Fan post!
February 13, 2010, 21:48
Filed under: In English | Tags: , , , , , , , , ,

The following picture was submitted to us by an avid fan, who understands our rabbit minds very well.

Two rabbits logging - first steps and saw

We will be working under cameras which will be connected to the Internet 24/7.

ProVillage in the Google SketchUp Warehouse

Some of the models for the project are now viewable in the Google 3D Warehouse.

This is only the beginning. I will try to upload one picture per week mainly on the topics which we have covered and will be covering in our blog in the future. Things have been progressing at such a pace that we have to collect our marbles and put them into some reasonable order again.

– Tero


ECO-BUILDING – PART 3: Strawbales are outstanding as insulation!

The construction of strawbale homes has grown enormously around the world. The reason for this is the cost-effectiveness of the building material, and that the normal supporting structures and the clay-plastered straw bales replace many other materials, such as tile or wood cladding, wind-proof boards, insulation, plastics and decorative boards.

A large straw bale house - Wikipedia

Even large houses, such as exhibition halls of thousands of square meters, are being built using straw bales.


From our three separate ’ProVillage’ -documents you can get a relatively clear idea about our project:

The documents can be found both in Finnish and in English.

Downloading might take some time, because the files have an approximate of 130 images.



Here a library has been constructed using straw bales.  The wall support structures have been crafted for the windows. After this the walls have been plastered with a clay and sand mixture to leave it to a distinctive light colour.


The supporting structures are made in the same fashion as in the usual building of a house. Here a window-area has been prepared for the application of the external render.The window benches and the window frames are connected firmly together to the supporting structure. In the meantime, the ‘packages’ of straw are tightened and ‘barbered’ to a uniform surface.


The window benches and the window frames are connected firmly together to the supporting structure. In the meantime, the ‘packages’ of straw are tightened and ‘barbered’ to a uniform surface.


The insulation capability of a straw bale structure

The Finnish thermal insulation requirements will tighten remarkably by the year 2010.

”The U-value (or U-factor), more correctly called the overall heat transfer coefficient, describes how well a building element conducts heat. It measures the rate of heat transfer through a building element over a given area, under standardized conditions. The usual standard is at a temperature gradient of 24 C°, at 50% humidity with no wind (a smaller U-value is better). U is the inverse of R with SI units of W/(m²•K)”


The U-value (previously known as the K-value) in part C3 of the collection of building regulations. —– The U-value is to indicate the thermal insulation of various structures in a construction.

The smaller the U-value, the better the insulative capabilities of the material.



“The term passive house (Passivhaus in German) refers to the rigorous, voluntary, Passivhaus standard for energy efficiency in buildings. It results in ultra-low energy buildings that require little energy for space heating or cooling”


All or nearly all of the heat energy needed  is obtained from solar energy and the heat generated from the living in the house.

A passive house does not have an actual heating system. The outer shell of the house has to be well insulated and tight.



The pictures above and below have been taken from a guide book which is published by Amazonails, which also can be downloaded in PDF-format from:


The following is a table of summary:

The tightening demands on external insulation of various building materials

building regs


The situation is such that if one was to use 45 cm of mineral wool on a wall, that would also fall into the requirements of a passive house, but at the same time would be very expensive.

So it can be deducted that in reality strawbales are the best and most cheapest insulation material, falling greatly below the norms with its values even under tightened circumstances.


Here you can find a lot of literature in English on the topic:

Pictures : and

An information package can also be found there which can be distributed freely.

Videos can be seen here =>

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