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Technology

Building of wooden log houses is a difficult process, to the person far from the building industry it is difficult to understand the differnce in quality and cost of houses built by different companies. Wooden house-building has some particularities, and using this knowledge we can apply all the modern techniques to the bulding process. Craftsmen of the company "Pushchin House" use the best practices in housebuilding accumulated in Russia and in the countries of Western Europe as well. Unfortunately, most of the western technologies are practically not used by other Russian companies in full.

We have tried to describe essence of all techniques applied by us in the building process. We hope, that the presented material will be interesting and useful to you, will help to generate more intelligent opinion on view of your future house. Besides, now you will know, on what moments it is necessary to pay attention at the contract conclusion to building of your future dwelling.


Building material

We start with only the finest building sawlogs from coniferous breeds (a pine, a fur-tree, a larch), which undergo careful selection. We build houses of a round log (diameter of logs from 26 cm) and an oval-flatten (a semioval log in the thickness of 20 cm or 25 cm).

To prevent occurrence of fungi, mould we draw antiseptics on all latent surfaces of a log shell. All logs are elaborately hand-peeled by our highly skilled carpenters using manual electroplane, which ensures you clean, bright and smooth logs. Additional plus is that the walls made of logs pared down by a manual electroplane, do not demand the further furnish.

German and Canadian technologies of "curtaining external corners" for reduction of gaps between logs after shrinkage of house.

Often when we look at appearance of a log house directly after construction, the gaps between logs on internal part of walls and on corners are minimum – all looks perfectly. But if we wait 3-4 years, we will see, that for this term the house will shrink at the expense of shrinkage of logs (5-10 % from diameter of logs). If house had identical shrinkage on external corners of the house and on internal walls, all would be remarkable – gaps everywhere would remain insignificant and your house would stay warm and beautiful. One of the features of wood as a material is that external corners always have the bigger humidity, than a material of the basic (central) part of a wall. That's why shrinkage of external corners will be smaller. And as so, "hovering of logs" will happen in the central part (they will lean against corners) that will inevitably lead to cracks, especially on internal surfaces of walls.

To reduce problems with shrinkage the German technology is used. On external corners the additional gap between logs about 5-8 mm is left. We will notice that for internal parts of walls this gap should not exceed 2 mm. Owing to the deformation of logs caused by non-uniform shrinkage of logs on corners and in the central parts of walls, the definitive gap on all length of a log will be uniform and minimum.


Notches in the house corners (Canadian notch)

Manufacturing houses of a round log, we use the traditional Canadian "bowls", which is in our opinion the best of possible options due to its good caracterisics. The basic difference of the Canadian cup is a triangular form of a bowl and presence of a notch, which is very important when after 2-3 years of house construction the shrinking process begins. When the shell begins to shrink in the course of time, due to presence of notches and the triangular form of a bowl there will be a jamming of the formed gaps, there will remain warm and, that is important, beautiful cutting.

In our company we also use an advanced Canadian notch (with a dowel). The dowel is intended for warming of corners of the house and elimination of their "venting" after shrinkage of a log shell of your handcrafted log home.


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 we 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 there will be big enough cracks between logs which not only will spoil appearance of your wooden house, but more significantly will negatively affect heat conductivity of timbered walls. To prevent formation of cracks after shrinkage of a log home shell, technique of creation an "undercut", i.e. a gap on an axis of logs is applied in the company "Puschchin House".

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). During shrinkage forces influence on a log, owing to which, a crack appears in the bottom part of a log. 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.


Norwegian semi-oval (lafet) houses

Semioval log or so called "lafet" has come to us from Norway. A thickness of walls is about 20 cm, very warm notches provide comfortable habitation at northern latitudes.

Comparing to the round logs, the oval-flatten creates visual lightness of a design of a log shell. Besides there are some more advantages of walls made of an oval-flatten.

For instance, the increase in effective area of premises as you have a flat wall, only 20 cm in thickness.

In manufacturing handcrafted houses from lafet we use the Norwegian technology, which assumes:

- Use of notches and dowels;
- Necessity for the organization of curtaining of external corners disappears, as there is a self-jamming of gaps between logs;
- The undercut in invisible places, on the contrary, should necessarily be organized;
- Notching of apertures under platbands in door and window apertures is not required.


Assembling of a log shell

The log shell is assembled twice. First-during manufacturing on our building site, which is situated in the Leningrad region. After wood processing, the logs are marked with the numbers, the shell is demounted, packed and delivered to your lot. There we assemble the log shell for the second time on your basement.

Installation of the shell is preceeded by a levelling of the groundsills, which are laid precisely aflat. The distance between opposite diagonal lines should be equal. Violating of these basic requirements may lead to the vertical offset of the shell, which in its turn will hinder roof installation, flooring and so on.

The company Puschchin House offers the whole range of services in housebuilding, including base building, roofing, windows and doors installation.

Engineering communications including heating, ventilation, water supply, plumbing, illumination we entrust to our contracting company, with which we have been sucessfully cooperating for many years.

After all the necessary building services are completed, the finishing work is the last stage of building your Dream Home.