Shrinkage is a natural and unavoidable phenomenon in a wooden house. It is caused by the drying of wood. The drying of walls, beams and joists are uneven, because the sun heats and blows the wooden structures differently on each side.
Method of corner notching.
Tightness and density of logs.
Materials for joining of logs: wooden or metal pins.
If the structure is assembled from very wet timber, drying will cause significant deformation of the timber. Therefore, all logs must be properly dried before the start of the erection.
The preparation and assembly of the logs during construction can affect shrinkage of the house. If the logs are not properly prepared, treated or assembled, movement problems can arise.
If these factors are not taken into account, the house can be severely deformed:
Moisture content of the material during erection: When logs are initially used for construction, it is essential that they are properly dried. This process involves kiln drying the logs to achieve a moisture content of 18%-20%.
Shrinkage and movement: Logs shrink and move as they adjust to their environment, with this process being more noticeable in the first few years after construction. This is a normal part of a log home’s maturation. The amount of movement depends on several factors, including the type of wood, the initial moisture content, and the environmental conditions.
Seasonal variations: Seasonal changes in moisture content also play a role. During dry and warm seasons, logs lose moisture and shrink, causing them to move. Conversely, in wet and humid seasons, logs can absorb moisture and expand slightly, counteracting some of the shrinkage.
Reducing moisture-related shrinkage problems: To minimize shrinkage issues related to moisture content, we use dried logs. Properly dried logs shrink less. Additionally, we equip the house with compensation mechanisms to further reduce movement.
It is important to note that while some movement is an expected and normal phenomenon, drastic or uneven shrinkage can be a sign of problems. Proper design, construction methods and ongoing maintenance are essential to ensure that shrinkage is within acceptable limits and that the structural integrity of the log house is maintained over time.
Selection and preparation of logs:
Log house design:
Log structure:
Care practice (client):