crumbling or cracking timber that breaks away easily
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Orange, rust-coloured spores or a white cotton wool-like growth on timber surfaces
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Fruit body formations (mushroom-like growths)
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Distorted or shrinking timbers, particularly around skirting boards or floor edges
What Causes Dry Rot?
Most dry rot infestations in Flintshire homes are the result of:
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Poor subfloor ventilation
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Leaking pipes or guttering
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Bridged damp proof courses
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Condensation build-up in enclosed floor voids
Over time, the lack of airflow allows humidity to build up, creating the perfect conditions for fungal decay to take hold.
Professional Diagnosis and Treatment
If dry rot is suspected, professional inspection is essential. A qualified specialist will:
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Carry out moisture readings of affected timbers
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Identify the extent of the decay and how far it has spread
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Remove infected timber and apply targeted treatments such as fungicidal paste or gel
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Improve subfloor ventilation to prevent recurrence
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Replace affected timbers with pre-treated timber for long-term protection
Why Choose Weather Wise Solutions?
All our timber treatments are supported by PAM Ties and carried out by CPD-qualified damp specialists. As proud members of the Federation of Damp, we ensure all work is compliant, ethical, and designed to protect your property for the long term.
We don’t just treat symptoms – we investigate causes and implement lasting solutions tailored to your home.
Worried about your floor joists?
Book a Free Survey for your Home here.
Or Contact Us to speak with a qualified damp and timber expert today.