2.2. The temperature as growth factors for the dry rot
Cut down timber destroying fungi develop minimally in a temperature-area of this with approximately 2...5 ºC and lies at most with 35...40 ºC. Within this area, every fungus-type has a certain optimum. The higher growth-speed is with it in the higher area. In the following table, selected wood-destructive fungi are compared.
1, as well as (after Cartwright and Findlay) Schmidt 1994 1-10 mm, Jennings and Bravery 1991 1,5 - 9 mm
It can be inferred from this small survey that the temperature-height has an essential influence on the growth of the respective fungus-type. (To see Temperature-influx on the growth-speed.) The temperature in a house and apartment respectively lies with 20°C. Here, the real dry rot has opposite the other types additionally more favorable growth-conditions. At component parts, where higher temperatures are available in context of the humidity, the white pore-sponge grows sooner. The Balkenblättling (Gloephyllum trabeum) has the same growth-increase already with 20°C, like the real dry rot and lies with its optimum with almost the double. Therefore in an area where the real dry rot (with about). 25°C, already its growth puts in. (Heeding is, if the space-temperature 27°C amounts, the wall-surface can a temperature of 20°C and is even less available in the wall-inside. The fungus-mycelium is in the wall-inside. It grows especially well in this case.) The real dry rot is not more dangerous than the other wood-destructive fungi from the matter. It depends on the respective influential factors altogether. The highest here named growth rate is reached by a white-rottenness-fungus, the shaggier work period-mushroom, it at the living tree occurs.
If the temperature-area becomes over, or under-strode, so heat, respectively cold-stiffness one, that leads to the biological death over longer time, places itself.
Laboruntesuchungen in the BAM-Berlin-Dahlem yielded that the real dry rot in the dry wood in the dry-stiffness, with a constant climate, as follows survived:
It will determine that weighed the transfer into the dry-stiffness and must take place very slowly, so that the fungus doesn't perish irreversible in the wood. At the building, climatic changes constantly prevail, so that can be gone out from a shorter stiffness-FTAM process. (Ingo Müller 1999)
Advantage is taken for alternative fight-methods of this fact with help of the law cases with hot air. In Denmark, it is a recognized fight-method. In Germany, this method finds application admissible above all only at construction-monuments as flanking measure. The problem exists here that the massive stonework must become with a high heat-capacity aufgeheizt, for example. The consumption at Heizenergie and the smoke-gas-output must be in a realistic proportion to the conventional fight-method in accordance with DIN 68800 part in 4. An appliance requires for the production of 80.000 kcals / h circa 7,8 kg fuel oil. At an operation of 2 appliances over 4 h. originate so about. 700 m3 smoke-vapors with 80 m3 C02 36 liters CO, 0,3 -0,6 kg of sulfur and 200 to 400 l sulfur-gases, (basis-numbers for Uwe Sallmann) the fight-time for it dry rot is with 3 - 6 h (Dr. Unger).
As well, no statement about the successful destroy of the hyphas can be met in the wood-inside. With the SELAREX-law cases is brought into the great commissure-heads and great commissures respectively in a certain indemnification of rods to heating and according to the wood over a certain time heat.
From Finland, a special thermic treatment of the wood comes which is marked thermo-wood under the names. Already from the twenties, first references about this law case come. Beside the other favorable qualities, this wood should be attacked by the dry rot no more. (Sanni Rytke 1999). However, the changed static claims are to be heeded. With Günter Langendorf, the possibility of destroying of fungus-mycelium is mentioned in the wood. The heat-death of the mycelium comes after Liese 1931 for different fungus-types:
The spores at the surface must a temperature of 100°C over 4 hours or 80°C over 6 h. is abandoned. (Dr.. Unger 1996, in the biotechnology becomes to the sterilizing the facility, Fermentor tanks etc..) essentially higher temperatures uses.
Another alternative shows the desiccation-appliance on microwave-basis. By the "heating" up the stonework, the Myzel is also warmed up simultaneously. The albumin-structure becomes so destroyed. In like wide here a general fight takes place, is not known. However, no long-time-protection should be available through this law case alone. In combination with the other fight-methods, meaningful solutions can be achieved exactly in the monument-protection here surely.
A. Biology the holzzerst.
Fungi and insects
B. Serpula lacrimans
2. Growth factors
2.3. Influx light / air
2.4. Function of the mycelium
2.5. Characteristics mycelium
2.6. Cytologische processes
3. Health endangering
4. dry rot types
6. Reorganization measures
8. remediation own-service
- Bibliographical review
- Statistics cases of damage
- Duty of notification
Roof-projectile-development, molds and moist brickwork
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| eBooks | 10/2005
building material Construction-physics Preservation of structures Expertise Wood Immovable Residential-climate