Glued laminated timber

 

Glued laminated timber possesses all the good qualities of wood that logs or the regular beam do not possess. It is a dry building material which has minimal shrinkage, less liable to crack, is light (does not require solid basements) and attractive (does not need interior finishing), the beam walls can be assembled very quickly which helps save considerably time at the construction site.

We manufacture glued laminated timber ourselves from high quality Finnish pine wood, profile it and then cut it to make walls, beams and other structures. Glulam is manufactured not from the regular but specially sawn boards (lamellas). They are glued using a special technology with adhesive, which must meet the European standards to protect the human health. Wood which is used for production of glued laminated timber is cut in the winter, when sap flow in trees is minimal. This significantly increases rot resistance in wood. Material drying is done in the drying chambers for few weeks using a special automated program.  Gluing of lamellas is also made using a special program where the ratio of temperature and pressure has an important role. Then a beam is profiled on the high-precision machines. We can manufacture beams up to 350mm in thickness and 450mm in height.  Through our experience, the most popular size is 202mm (thickness) x 180mm (height) which is made out of three lamellas.

 

Popularity of this timber is due to economic and structural advantages. Among other factors it has sufficient, even by the Finnish stringent energy efficiency requirements, coefficient of heat conductivity U = 0.54 W/m2K. A thinner wall cannot keep heat so well in frosty winters and thicker one requires more material and that is why it is more expensive. In addition, the height of 180mm is optimal when there is a need to make the panels imitating timber because panels that are more than 180mm in height are more susceptible to deformation even though it is correctly dried and cut properly.

Higher or thicker beams, for example, 180x260mm, 240x260 mm and so on require more lamellas and are considerably more expensive than the 180mm beam. Timber imitating panels with more than 180mm height are more subject to deformation. Nevertheless, this kind of beam is in great demand because of the low thermal conductivity and aesthetic reasons, for example, in construction of 2 or 3 storey houses.

In countries with warmer climate beams of 88 mm, 114 mm and 134 mm are used. They are made with two lamellas, and therefore more preferable for buildings that do not require year-round heating. In the northern countries, such timber is used for yard buildings and summer houses.

Walls manufactured by us from glued beams have all necessary trimmings, exterior sidings for windows and doors, all seals, bitumen strip, dowels and bolts, so these walls can be easily and readily assembled and all parts are included, therefore there is no need for any additional adjustment or parts needed.

In our walls, we use multiple types of seals at the same time. This is done to create high efficiency and ecological compatibility as well as fire resistance and thermal conductivity requirements.

A self-expanding seal PSUL (ILLBRUCK T50/2-6P631 50/2-6) is placed in between the inner joints. It is used for protection from such factors as rain, wind, cold and sound.  Because this seal doesn’t prevent movement of water vapor, wood continues to ‘breathe’ and condensation does not accumulate in the joint causing mold, fungus and rot.

The main seal - THERMO-PP 50 mm is placed in the slots. A specific fibrous structure of PP-TERMO allows air to effectively bind, providing an excellent insulating effect (up to 0.033 W / mK) for this material. PP-TERMO does not bind moisture, it allows the structure to ‘breathe’, transmitting vapors and gases so that the insulating material itself is not moist.  In addition, PP-TERMO meets international fire safety requirements (ISO 11925-2), it is also a non-toxic and dust-free insulating material which does not cause allergic reactions.

This is the only type of seam seals approved by the Allergy and Asthma Union.  The effect on air quality of this product belongs to the upper class of the International Classification M1 emission into the atmosphere.

PP-TERMO does not cause growth of mold and microorganisms and does not attract germs and pests to its surface.

EKO seal 40 is a perfect supplement to prevent moisture and blowing along the joints and it is glued in the form of a narrow white ribbon of 8 mm width on top of the joint.



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