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Secrets of building of wooden houses:

German and Canadian technologies of "Curtaining of external corners"

Use of metal couplers for connection of logs in notches

Notches in the house corners (Canadian notch)

Use of a special dowel (thorn) in the Canadian notch

"Undercut": application of a special gap on an axis of logs

Drawing antiseptics on all latent surfaces of a log shell

Use of technological cuts for management of formation of cracks in a log

Making of apertures under joiner's products

Features of technology of building of houses from an oval-flatten (a semioval log)

Joint application of a round log and an oval-flatten

 

 

Use of a special gap on an axis of logs (undercut)

Certainly a just cut down log house on a building site looks beautifully if logs lay "one-to-one", without cracks and gaps. Especially if to look from end faces of logs in corners of notches, in window and door apertures.

But the problem is that in this case in 2-3 years it will be big enough cracks between logs which not only will spoil appearance of your wooden house or a bath, but, the most important thing, will negatively affect heat conductivity of timbered walls. It will demand constant calking and uses of hermetic, and, in the most negative cases, even special warming of walls.

Why does it happen? Let's consider this in details. It not an idle question: unfortunately, in many building companies masters do not know about it and, especially, cannot explain to you as to customers of the house or a bath.

To prevention of formation of cracks after shrinkage of a log home shell, technique of creation of "undercut", i.e. a gap on an axis of logs is applied in the company "Log Russia". This gap gets out in the bottom part of a log on all its length, and from end faces it is hardly less (5-8 mm together with height of curtaining of external corners), and, in invisible parts of a log, hardly more (10-15 mm), see fig. 1.

Let's notice, that features of creation of an undercut for an oval-flatten (a semioval log) are considered in separate section.

In drawing 1 the forces operating on a log during shrinkage are shown. Owing to influence of these forces, first of all, there is a crack in the bottom part of a log. With time it increases (fig. 2).

If this gap was not primary between the top and bottom log than edges of a groove of the top log would reveal as wings, having formed considerable longitudinal cracks along lines of contact of logs.

In our case "wings" also reveal, but at the expense of gap there is "a soft planting" of a top log on bottom, and groove edges even after expansion densely enough adjoin a surface of the bottom log (fig. 2).

On the manufacturing end
After shrinkage of shell
Fig. 1
Fig. 2

 

 
In common - curtaining of external corners and an undercut
 

As it looks in practice is shown in following photos (fig. 3... 5).

And let you not be frightened by crescent gaps between logs (fig. 3), especially in window and door apertures (fig. 4 and 5), now you know, that it is a special step of masters of the company "Log Russia" which will protect walls of your house from negative consequences.

Fig. 3
   
Manual shell building - a gap in a window aperture
 
Undercut - a close up. Features of building of wooden houses
Fig. 4
Fig. 5

The resulted information is the intellectual property of " Log Russia".
At a reprint of materials, the reference to a company site is obligatory.

 

 

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