friedrich27
2013-12-02 08:42:20
- #1
Well, if you ask me so nicely, then once again:
- The FRG is about 35 million hectares in size.
- Nearly one third of the area is forested.
- We have a forest area of 11.1 million hectares.
- In our forest structure, about 10 fm (fm corresponds to 1 m³) grow annually.
- How precarious the wood shortage apparently is shows that we could significantly increase this growth with fast-growing tree species (e.g. Douglas fir),
but we do the opposite. For a long time, beech, a very slow-growing wood species for which we actually have no sensible use in such quantities, has been preferentially planted.
Therefore, about 70% of the beech timber harvested is burned. Certainly a more sensible use than building houses with it.
- To build a single-family house entirely out of wood (example: cross-laminated timber for walls, ceilings, roof, insulation completely made of wood fiber and
the weather protection also from wood components), we need about 130 m³ of wood mass.
- I incorrectly equate m³ with fm for simplification. Incorrect because 100% yield is not achieved in sawn timber production but for one m³ of wood fiber insulation, no 1 fm is required.
- That means we get an annual wood growth of 110 million fm. About 70% of that is harvested for wood use. So about 77 million fm per year are available in the FRG. Thus, from this, if we used the entire wood growth exclusively for houses (single- and two-family houses), which would be built purely from wood, we could build almost 600,000 houses.
- But last year we had only about 120,000 building permits. Of those, about 15% were built predominantly with wood. However, by far the largest number of these were built in HRB with mineral fiber or EPS insulation. The wood consumption for such houses is then naturally much lower than in my example.
Now I wonder which wood use is more sensible than building high-quality, ecological houses from it.
I also wonder where the writer gets the knowledge that the very important raw material wood is running out.
One small note:
Our forest areas are not getting smaller but increase year by year.
Knowing nothing doesn’t matter. But maybe it is then sensible not to formulate this as a claim but as a question. Because there are no stupid questions.
Regards Friedrich.
- The FRG is about 35 million hectares in size.
- Nearly one third of the area is forested.
- We have a forest area of 11.1 million hectares.
- In our forest structure, about 10 fm (fm corresponds to 1 m³) grow annually.
- How precarious the wood shortage apparently is shows that we could significantly increase this growth with fast-growing tree species (e.g. Douglas fir),
but we do the opposite. For a long time, beech, a very slow-growing wood species for which we actually have no sensible use in such quantities, has been preferentially planted.
Therefore, about 70% of the beech timber harvested is burned. Certainly a more sensible use than building houses with it.
- To build a single-family house entirely out of wood (example: cross-laminated timber for walls, ceilings, roof, insulation completely made of wood fiber and
the weather protection also from wood components), we need about 130 m³ of wood mass.
- I incorrectly equate m³ with fm for simplification. Incorrect because 100% yield is not achieved in sawn timber production but for one m³ of wood fiber insulation, no 1 fm is required.
- That means we get an annual wood growth of 110 million fm. About 70% of that is harvested for wood use. So about 77 million fm per year are available in the FRG. Thus, from this, if we used the entire wood growth exclusively for houses (single- and two-family houses), which would be built purely from wood, we could build almost 600,000 houses.
- But last year we had only about 120,000 building permits. Of those, about 15% were built predominantly with wood. However, by far the largest number of these were built in HRB with mineral fiber or EPS insulation. The wood consumption for such houses is then naturally much lower than in my example.
Now I wonder which wood use is more sensible than building high-quality, ecological houses from it.
I also wonder where the writer gets the knowledge that the very important raw material wood is running out.
One small note:
Our forest areas are not getting smaller but increase year by year.
Knowing nothing doesn’t matter. But maybe it is then sensible not to formulate this as a claim but as a question. Because there are no stupid questions.
Regards Friedrich.