Consulting engineers Peter Rauch

The real dry rot (Serpula lacrimans), its life-basis and other wood-destructive fungi, Peter Rauch -   (Automatic translation from hs052.html)

5.2. Macroscopic fungus-provision

A macroscopic examination of the fungus-type requires a professional sampling and the judgment of the damage-surroundings. All characteristics, as the location, factory - respectively construction-materials, climate-conditions and also the time-elements, of the affection, to grasp completely, is. It is as many as possible distinctive features to determine. The fungus-provision never should be supported only by a characteristic.
Wood and fungus-tests, that are not taken expertly, don't make any sure evaluation of the damage possible. In the practice, usually simultaneously different wood-destructive fungi occur. The fungus, that finds optimal life-conditions presently, dominates on that occasion.

Some fungi form a fine mycelium in the and also on the wood as well as at the adjacent fill or at the stonework. The fruit-bodies, that can look quite different even with the same type, for example darkness-fruit-form, are another difference.
The different fungi prefer certain wood-types.

There are also some simple physical checkup-methods:

  • Healthy wood has a light sound, sick sounds dull.
  • Pilzbefallenes wood picks up fast waters (hygroscopic). With sleek wood, one can recognize the difference so.
  • The pressure-proof-ness of attacked wood is lower. This leaves itself through stabbing with a knife, screw-turners or through tests of drilling (Bohrwiderstandsprobe) determines.
  • If the wood with ammonia becomes, Sodaleach or lunar caustic drenched, so the attacked wood changes color differently than the healthy one.
  • There is a series of wood-destructive fungi, that destroy the wood-inside of the great commissure to first. From outside, no damages are recognizable. If the wood-surface was equipped with a fungus-unfavorable wood-preventative, so the affection can also take place through not typical kernel-rottenness-fungi, into which these of the unprotected forehead-plain grow.

    • Form brown-rottenness at a blanket-great commissure
    A typical rottenness-picture of a blanket-great commissure, the affection takes place from the forehead-plain from.

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    Content
    A. Biology the holzzerst.
        Fungi and insects
    B. Serpula lacrimans
        (Real house-sponge)
    1. Damage-picture
    2. Growth factors
    2.1. Humidity
    2.2. Temperature
    2.3. Influx light / air
    2.4. Function of the mycelium
    2.5. Characteristics mycelium
    2.6. Cytologische processes
    2.7. Spores
    2.8. Environment-influxes
    3. Health endangering
    4. dry rot types
    5. Regulation-methods
    5.1. Broadly
    5.2. Macroscopic
    5.3. Microscopic
    6. Reorganization measures
    7. Damage-areas
    8. remediation own-service
    - Bibliographical review
    - Statistics cases of damage
    - Duty of notification
    Books / Download

    Book roof-projectile
    Roof-projectile-development, molds and moist brickwork
    Consulting engineers Peter Rauch

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     building material Construction-physics Preservation of structures Expertise Wood Immovable Residential-climate
    Consulting engineers, work-formation and construction-biology Peter Rauch - Leipzig -