Finnforest Kerto
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Kerto® All the benefits of timber All the strengths of composites

3 Kerto is a laminated veneer lumber (LVL) product used in all construction jobs, from new buildings to renovation and repair. Kerto is strong and dimensionally stable, and it does not warp or twist. It derives its high strength from the homogeneous bonded structure which also keeps the effects of any defective single veneers down to a minimum. Kerto is produced from 3 mm thick, rotary-peeled softwood veneers that are glued together to form a continuous billet. The billet is cut to length and sawn into beams, planks or panels in the sizes that customers require. Kerto products are CE marked...

4 One of the notable features of Kerto-S is that the grains run longitudinally through all the layers. The fi nished panel is cross-cut and rip-sawn to order. Kerto-S is normally supplied in the form of straight beams but it can also be specially cut and shaped as required. Kerto-S combines excellent technical performance with ease of use. Its essential qualities include strength, dimensional precision and stability. It is the ideal choice for beams whenever long spans and minimal deflections are required. Kerto-S beams are suitable for all roof shapes, also performing well as joists and...

5 Maximum spans (m) of Kerto-S floor joists Span table of Kerto-S main floor beam 51 x 200 45 x 260 45 x 300 51 x 300 45 x 360 51 x 400 0 1000 2000 3000 4000 5000 6000 7000 8000 Maximum spans (m) of Kerto-S roof rafters Snow load Sk = 1.0 kN/m² Snow load Sk = 2.5 kN/m² Design calculations according to EC 5 and the Finnish National Annex. C/c spacing of rafters 900 mm. Support length 120 mm. Roof slope 1:3. Self-weight of the roof 0,9 kN/m². Spacing of upper lateral torsional buckling supports 400. Deflection criterion: final deflection wfin L/200. 45 x 200 51 x 200 45 x 260 45 x 300 51 x...

6 Kerto-Q is cross-bonded Kerto. This means that onefifth of the veneers are glued crosswise. This structure improves the lateral bending strength and stiffness of the panel, thus increasing the shear strength when used as a beam. With crossbonded veneers, there is an essential reduction in moisture-dependent variations across the width of the panel. Kerto-Q comes in the same dimensions and lengths as Kerto-S, except that its maximum thickness is 69 mm. Full-length Kerto-Q is a popular material in floor and wall panels because it stabilizes the whole structure, and good fire resistance is...

7 Kerto-T is just like Kerto-S, but it is made from lighter veneers. Nevertheless, its straightness and dimensional stability are as good as with Kerto-S. This makes it ideal for studs to be used as load-bearing and non-bearing structures in external and internall walls. With Kerto-T it is easy to construct high walls, which can be counted on to remain straight. Kerto-T can be used with any sheet materials that are easily fi xed without special tools. Kerto-T for wall studs KERTO-T: TYPICAL SIZES Thickness Width Length mainly 39–45 mm mainly < 200 mm mainly < 8.5 m

8 Because of it’s strength, straightness and dimensional accuracy, Kerto is an excellent material to use in a wide variety of industrial applications. • Roofing and flooring panels for the construction industry • Components for the pre-fab housing industry • Door frames • Composite windows • Floor, wall and roof battens • Scaffolding planks • Concrete form beams • Vehicle industry • Stair stringers Kerto for industrial applications

9 PROPERTY Symbol Kerto-S 1) 21-90 mm Kerto-Q 1) 27-69 mm Kerto-T 2) Bending strength Edgewise fm,0,edge,k 44.0 32.0 (300/h)s*27.0 Size effect parameter s 0.12 0.12 0.15 Flatwise, parallel to grain fm,0,flat,k 50.0 36.0 32.0 Flatwise, perpendicular to grain fm,90,flat,k - 8.0 - Tensile strength Parallel to grain ft,0,k 35.0 26.0 (3000/L)s/2*24.0 Perpendicular to grain, edgewise ft,90,edge,k 0.8 6.0 - Compressive strength Parallel to grain fc,0,k 35.0 26.0 26.0 Perpendicular to grain, edgewise fc,90,edge,k 6.0 9.0 4.0 Perpendicular to grain, flatwise fc,90,flat,k 1.8 2.2 1.0 Shear strength...

10 Kerto can be further processed in many different ways according to its end-use and the customer’s particular wishes. The further processing service is an integral part of the customer service and supply chain. Further processing takes place at the production plant or at a service centre in a particular country, whichever is more competitive and economically efficient for the customer. • Sanding: optical or calibrating • Profiling of the beam edge, e.g, tonguing and grooving • Special sawing: both straight and tapered shapes • Gluing: re-gluing for increased thicknesses • CNC machining:...

11 The versatile Kerto is an ideal material for a constructor. Examples of innovative uses have been gathered from around the world during the thirty-year history of Kerto. Ideas for inspiration Cafeteria of Jean-Baptiste Corot school in Savigny-sur-Orge, France Martin Nadaud gymnasium, Saint Pierre des Corps, France Base ball stadium, Kuopio, Finland Kindergarden and school Leskenlehti, Helsinki, Finland Kerto was awarded the Schweighofer Prize, Europe’s top innovation prize, in 2007. Find more inspiring ideas from our website: www.finnforest.com.

12 Finnforest is a leading supplier of eco-efficient wood-based solutions. Its building and furnishing products are energy-efficient throughout their entire life cycle and enhance the built environment and the quality of living. The products and supply chain are continuously developed in close cooperation with the construction industry, other industrial customers, and the retail sector. 6/2010 www.finnforest.com Finnforest Birch Plywood Finnforest Kesto Plus Impregnated Timber Finnforest Spruce Plywood Finnforest Kerto® Finnforest Glulam Finnforest ThermoWood® For more information and...