Laminated Veneer Lumber

Wigo Group is official partner of the Ultralam™ LVL beams in Baltic region

LVL (laminated veneer lumber) is a technologically enhanced and improved high strength structural wood based material. The complex technological process results in a homogenous material with unique performance. LVL properties significantly exceed those of solid wood, glulam and high-grade timber. Its outstanding properties place LVL among the most advanced and technological products currently used in construction.

LVL enjoys unique strength characteristics, for example, its MOE (modulus of elasticity) is 24% higher than that of solid spruce, while its MOR (bending strength) is twice as high. These physical characteristics ensure high bearing capacity of LVL products at smaller cross-sections which in its turn significantly reduces the total volume of required lumber.

These high characteristics are associated with a number of specific features of LVL production process that ensure the absence of natural wood defects in the structure of the material.

Due to its laminated structure and production technology, LVL is an entirely homogenous material with unchangeable mechanical properties lengthwise and consistent performance irrespective of seasonal factors.  That is, it’s a material with homogenous symmetrical structure that does not change its performance over its entire service life.

Apart from conventional timber materials, LVL products are capable of maintaining precise linear dimensions in spite of seasonal factors, variations in environmental and climatic conditions. LVL neither warps nor buckles when exposed to humidity, neither checks nor rots, offers minimum natural shrinkage and absorbs practically no moisture. Therefore, the dead weight of an LVL beam remains unchanged in humid environment.

The stability of LVL linear dimensions ensures high accuracy of adjusting parts which underlies durability and long lasting appeal of LVL structures as opposed to solid wood products susceptible to swelling and buckling. Apart from metal and reinforced concrete, LVL offers higher resistance to corrosive agents, such as water vapors, ammonium, salty vapors etc. That is why it’s indispensable in the construction of aquatic parks, swimming pools, agricultural and industrial structures.

LVL boasts better fire resistance compared to ordinary beams. This is achieved through multiple layers of veneer and less porosity of material. Phenol-formaldehyde resin is neutral to oxidation and doesn’t support ignition. High density and absence of cracks prevent from fire propagation and thermal effects inside the material. LVL test results demonstrate the ability of the material to maintain its properties within 30-60 minutes at 300°C. Under the specified temperature the beam undergoes slow charring at the rate of 0.6 mm/min flatwise and 1 mm/min edgewise.

The price of LVL is a little bit higher than average prices for other timber materials.  However, LVL-based products maintain their geometry even in as much as ten years which, certainly, justifies the manufacturer’s costs. As opposed to such ordinary construction materials as metal and reinforced concrete, LVL boasts an optimal performance/weight ratio.

This factor is of special importance for low-rise construction, as with an adequate strength reserve, LVL-based structures do not require reinforced foundations and are easy to install, i.e. they can be moved on the ground and lifted onto upper stories without special machinery. As a result, LVL based buildings require much less money and time, as opposed to brick and concrete structures. 

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Ultralam™ LVL Advantages

Unique LVL Ultralam™ properties afford to list it among the most prospective materials used for construction. The application of LVL Ultralam™ covers a wide range of construction and not construction areas.
  • Environmentally friendly engineered wood material with unique performance.
  • Durability and long lasting appeal of Ultralam™ -based structures.
  • Unchangeable performance over the entire service life.
  • Homogenous material with unchangeable mechanical properties lengthwise.
  • Consistent geometry and physical properties irregardless of seasonal factors, environmental variations and climatic conditions.
  • High accuracy of adjacent elements.
  • High bearing capacity.
  • Resistance to corrosive agents.
  • Optimal performance/weight ratio.
  • High bio and fire resistance.
  • High thermal and sound insulating properties.
  • Material is easy to process with any cutting instruments.
  • Material is not subject to deformations caused by humidity variations and has low values of natural shrinkage.
  • There are almost no service costs related to LVL usage.
  • Convenient, easy and fast installation of LVL products.
  • With an adequate strength reserve, reinforced foundations and bearing structures are not required.
  • Price of Ultralam™ products does not depend on their length and cross sections.
  • Easy mechanical processing and preservative treatment.
  • Besides its high physical and mechanical properties, laminated veneer lumber fully retains the appearance of natural wood which allows to use LVL-based products and structures in interior applications without additional finishing.

TECHNICAL PARAMETERS OF ULTRALAM

Condition Relative to the Grain Rb Rs R X I
bending edgewise along the grain 39 27 26,5 19,5 23,5
bending flatwise along the grain 45 35,5 27,5 24 22,5
compression edgewise along the grain 30 25,5 23,5 19,5 22
compression across the grain 5 4,3 3,5 6,8 3,8
compression perpendicular to the plane of veneer sheets 5 1,9 1,7 1,9 1,7
tension edgewise along the grain 25 26,5 22,5 17,5 16,5
tension across the grain - - 0,7 - -
shear along the glue line edgewise along the grain 2,6 2,6 2,6 2,6 2,6
shear along the glue line across the grain 1,1 1,1 1,1 1,1 1,1

MOE Е, MPa. Strain along the grain

Rb Rs R X I
16 000 15 600 14 000 11 000 12 700

Service conditions for Ultralam™ based structures

Note: air humidity is allowed to differ from the tabulated value, if it persists for no longer than two weeks. The products delivered to the Customer should bear a mark of the allowable service class
Service class Moisture content of structures during the usage, % Service Conditions Service Conditions Serviceability measures
    Relative air humidity, % Air temperature, °C  
1 10±2 40-60 20±5 Chemical protection is not required
2 20±2 60-90 20±5 Structural and chemical protection is required
3 More than 22 No limits No limits Structural and chemical protection is required

PRODUCT LINE

Ultralam R  
Thickness, mm 27, 30, 33, 36, 39, 45, 51, 63, 75, 90
Width (height), mm 64, 89, 100, 120, 150, 160, 200, 220, 240, 250, 260, 300, 360, 400, 420, 450, 500, 600, 1250
Length, mm From 2 500 to 20 500 (gradation - 500 mm)
Ultralam X and IX  
Thickness, mm 27, 30, 33, 36, 39, 45, 51
Width (height), mm 64, 89, 100, 120, 150, 160, 200, 220, 240, 250, 260, 300, 360, 400, 420, 450, 500, 600, 1250
Length, mm From 2 500 to 20 500 (gradation - 500 mm)
Ultralam I  
Thickness, mm 27, 30, 33, 36, 39, 45, 51, 63, 75
Width (height), mm 64, 89, 100, 120, 150, 160, 200, 220, 240, 250, 260, 300, 360, 400, 420, 450, 500, 600, 1250
Length, mm From 2 500 to 20 500 (gradation - 500 mm)

Types of Ultralam™

Ultralam Description Application
RS / E15 All veneers are located parallel to grain, G1–G2 grades (primary G1) Load-bearing structures
R / E14 All veneers are located parallel to grain, G1–G2 grades (primary G2) Load-bearing structures
X There are some crossplies, G2–G3 grades structures Load-bearing structures
I / E13, E12 Both parallel and crossply veneers are possible, G3–G4 grades are possible, G3–G4 grades Filler structures and parts for doors and furniture manufacturing

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