Design of timber floors to prevent decay
Digest 364
Document Status
Current
Supplement
Core Supplement
Series
Digest
Abstract
Timber is an organic material which, under damp conditions, may be at risk of decay by wood rotting fungi. Different timber species have different degrees of natural resistance to fungal decay but the softwood species most commonly used in modern building construction all have a low natural resistance to decay. It is important, therefore, that the moisture content in service remains below the critical threshold for decay. To be immune from attack, the moisture content of timber must be maintained below about 22%. Occasional, brief periods of superficial wetting, due say to condensation, are unlikely to allow initiation of decay. This threshold value applies to decay by the dry rot fungus Serpula lacrymans as well as the wet rot types of decay which result from attack by a number of other fungi.
History
Replaces - BRE Digest 18.
Subjects
- Floors/balconies/stairs
- Special subject areas
- Damage/deterioration/corrosion
- Rot
- Building structure
- Timber floors
Publisher History
BRE is a building science centre that generates new knowledge through research. This is used to create products, tools and standards that drive positive change across the built environment. BRE helps its government and private sector clients meet the significant environmental, social and economic challenges they face in delivering homes, buildings and communities. BRE is owned by the BRE Trust, a registered charity. The Trust uses the profits made by the BRE companies to fund research and education that advances knowledge of the built environment.
Information
NBS
NBS has produced specification systems and information products for construction industry professionals for more than 40 years. The National Building Specification is the recognised UK national standard and is used by over 5,000 organisations. NBS is part of RIBA Enterprises Ltd.
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