After cutting a tree, physical and chemical changes begin to occur in a log, one of which is the drying of the logs, as a result of this process, made of fresh cut wood (log house) gives shrinkage.
Shrinking time: The active period of shrinkage is the first 6 months, during this period, the log house can shrink up to 5% of its height, and up to 10% per year. Up to 3% can assume to the second log house.
Factors affecting the shrinkage.
1) The height of the structure. Accordingly, the higher the structure, the greater the load on the lower crowns, the more the percentage of shrinkage increases.
2) the width of the groove.
3) type of cutting.
What can the drying of logs affect?
For the first time for six months for not large baths 3*3 and from year to two, it is extremely recommended to install various elements (windows, doors, ceilings, walls). This condition is due to the fact that the elements are attached to logs and in the process of shrinkage can change their geometry or lead to not permissible changes in the design.
After the main shrinkage phase, individual elements require certain conditions for installation.
Installation of doors and windows in a log house.
There are several ways to attach the door to the logging.
1) a groove is made in the doorbox.
2) cutting the groove directly in the opening. In this case, the beam is inserted into the groove. In this case, it is necessary to take into account the height of the beam.
3) True (casing).
It must be remembered that you can not nail the beam in the groove with nails, as they can interfere with the shrinkage.
It is important in the listed methods:
1) the height of the door box should be a few centimeters (about 10 cm) below the opening.
2) you can not nail the door frame to the log house.
These decisions allow the log house when shrinking calmly take its position and do not hang on the door box.
The installation of windows is performed according to the same conditions that the doors.
Compensators (jack, shrinkage screw).
In buildings with spaces on the second floor or terrace under the common roof, it is necessary to install compensators (jack, shrinkage screw). In the process of shrinkage of the log house, it is necessary to unscrew the nut, while the distance decreases and nothing prevents the logs from giving shrinkage.
If the internal walls are made from the frame. The solution may be to install a bar in prepared bowls. This mount allows you to reliably fix the beam, and at the same time there is the possibility of its movement in the bowl.
Nagging.
Logs in the log house are interconnected by a cylindrical inch. When installing them, it is necessary to make holes 5 centimeters more than the waddling itself, this will allow them to delve into the shrinkage and thereby will not raise the upper log.
In no case do not use metal baches (reinforcement) – you also had to observe such masterpieces.
Photo consequences of errors when installing parts.
