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Square log houses production technology
Basics of the production of squared timber houses.
The production of squared timber houses started in Ritsu after the completion of a special production line and laminated timber press in 2004. Today we manufacture squared timber houses with wall thicknesses of 88, 114, 134 and 202 mm.
We pay a lot of attention to quality when purchasing material. We glue and press the blank squared timber wall ourselves. We exercise direct control over the quality of material assembled here. In the case of a larger volume of orders we obtain laminated timber material also in Finland. Since it is an expensive product, we cannot afford buying defective material, and all material is scrutinised already before planing.
Profile planing of the wall parts of the house always takes place in the Ritsu plant. Immediate forwarding of profiled material to the house production line is crucial. Thus we achieve great measuring accuracy and better fitting of the parts when processing. Since timber is a living construction material, changes in temperature and the surrounding environment will affect its moisture content and therefore dimensions. Timber stored for a longer period of time may twist and warp. This is not an issue in the case of the immediately consequential processing operations performed in Ritsu technology.
When manufacturing squared timber houses, we use several different production installations starting from semiautomatic machinery and ending with CAD CAM technology.
The corner tenons of squared timber houses consist of a basic and a wind tenon. The construction of the corner tenon enables laying insulation material around the tenon neck. Power cord, inserted tenon and threaded bar openings are drilled with drills of various diameters. Thus it will be more comfortable to erect a wall set on the construction site. There is no risk of installing the wrong part in the wrong opening.
45-degree ornamental end cuts can be performed on purlins or any other protruding logs. Hip logs are cut to an angle fixed for roof inclination. To install T-bars in window and door edges, mill cuts have been performed. Window and door openings are cut to the height dimension foreseen in the design. In order to render transport and installation simpler, the cut-out log part will be finally removed on the construction site when the log is mounted.
After the manufacturing of the parts they will be marked according to the mark foreseen in the design. Every finished part has its place in the house. The impregnation of wall parts is performed by watering or spraying. The parts are packaged after a short drying period.
The impregnation agent will protect the timber against blueing and fungal diseases during transport and in the course of construction works. In three months the effect of the agent will fade step-by-step. The presence of the agent will have no effect on the finishing works of the log house.
The external walls of the squared timber house can be insulated and covered with boarding. With the assistance of the special Ritsu technology, also combined wall houses and city log houses can be manufactured.
Combined wall log houses
It’s a special solution for laminated square log houses, which allows manufacturing corner tenons of various sizes for wall logs of various diameters on the same production line. This allows crossing thinner (with a diameter of 114 mm) wall logs with thicker (with a diameter of 202 mm) wall logs.
Production starts from entering the design into the machine. The program selects parts that are most economic to manufacture of a log with such a length and thickness. Whereas there’s often little room at a construction site, then it’ll be more comfortable to open the packages one by one; therefore the installation order at the erection works of a building is taken into account when manufacturing and packaging the logs.
The machine is capable of manufacturing six different corner tenon joints within a single house project. Four special mills operate when performing a full tenon. The immobility of the log during the whole milling of the tenon will ensure the measuring accuracy of the result.
Tenoned ceiling beams can be manufactured on the production line. Inserted ceiling beams are usually made of smoothly planed logs and vary from wall logs by size.
Purlins or any other longer protruding log ends can be cut to a 45-degree angle.
The sides of every window and door opening have grooves for the installation of tender bars, which helps to fix windows and doors as required. None of the opening fillings of the log house may be mounted rigidly.
Openings with different diameters for thread laths, electrical wiring and hidden pegs are drilled into logs at the factory. That makes construction works easier. Also seats for electric sockets, boxes and switches can be milled already on the production line.
The ready-made logs are impregnated, so that all openings processed into the log will be covered with an impregnating agent. After a short drying period logs can be packed. A packing list is fulfilled when packaging material to make it easier to find required elements at the construction site.
The picture below shows the joints and drilling of openings in a log wall and inserted ceiling beams with various thickness.
- The combined wall log house system allows designing a variety of space solutions, using long logs with no joints and designing large openings.
- Thinner internal walls make the set price lower.
- The useful floor area of the house is bigger thanks to thinner internal walls.
- The mounting of lighter internal wall logs can be performed faster, since no crane is required to install them.
- The wall parts are ready to be installed. No complex work operation needs to be done at the construction site, since all required drilling, sawing, milling of openings have been performed at the factory.
- Thinner internal wall logs and internal doors with a smaller jamb extension take less room in a package; thus the transport costs of the house parts will be smaller.