The thermal U-value of a green-built conventionally framed home is better than the values in solid log homes. In the green-built conventionally framed home, the U-value is 0,21 and for even a massive log wall it is 0,55. However, as a log home stays warm or cool based more on thermal mass principals, comparing just U-values is not an accurate comparison method.
The thermal values in a Green-Built Conventionally Framed Home are also better than in an Insulated Log Home.
In a so called Green-Built Home compared to Standard Conventionally Built Home, the wall structure (plastic + fiberglass) is replaced with natural building mnaterials such as cellulose. In other words in the Green-Built Home the wall structure has no plastic elements.
Pre-cut technique indicates that the wooden parts are cut to the fixed length at the factory. The wooden parts are assembled at the building site. This enables the customer to see how the house is built.
The wall can settle 1 cm per one meter on the wall. The settling will occur during the first two years.
A round log wall will settle a lot more in relation to a laminated log wall. A round log wall will settle about 2 cm per meter on the wall.
A spruce log is less dense and it has less knots than a pine log. A spruce log does not darken while the time passes as much as pine log. The humidity resistance of a spruce log is better, meaning that the wood constituent of a spruce is roughly the same as the heart of a pine log.
A spruce log is slightly less expensive than a pine log. (Spruce is used less which has an effect on the market price).
It means that the basic delivery (wood parts delivery) includes the delivery of wooden parts in the house, including windows and doors. (downstairs floors NOT included).
Honkatalot makes so called frame constructions for Log Homes and Green-Built Conventionally Framed Homes. Honkatalot has a large network of cooperatives (building firms etc.). With the cooperation of this network of builders, turn-key projects are also possible.
When buying a Log Home, the costs are slightly higher (greater amount of wood in cubic meters) as compared to an Green-Built Conventionally Framed Home. However, in building a Log Home labor expenses can be cut down as there is no need to add extra insulation to the walls.
A laminated log is prepared (glued) from separate sawed heart pieces of logs. This means that the heart of the tree is cut and the natural tension of the tree is eliminated. Therefore cracks in laminated logs are minimal.
In a low energy home the insulation thickness is greater in the walls and ceiling, therefore the energy costs are smaller than in a standard conventionally built home..
The oldest homes made from logs can be found in Central Europe (built in 17th century). There are firm traditions in log building, and there are plenty of log homes still occupied in Finland that were built in the beginning of the 20th century. A log home is an investment that will last from one generation to the next.
There is more than one answer to this question. The thickness of the log depends on the shape, height etc. of the building. But for example, in Finland, a 1½ story building with 215 mm logs all the way to the first floor ceiling and following upwards with 195 mm post and beam construction, it is possible to build in this fashion without an insulated log system.
Typically a single story log structure does not pass inspection without additional insulation. In this case you might have to provide additional insulation to exterior walls at locations such as pantries, areas which may have additional moisture/humidity or perhaps a closet. Typically the thickness of the added insulation is 50 mm.
The recommendation is that the insulation is done using a cinder block structure, and also for outer walls. A gap of 30 mm is left between the log and block.
Usually MSEA-windows are used (wood-aluminium-windows) that have a U-value less than 1,4 W/M2K.
The U-value of doors is also less than 1,4 W/M2K. Mostly the doors are either painted MDF-doors or panel doors.
Due to local regulations relating to frost lines, usually there are foundation requirements in place.
In the past, a ventilated floor system (rossipohja) was commonly used, but currently a ventilated floor would be too thick to be sensible.