The material was prepared with the help of specialists from the Association of Wooden Housing.
Story log houses dates back several centuries, they have passed all kinds of tests both by time and by people, and have proved their worth, although they also have some specific properties. Constructions made of glued beams in our country cannot boast of such an impressive experience and, despite their great popularity, are shrouded in a whole set of myths. AT this material we will talk about the most common "horror stories" associated with glue and the technology itself:
- The technology is “young” - will the lamellas disperse.
- How harmful is glue to health.
- How effective is the glue - will the timber not “stick out” in a few years.
Will the lamellas in the timber not disperse
Glued laminated timber is produced by longitudinal gluing of several wooden planks(lamels), softwood is used as a raw material. The characteristics of this material largely depend not only on the adhesive system, but also on the parameters of the lamellas. To prevent the beam from separating into composite parts over time, the lamellas must meet the following criteria.
Permissible humidity– the board after sawing (usually the thickness of the lamella is 50 mm) is dried to acceptable levels - 8-15%, but the humidity of adjacent lamellas should not differ by more than 4%. Exceeding these limits is fraught with cracking of the beam after the assembly of the structure, the house will not fall apart, but the decorative effect and tightness will definitely suffer.
Quality of lamella preparation- after the initial calibration (minus 1-2 mm), before gluing, a final calibration must be performed on a planer, the output geometry must be almost perfect. Allowed error is not more than 0.1 mm per running meter, “waves” or torn fibers are not allowed.
If the equipment is worn out, with blunt knives or sharpened, but at the wrong angle, it will not be possible to process the lamella correctly.
Although when sawing, the tension between the fibers of the wood is removed, which allows the finished timber to avoid deformation, if the processing technology is violated, the quality of the seam may decrease.
This will lead to disastrous consequences for the already built house.
Oberon FORUMHOUSE User
Fine calibration before gluing is done to align the geometric size along the entire length of the board so that the beam is exact dimensions. This is important both for proper gluing and for the subsequent cutting of glued laminated timber into parts of the house kit. Another 1-3 mm is removed. If non-prongs remain on the board, it should be set aside for re-processing; gluing with non-prostrings is not allowed.
However, our certification of glued beams is voluntary, therefore, tests carried out to prove the conformity of products with the declared characteristics are not practiced in all industries.
In order not to worry about the durability of your house, it makes sense to choose a company that produces timber not according to TU or STO, but according to GOST 20850 - 2014.
It is the most "fresh" and reflects everything modern requirements to the material.
In addition, products must undergo regular testing in accordance with GOST 33120-2014 and GOST 33121-2014 either in their own laboratories (large enterprises) or in outsourcing laboratories (specialized centers). The frequency of tests is up to five times a week, the results are recorded and available for review. That is, high-quality glued laminated timber is produced in compliance with the technology, according to GOST, it is regularly tested, and when buying, you can see all the protocols.
As for the “youth” of the technology, on the contrary, it is already of the “Balzac age”.
Oberon
It is unrealistic to vouch for every house, but the technology itself has existed since the fifties, there are buildings (mainly for industrial and public purposes) of the Soviet era that still exist today. In Europe, test houses are located on the territory of one of the institutes, they have been monitored for more than fifty years. While the "flight" is normal. Tellingly, these houses are specially made without antiseptics, since the main idea of the study is to determine the behavior of the glue joints, and not the wood itself.
It is interesting that in Switzerland, to this day, railway stations built from glued laminated timber are still in operation, and in the building of the main station in Stockholm (1925) there are load-bearing units made of glued laminated timber, and the lamellas are also glued together with casein composition.
Is the glue in the timber harmful?
The production technology itself implies several glue joints in each beam, so potential consumers are most concerned about the environmental friendliness of the material. The beam is produced using various adhesive systems, but most often it is:
- EPI - polymer emulsion with isocyanate hardener;
- MMF - melamine-formaldehyde;
- PUR - polyurethane adhesive;
- PVA - polyvinyl acetate emulsion, is prohibited for gluing house-building structures, as it loses strength under static load.
Glue systems used in the production of glued laminated timber undergo mandatory certification and are environmentally friendly, even if it is MMF. Any glue contains chemistry, but if the glue is of high quality, then all of it polymerizes (converts to solid) when gluing the beam. The content of free formaldehyde in the timber will comply with domestic and European standards - EN 14080 and GOST 33122-14.
Unfortunately, it is neither tactile nor visually possible to check whether the manufacturer uses the high-quality adhesive declared in the documentation, or saves and dispenses with an uncertified system. Therefore, in addition to domestic SES certificates, the plant must also have a personal certificate of the glue manufacturer. The document will indicate that the particular facility uses their adhesive and that the staff is trained to operate the system. As in everything, when choosing a glued beam, the rule “trust, but verify” works.
Oberon
In order not to worry about the environment in the future, ask the manufacturer for Russian and foreign certificates for the glue used. It is quite easy to check a foreign certificate, it contains the e-mail addresses of the institutions that issued it. Even without knowing the language, during the day it is really possible to find information, online translators to help, and find out if such a certificate was issued.
The remaining doubts can be resolved by asking to arrange a tour of the enterprise, if it is possible geographically - write off the name from the label and check what this glue is.
Will the timber stick out over time?
There are situations when, not even years later, but some time after assembly, the beam delamination is clearly visible on the cuts, as happened with one of the portal users.
Кac77 Member FORUMHOUSE
Friends built big house from glued beams, now, due to the numerous sticking and poor-quality assembly, it is not clear what to do next. The manufacturer of the timber and the developer are one person, whoever produced the timber assembled it. The assembly was done in the fall of 2013, in the winter they assembled it under a roof, glazed it, and did not heat it in winter. During assembly, the box fell under heavy rains, before the roof was assembled. At present (summer 2014) there are numerous stickings, practically on all walls and cuts, along the entire perimeter from the inside and outside.
Have you ever wondered what kind of glue companies use when building houses from glued laminated timber. After all, often, making a choice in favor of wooden housing construction, in particular houses made of glued laminated timber, the buyer is guided by the principles of environmental friendliness of the future home. However, it happens that firms, in pursuit of profits, use glue in the construction process that does not meet safety requirements at all. In the article we will consider what types of wood adhesives are used in wooden housing construction which of them are considered the safest from an environmental point of view.
Most often, glued beams are made from pine and other coniferous trees. Structurally, such a bar consists of three or more boards. radial cut. Sawing lamellas is carried out according to a special technology that takes into account the angle of inclination of growth rings to reduce moisture and stress in the wood. After drying, pre-treated lamellas are glued and pressed under heavy load and a temperature of about 200 degrees.
During the manufacturing process of glued laminated lumber, glue is forced under pressure deep into the pores of the wood, which provides a strong bond. Further, after the polymerization of the glue, the beam is planed and cut into the right dimensions. Existing GOSTs and international standards regulate the characteristics of adhesive compositions.
After the final hardening, almost all types of adhesives do not emit harmful substances. However, the manufacturer of the timber is responsible for the question of whether the polymerization of the adhesive has finally passed. Therefore, when choosing a contractor for the construction of a house, you should pay attention to what kind of glue he uses to produce glued laminated timber.
It would seem that the issue of choosing glue should be given maximum attention. In fact, this is not so. Firstly, not everyone understands the very importance of choosing an adhesive system. Secondly, companies often do not delve into the details and nuances. Say, "glue is glue in Africa." Thirdly, many prefer savings to the detriment of quality. After all best adhesives often the most expensive at the same time.
Finished profiled laminated timber
Anyone who plans to order a house should be aware that not every adhesive is suitable for gluing timber. To be more precise, some adhesive systems are simply contraindicated for this. After all, glued laminated timber can be considered the most environmentally friendly pure material only in compliance with production technologies and selection the right glue. Otherwise, the timber loses its “status”, and the houses built from it lose their properties and attractiveness.
The use of melamine glue and other analogues significantly worsens the environmental performance of the timber. After all, environmentally friendly adhesive systems should not contain formaldehyde.
Glulam log house with long lamellas
To date, there are four types of glue for the production of glued laminated timber:
1. Polyurethane adhesive. Differs in excellent manufacturability, quickly hardens.
2. Melamine glue. Widely used in Europe, recent times gained distribution in Russia due to good adhesive characteristics. After polymerization becomes transparent. Has a wide operating range weather conditions – relative humidity up to 80%.
3. EPI-glue (EPI-system - polymer-isocyanate emulsion). Corresponds to both domestic and some foreign standards for the production of wall beams. EPI glue does not contain formaldehyde and belongs to the safest group of adhesives. It is universal and transparent.
4. Resorcinol adhesives. They differ in that after polymerization they acquire a dark shade. It has become widespread in the USA and Japan when gluing floor beams. Used only outdoors.
For environmental friendliness, adhesives are divided into three classes: E3, E2 and E1.
Adhesion characteristics are improved by adding synthetic resins, which release toxins such as formalin, isocyanate and others. For the sake of fairness, it should be noted that the allocated amount is extremely low.
Screed corners of the log house from glued beams
Perhaps everyone has heard that formaldehyde is the strongest poison. According to hygienic standards, formaldehyde is classified as a carcinogen in the subparagraph “probably carcinogenic to humans”. However, during the adoption of the standard in 1998, scientists and researchers from around the world have repeatedly spoken out about the harm to human health from formaldehyde. In addition to acting as a serious allergen and irritant, formaldehyde has mutagenic properties.
Since the production of formaldehyde-based resins is cheap, it is actively used in chipboard production, plastics and other fields. However, the association of formaldehyde with an increased risk of developing cancerous tumors of the nasopharynx has already been proven.
If there is a chipboard cabinet in the house, then this may not threaten health due to the low concentration of the toxin. However, if the whole house is the source, then it can become a serious threat. What to say about the case when it was decided to leave the walls of the house without interior decoration. In addition, in summer, when the ambient temperature rises, harmful emissions also increase proportionally.
Therefore, following the manufacturer of glued laminated timber technological process- the most priority criterion for choosing a contractor.
So, at right choice adhesive system by the manufacturer, the wood will breathe, and the house will really be durable, safe and environmentally friendly. It should be noted that a good alternative to glued beams is a standard solid profiled beam.
Popular environmentally friendly manufacturers of timber adhesives
Two-component adhesive for timber Akzo Nobel (Netherlands) does not contain formaldehyde and toluene, has a European certificate for use in products that come into contact with food. Also, the Akzo Nobel Casco adhesive system fully complies with SanPiN 2.1.2.729-99.
It is used in the production of load-bearing structural beams from laminated timber. It is the strongest adhesive. Has the only certificate for structural adhesive in Europe. Considered environmentally friendly.
The following manufacturers can also be classified as environmentally friendly EPI adhesives: Klebchemie, Kiilto (KESTOKOL WR05 adhesive systems).
Of the Russian manufacturers of EPI-glue, the glue of the Khimtekh NN company (Nizhny Novgorod) can be noted. Domestic epi-glue ViAR-D 4.1 certificate of conformity RossRu.AB 24.N04682.
The adhesive system is the most important component in the production of KDK (glued wooden structures). It should be remembered that wall beams (enclosing structures) and load-bearing wooden structures belong to different classes of responsibility. Therefore, the adhesive system must meet the requirements for strength, durability and functionality of wood structural elements throughout their entire service life. It is no coincidence that when designing a line for the production of glued laminated timber as an adhesive system, according to its own technical specifications and environmental safety, we chose a one-component polyurethane adhesive from the Swiss company Purbond.
Selecting an adhesive system
For the production of wall glued beams and glued wood, which performs the function of load-bearing elements (floor beams, truss system, wooden trusses), mostly used the following types adhesive systems:
- resorcinol glue(based on phenol-formaldehyde/resorcinol-formaldehyde resin)
- melamine glue(based on melamine formaldehyde/melamine urea formaldehyde resin)
- polyurethane adhesive(based on polyurethane)
Resorcinol-formaldehyde adhesive systems are used today in rare cases, mainly for the manufacture of very large CDC of any type, size, responsibility class. Glue seam of black color of high mechanical strength, resistant to chemically aggressive environment. Adhesive components are highly toxic in the liquid state.
Melamine-formaldehyde systems when used in a mixed state (adhesive and hardener) are suitable for the production of glued wood of any type and responsibility class. Forms a vitreous adhesive seam white color, high mechanical strength.
If we talk about a house made of glued laminated timber, then the ratio of the surface area of glued wood to the volume of the premises is already different and this cannot be ignored.
Why?
The most harmful binder of these adhesives is formaldehyde. The emission of formaldehyde at high concentrations can cause irritation of the mucous membrane and disruption of the sensory organs.
Adhesive compositions used in the production of glued beams, furniture, floor coverings, roof structures can emit formaldehyde and volatile organic compounds (VOCs). When using certified adhesives, paintwork materials the content of these substances in each product is very small and complies with the MPC (Maximum Permissible Concentration) of harmful substances. But even if each of the elements that emit harmful substances individually meets the standards, together they can exceed the permissible concentration, which can lead to their accumulation in indoor areas. Major manufacturers melamine and resorcinol adhesives, over the past 10 years, have significantly improved the environmental performance of manufactured materials. And some of them even reduce the production of melamine-urea-formaldehyde compounds and offer new products to the market. But still…
Our enterprise, so far the only one in Russia, taking care of the quality and environmental friendliness of the proposed product, uses polyurethane adhesive from the Swiss company Purbond HB S for the production of glued laminated timber.
Purbond Polyurethane Adhesive
Purbond HB S polyurethane adhesive is a new generation of adhesives for the production of modern wood structures.
All Purbond adhesives are produced without the use of solvents and formaldehydes. The curing of the adhesive occurs with the participation of moisture contained in the wood and the surrounding air. Wooden structures made with Purbond polyurethane adhesives are completely comparable in their environmental properties to natural, non-glued wood. Therefore, timber made with Purbond adhesive does not pose a health hazard during its entire service life. For 20 years, the Swiss company Purbond, with its partner Bayer MaterialScience, has been producing one-component adhesives based on polyurethane (PUR).
Bayer MaterialScience is a leading manufacturer of high quality polymer materials such as polycarbonates and polyurethanes.
Purbond HB S polyurethane adhesive has a number of undeniable advantages before other systems:
- Viscosity is 24000 units. according to Brookfield against 4000-5000 units. melamine, EPI and other polyurethane adhesives. During pressing, the “penetration” of the glue through the pores of the wood in the gluing zone (hungry gluing) is excluded and a uniform, resilient-elastic adhesive seam is provided.
- Single component.
There is no dependence of the curing time on the percentage of glue and hardener. Allows you to glue wood with a moisture content of up to 18% without losing the strength of the adhesive joint. These factors reduce the percentage of product defects in production. - Application versatility
The wide range of HB S (Adhesive systems for engineered wood) opens up new possibilities for the production of laminated wood, be it wall beams or load-bearing wooden structures. - Gentle operating conditions of the cutting tool.
When planing along the glue line, the interval between sharpening the tool almost doubles.
We use Purbond HB S049 glue (non-contact application) to splice the lamellas along the length onto the minithorn. Curing time is only 9 minutes. After 20 minutes, the lamellae can be further processed.
Purbond HB S209 glue is used in our production for the production of multi-layered wood (beams), including structural timber. Open time 20 minutes, pressing time 50 minutes.
Application and certification
The adhesive system is certified and used in Europe, Russia, Northern and South America, South Africa, Japan, Australia and New Zealand.
German national technical approval issued by the institute construction equipment, for the use of PUR adhesive Purbond HB S for the manufacture of load-bearing elements from wood. Certificate number Z-9.1.711, Z-9.1.765
Conforms to the quality control EN 14080, confirmed by the MPA University Stuttgart.
French Institute of Technology. Classification according to Type 1 of tenon joints and glued structures. Certificate Number FCBA n° LBO/GL/MP/403/09/274, FCBA n° LBO/GL/MP/403/09/275, FCBA n° LBO/GL/MP/403/09/276
SANS 10183 SANS 10183 certified by the South African Wood Industry Auditor. Certificate number 030
Type 1 requirements are met in accordance with AS/NZS 4364.
Formaldehyde classification - JAIA (Japan Adhesive Systems Association). Independent control standard against air pollution. Registration number: JAIA-008439
Our production
The use of Purbond polyurethane adhesives of the HB S line allows us to offer you a wide range of high-quality glued products:
ATTENTION! The use of adhesives of dubious origin can lead to a decrease in the strength of the adhesive joint, delamination of the beam lamellas and destruction of the structure.
The popularity of wooden building structures remains consistently high. Wooden structures, in addition to heat conservation, have high aesthetic qualities. Currently, the most demanded structures are made of solid and profiled timber, which have a fairly high life resource when operating in various climatic conditions. Recently, there has been a growing interest of customers in glued beams due to the fact that the latter provides the highest durability while maintaining the same aesthetics and environmental friendliness. For the production of glued beams, adhesive compositions of various chemistry are used - melamine, resorcinol, malamine-formaldehyde, the so-called EPI compositions and many other compositions. All of these compositions solve well-defined technological problems when gluing timber, have their pros and cons. A special class of adhesives in this segment are polyurethane systems that combine high bonding strength, manufacturability, durability, environmental friendliness and maximum convenience when tooling wooden structures made on their basis.
PU INDUSTRY LLC sells polyurethane glue for wood. You can buy this product in bulk at a price of 265 rubles/kg.
We invite you to purchase polyurethane glue for wood and timber.
Planned deliveries of NovaCol one-component polyurethane adhesive compositions for the production of glued laminated timber are coming from the warehouses of the PU INDUSTRY plant. Adhesive compositions "NovaCol" are applied in a discrete or continuous way, are used for gluing almost all types of wood, provide the required standards for gluing quality and productivity.
Distinctive properties of NovaCol adhesive compositions
- high manufacturability - easily processed by any glue application machines, including manual way application;
- uncritical to high residual wood moisture;
- high resistance to warping of wood;
- high resistance to changes in humidity and temperature;
- provides less wear of the processing and cutting tools;
- harmlessness and environmental safety.
The production of glued laminated timber is one of the most promising directions development of the woodworking industry. This building and structural material is obtained by gluing individual small-sized lamellas into especially strong specimens of the appropriate length and section.
Types of raw materials
For building houses Garden House uses glued laminated timber made from selected wood, which the manufacturer purchases from the most famous sawmills in the world. All of them have an FSC certificate of conformity issued by the Forest Stewardship Council.
For the manufacture of timber, four types of wood distributed according to grades are used:
Pine
The color of the wood is white with a yellowish or reddish tinge. The texture is expressive, with knots different shapes and size. Density: 520 kg/m3. The material lends itself well to processing with coloring and impregnating compounds. Pine is used to make wall and structural glued beams, truss systems, materials for finishing floors, and cladding stairs. Raw materials are harvested in the Komi Republic or Karelia, as well as in the Arkhangelsk region.
Cedar
sound softwood with yellowish-white sapwood and yellow-pink heartwood (cedar pine). Differs in soft uniform texture with small knots. The density of cedar is 420 kg/m3. To his distinctive features refer pleasant aroma and antiseptic properties. This wood does not rot, does not warp, practically does not shrink. All types of building and finishing materials are produced from cedar glued beams. Cedar wood is harvested in the Krasnoyarsk Territory and Altai.
Larch
The color of sapwood and heartwood, like that of pine, is different. Shades - from pale yellow to reddish. The texture is decorative, with clear curls and winding stripes. The rock density is 580 kg/m3. It is comparable in hardness to oak. Oils and paints perfectly fit on the larch surface. Many types of building, finishing and structural materials are made from this wood, as well as window and door blocks. Timber harvesting zones - Krasnoyarsk Territory and Altai.
Spruce
Light wood of a yellowish tint, without a pattern, with small knots. Density - 430 kg / m3. Relatively light, but at the same time strong and elastic material, on which oils and all types of paint fit well. It is used for the manufacture of wall and structural glued beams, truss systems, beams, finishing material. Spruce is harvested in Karelia, Komi, Arkhangelsk region.
In the production of timber, different types of wood are not mixed. Therefore, the customer receives the material only with the wood pattern that he has chosen.
Production stages
Glued laminated timber is produced by a special multi-stage processing of raw wood. At the same time, the technology and the sequence of stages are clearly observed.
Stage 1. Drying lumber
Wood is carefully selected according to standard sizes, geometric parameters and grades in accordance with GOST 8486-86. Then dry bags are formed. Lumber is processed in special chambers. They pre-set a certain drying mode, corresponding to the type of wood and the cross section of the material.
The moisture content of the treated lamellas should decrease from the natural level to 12%, with allowable fluctuations within 2% in both directions (GOST 20850-84). This indicator is checked by moisture meters immediately after drying. Lamellas that do not pass the test are rejected. At the same time, they are automatically dumped into a special compartment.
Stage 2. Calibration and splicing of lamellas
Materials that comply with the standard are sent for calibration (pre-planing). Then marking and cutting of wood defects - rot, cracks, too large knots, mechanical flaws. Defect-free workpieces are sent to the splicing section, where they are joined end-to-end with glue on mini-spikes. Splicing of blanks for the so-called "Finnish" timber is carried out on serrated-wedge-shaped horizontal spikes. A 20-minute exposure time is provided for the adhesive to cure. The inner and outer lamellas are then sorted automatically.
Stage 3. Production of glued beams
After pre-treatment, the inner and outer lamellas are delivered from the warehouse to planer. There they undergo the final calibration in accordance with the program specified for the equipment. Then glue is evenly applied to the surface of the lamellas with thin continuous jets. Then they are sent to the loading and pressing system, where the package of blanks is aligned on all sides and pressed under a certain pressure. Thus, the blanks are connected into a glued beam. The holding time in the press is 50 minutes.
The one-component adhesive cures due to the moisture contained in the wood and the surrounding air. The seams are uniform and strong. Compliance of the quality of adhesive joints with the requirements of GOSTs is checked in the laboratory. At the same time, the resistance of joints to moisture, delamination is monitored, and the resistance of adhesive gear joints to static bending is tested.
Stage 4. Machining and repair
The finished beam, intended for the manufacture of wall elements of the house, is processed in a four-sided longitudinal milling machine. Instances are calibrated to obtain accurate geometric shapes. It also ensures high cleanliness of the surface of the layers, and, if necessary, profiling is performed. Such a beam, when assembling the walls of the house, creates a tight connection of spikes and grooves between the crowns, which does not require the installation of insulation. The latter is necessary only for the assembly of houses from the "Finnish" timber. After profiling, small chips and other defects are eliminated at the repair station.
Stage 5. Manufacturing of parts
Details, structural elements of the house, floor beams, rafters are made on high-precision automated woodworking complexes. On special equipment, crown connections are milled, cups are machined, grooves for sliding mount window block. Are drilled out technological holes under the studs, dowels, engineering Communication. The machine cuts parts according to pre-prepared files. At the exit, all products are labeled, numbered and packed in protective film. The length of such transport packages can reach 12 m.
Adhesive system
The strength and environmental friendliness of glued wooden structures (LLC) largely depend on the composition of the adhesive systems used. The latter should provide long-term strength, inviolability and reliability of wall enclosing and load-bearing structures. Great importance It also has an environmental friendliness of the finished material.
Types of glue for the production of modern KDK
The choice of gluing materials depends on the purpose and type of finished wooden structure:
| Type of KDK | Adhesive system | Peculiarities |
|---|---|---|
| Serial products and large structures made of wood, parts of prefabricated houses | Resorcinol (based on phenol or resorcinol-formaldehyde resin) | Forms a strong, chemical-resistant seam in black. In liquid form, it contains toxic components that are especially hazardous to health. |
| glued wood various types and classes of responsibility | Melamine (based on melamine urea or melamine formaldehyde resin) | Forms a strong white vitreous seam. Contains harmful ingredients |
| Glued laminated timber used for the construction of facilities | Polyurethane (PUR) | Provides reliability, high functionality and environmental friendliness of ready-made KDK |
The Garden House company builds houses from high-quality glued laminated timber, the production of which uses Purbond (Switzerland) polyurethane adhesive, safe for health, of the HB S line.
Benefits of Purbond PUR Adhesive Systems
Purbond introduced its first line of adhesives over two decades ago. This manufacturer became the first developer of PUR technologies used in the manufacture of load-bearing glued wood structures. Today, one-component adhesives Purbond systems actively used throughout the world. Their demand is explained by the five main advantages:
- High viscosity.
This figure is 24,000 Brookfield units, which is approximately 4-6 times higher than other PUR adhesives and melamine systems. Increased viscosity eliminates "hungry" gluing during the pressing process, in which glue particles penetrate into the pores of the wood. The seam is uniform, firm, elastic. - No additional components.
The one-component nature of the material eliminates the dependence of the solidification rate on the ratio glue mass and hardener. This ensures a reliable setting of wood surfaces, the moisture content of which is up to 18%, and the amount of marriage is reduced to a minimum. - Improving the working conditions of cutting tools.
When planing in the area of adhesive joints, the dulling of the blades occurs more slowly. Therefore, the periods between sharpening are doubled. - Environmental friendliness.
In the production of PUR adhesives, formaldehydes and solvents harmful to health are not used. When cured, only carbon dioxide is released into the atmosphere; in the cured state, the material is inert. In terms of environmental properties, such products are comparable to solid wood. - Resource saving.
For gluing, the minimum amount of substance is used, compared with other adhesive systems.
Garden House uses Purbond PUR adhesives for lengthwise lamella splicing (HB S049) and for laminated timber (HB S209). The use of these materials excludes delamination and destruction of the CDC.
Timber packaging
Finished parts and materials are delivered to the packaging area. There, packages for the house kit are formed, sorted according to the crowns of the future structure. Glued laminated timber is placed on wooden pallets, in accordance with the marking. It helps speed up and streamline installation work Location on. A separate specification sheet is attached to each assembled and packaged package.
Special packaging properties
After assembly, each of the packages for the house kit is carefully packed and pulled together in several places with strong PVC tape. As a packaging material, a special two-color film with a density of 90 microns is used. Its inner surface is painted black, outer - white. Light outer side film reflects Sun rays, which prevents overheating of the contents of the package.
Glued laminated timber packed in such a film:
- reliably protected from atmospheric dust and dirt;
- not affected by the greenhouse effect;
- retains normal color, structure, moisture;
- protected from fungal attack.
In such a functional package, products made of glued laminated timber can be stored outside the warehouse for a long time.
What is included in the complete package
The house kit is a kind of building kit. It consists of a complete set of elements necessary for the construction of the object. By agreement, a preliminary antiseptic treatment of the timber is carried out. The house kit includes numbered wall parts, beam ceilings, rafters with crate and other materials. When transporting it, a strapping frame made of wooden boards is installed.
A ready-made house kit made of durable glued laminated timber simplifies construction, increases its efficiency and reduces cost. The Garden House company uses glued beams of the most High Quality. The maximum speed of construction and complete satisfaction with the result are also ensured by the high precision of the details and the professional assembly of the house.