The currently popular glued beam( KB) is characterized as the best material for building a wooden house. Many companies specializing in this type of construction recommend to prefer KB to other materials, motivating such a choice with its high environmental friendliness, good strength and other mechanical characteristics.
Building a house is not a cheap pleasure. The mistake made when choosing a material can be fatal. Therefore, before you start building a house, it is worthwhile to figure out whether the CB is really good in fact?
Contents:
- BC stability before cracking
- House from KB is not afraid of shrinkage
- High environmental friendliness of KB
- Houses from KB "breathe"
- Walls do not require additional compaction
- Longevity of KB
Stability of KB before cracking
It is considered that KB is a material not subject to formationcracks. With this belief, you can only partially agree. Yes, the packet of lamellas assembled with perfect accuracy will not give a crack. However, the build process itself is not automated and is performed manually. That is why it is sometimes not necessary to talk about the quality of the material, and consequently its resistance to cracking.
The lamella package, assembled with the slightest deviation, is under the influence of internal forces bending the wood. Therefore, it will not be long to wait - after a short time the praised KB will certainly give a crack.
House from the KB is not afraid of shrinkage
"Specialists" of wooden construction argue that houses of glued beams do not settle over time. It is not true. The houses from the KB give a significant shrinkage - about two centimeters per one meter of height construction per year for the first two years after the end of the works.
If the average height of a single-story house is about 4 meters, then for two years the shrinkage of the house will be 16 centimeters in height! To call this figure an insignificant and not deserving language will not turn.
High environmental friendliness of KB
There is no need to doubt the ecological safety of wood. However, the adhesives that are used in the KB process are so saturated with formaldehyde that there is no question of ecological compatibility of this material.
Harmless adhesives and impregnations still exist, but the cost of construction using a truly environmentally friendly KB will grow at times and become unnecessarily expensive.
For these reasons, you should not use the KB in the bathroom. When repairing an apartment, a mosaic is ideal for a bathroom design.
Houses from KB "breathe"
The most insolent myth about KB.The air exchange that KB can provide can be compared to air exchange in a house with the best plastic windows. This effect is obtained due to the presence in the bag of lamellas of several adhesive layers that are not capable of passing air.
Walls do not require additional compaction
Such an encouraging, but such harmful myth! There are no seamless joints, no matter how qualitative the material would be and no matter how accurate the calculations were.
In addition, no changes in the geometry caused by the weather conditions have been canceled. Therefore, in damp but warm weather, the seams will be "closed", and in a dry frosty one they will "open".Here in these "open" non-insulated joints and heat will leave the house. But for qualitative warming of walls it is necessary to use heaters of a special kind - self-expanding tapes.
Longevity of KB
The last myth about the KB says: "KB is at times more durable than solid logs."In fact, the concept of "durability KB" is to understand the quality of the glue used. It is he who determines the life of the KB.
As for buildings from solid logs, even without proper care, they can stand several hundred years. And if you maintain a good condition of the house from a solid log, protecting the wood from spoilage, moisture and pests, then you can not worry about its durability.
Here it is - the whole truth about the design bureau. Do you need a house like this? The choice is yours.
