Dry Rot

Diagnosing the source of any moisture is critical to curing dry rot. Our team of qualified timber surveyors will diagnose the cause and recommend the best solution for curing dry rot.

Due to the nature of dry rot, it's important to open up or remove the floors and plaster to investgate the extend of the outbreak before any remedial work is carried out.

Under the supervision of a qualified MacLennan remedial surveyor, the full extend of the dry rot needs to be ascertained, drawn and mapped out without causing unnecessary destruction to unaffected areas and finishes that may be unnecessay or of historical importance.

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    - Causing Floorboards To Crumble
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    - Causing joist To Crumble
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    - Effects Wood And Spreads Through Brickwork
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    - Dry Rot ( Sporophore ) Spreading Under Floor
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MacLennan have been experts in designing, installing and guaranteeing systems for over 30 years.

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If an area of timber or plaster is affected by dry rot and is of historical importance, then every effort should be made to conserve it by drying, isolating and, if necessary, treating with Boron.

The area or building element should then be monitored either visually or by using dry rot sensors and damp sensors that are available through MacLennan. Isolation of all timbers from damp masonry is essential as a long-term cure for the dry rot. Treatment with Boron can be carried out to help prevent further outbreaks.

As a masonry biocide, B10 will effectively eradicate spores and fungal growth in the wall. B20 will work very effectively on damp masonry and will remain in dry wood as a defence should it become damp, at which point the B20 would move into the wood to provide further protection. All new timber used in repairs should be pre-treated with a wood preservative.

Detailed guidance on the treatment required for various timber components is given in the British Standard BS5268: Part 5, which deals specifically with structural timber, and BS5589 which covers a wider range of uses. Guidance is also given on the use of naturally durable timbers (see also Digest 429 published by the Building Research Establishment Ltd).

Find out more about Timber Treatments

Why should I work with MacLennan?


We Design, supply and install. There's no split responsibility with MacLennan.


MacLennan live and breathe waterproofing, have a look at one of our free CPD seminars and find out!


MacLennan has the most comprehensive guarantees and insurances in the industry.

 What are the causes of Dry rot?


Dry rot spores are common and will be found in most homes. When these spores are settled on an ideal environment due to moisture and timber to feed on, they grow!

Poor Ventilation

In areas of poor ventilation, moisture builds up. Combined with spores and a suitable food source such as timber, this creates a perfect environment for dry rot.


Dry rot loves timber, when it's got its ideal food source, moisture and oxygen, the fungal growth can then flourish.

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