Damage caused by dry rot

Wood-decaying fungi

The real dry rot

The real dry rot is the most dangerous and most difficult fungus to fight in buildings. It is able to attack wood with a wood humidity in the fiber saturation area and to moisten dry wood for the further infestation by the transport of water. It grows through brickwork and other inorganic materials and attacks adjacent wooden components.

Dry rot

(Serpula lacrymans (Wulf.) Fr. Schroet.)) initially cotton wool-like, white, later dirty grey and lobed, possibly with yellow or red spots. The mycelium-cushions detach easily from the surface. Formation of up to 6 mm thick mycelium strands, which break when dry with a clear crack.

Fruiting body

Wrinkled yellow to reddish brown with white growth edge. 1 - 2 cm thick. Can be easily removed from the surface when young. Forms abundant brown spores, which are often scattered throughout the room. Old fruiting bodies turn black-brown.

Infestation pattern

Shrinkage cracks in the wood with often coarse cubes and browning. Cracks in the varnish, as well as warping and bulging; primarily coniferous wood is attacked, but hardwoods are also attacked.


Determining of the fungal species

In the case of a fungal infestation, it must first be determined what type of fungus is involved, because the type and extent of the remediation measures depend on this. It is assumed that a qualified expert has carried out an investigation into the type and extent of infestation and thus the need for a control measure. If there is a possibility of fungal strands growing through the masonry into adjacent rooms, these must also be examined for infestation. The real dry rot must be determined without any doubt. If this cannot be done microscopically, laboratory tests must be carried out. Careful investigations are necessary regarding the cause of the increased humidity of brickwork and wood. The source of moisture must be eliminated. It must be ensured that no new moisture penetration occurs.

Combating dry rot

  • Elimination of causes
  • Treatment of the wood
  • Infestation of the masonry
  • Surface treatment
  • Application of the sponge blocking agent
  • Borehole treatment
  • Borehole impregnation
  • Borehole pressure impregnation
  • Rework

* Use biocidal products carefully. Always read the label and product information before use.

Damage caused by dry rot

2 products found


Article No. 210005

Liquid preservative concentrate for preventing dry rot in masonry work