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​Q & A

1.              Vibration design

Q: I am designing a floor element and cannot find solution that fulfils the vibration requirements.

A. Kerto LVL-S beams could be investigated for a potential alternative. They are available in many cross-section sizes and vibration could be fulfilled with a minimal material consumption. You can look for more information from Metsä Wood website, datasheet and in Kerto manual.

http://www.metsawood.com/global/Products/kerto/Pages/Kerto-S.aspx

Kerto LVL S-beams datasheet

http://www.metsawood.com/global/tools/materialarchive/materialarchive/metsawood-kerto-s-english.pdf

Kerto Manual

http://www.metsawood.com/global/Tools/kerto-manual/Pages/Kerto-manual.aspx

 

2.              Wood-based plate with fire resistance requirement "R"

Q: I am searching for a fire-resisting pane with separating function fulfilling a requirement of 30 to 60 min.

A: Kerto-LVL Q panel could be investigated. With base thicknesses from 27 up to 75 mm, it can fulfil a wide range of requirements with optimized thicknesses, for both separating and load-bearing floor panel. The Resistance to fire (R30 or R60) is calculated according to EN 1995-1-2.

You can look more information from Metsä Wood website, datasheet and in Kerto manual.

https://www.metsawood.com/global/Tools/MaterialArchive/MaterialArchive/kerto-manual-lvl-Q-panel.pdf

And about fire resistance:

https://www.metsawood.com/global/Tools/MaterialArchive/MaterialArchive/Kerto-manual-lvl-fire-resistance.pdf

Finnwood can be freely downloaded from

https://www.metsawood.com/global/Tools/Finnwood/Pages/default.aspx

 

3.              Studs

Q. Can Kerto LVL be used as studs for partition walls, as an alternative to steel?

A. Yes, Kerto-T is the right material for that. It is straight, light, dimensionally stable and easy to cut-to-size. Installation is fast on a stiff and sustainable support.

You can look more information from Metsä Wood website:

https://www.metsawood.com/global/Tools/MaterialArchive/MaterialArchive/Kerto-manual-lvl-columns-studs.pdf

 

4.              Lintels

Q. I'm designing a lintel for garage door with demanding deflection criteria. Is LVL a good solution?

A. It could be, since Kerto LVL S-beams have very high modulus of Elasticty and you'll gain important millimeters in the design, with less material consumption and keep the flexibility in opening positions. Finnwood is a software tool that could help you precisely design these lintels.

You can look more in Kerto-LVL S datasheet:

https://www.metsawood.com/global/Products/kerto/Pages/Kerto-S.aspx

Finnwood can be freely downloaded from

https://www.metsawood.com/global/Tools/Finnwood/Pages/default.aspx

 

5.              Multiple-glued bottom chord

Q. In a 5-storey building, the bottom chords do not have load-bearing compressive capacity enough to resist the load from studs. Is there a LVL solution?

A. A multiple-glued Kerto-LVL Q section could be investigated. With high performances in compression perpendicular to the grain, it allows higher levels of loads without embedment of studs in the chord, making both building and design more reliable.

You can look more in Kerto-LVL Q datasheet:

https://www.metsawood.com/global/Tools/MaterialArchive/MaterialArchive/Kerto-manual-lvl-mechanical-properties.pdf

 

6.              Higher thicknesses

Q. I saw that standard thicknesses range of LVL is up to 75mm. Are there possibilities for Kerto-LVL to get thicker products?

A. It is possible to multi-glue Kerto-LVL panels to reach higher thicknesses opening a wide range of possibilities for this product: bracings panels with high horizontal loads, columns with high load-bearing capacities. This product is a simple solution for multi-storey buildings.

You can look more information from Metsä Wood website and Kerto manual:

https://www.metsawood.com/global/Tools/MaterialArchive/MaterialArchive/Kerto-manual-lvl-multiple-glued.pdf


7.              Bracing wall

 

Q. I'm designing a timber-frame bracing wall in a windy area, and I don't find any standard panel to fulfil the requirements. Is there a solution in LVL?

A. Yes, Kerto LVL can suitably replace standard solutions where higher requirements are expected. The installation process remains the same, but higher loads can be transferred. The wall is then stronger, stiffer, and large panel make the process quicker and more efficient. In addition, the vapour resistance of Kerto LVL panel can be considered in moisture transfer analyse of the wall, if needed.

You can look more information on Metsä Wood website and Kerto Manual:

https://www.metsawood.com/global/Tools/MaterialArchive/MaterialArchive/Kerto-manual-lvl-mechanical-properties.pdf

https://www.metsawood.com/global/Tools/MaterialArchive/MaterialArchive/kerto-manual-lvl-Q-panel.pdf

And for moisture transfer:

https://www.metsawood.com/global/Tools/MaterialArchive/MaterialArchive/Kerto-manual-lvl-moisture-behaviour.pdf

 

8.              Moisture transfer

Q. I'm planning to use LVL panel as bracing in timber-frame wall, on the internal layer of external wall. Do I still need to add additional water vapor barrier?

A. It should be analysed in detail. LVL has a certain resistance to moisture transfer throughout its thickness, and more generally depending on direction of the grain in relation to transfer direction. It also has insulation properties. In some cases you can leave the water vapour barrier, and have some benefit from the insulation property of the Kerto LVL in the thermal performance of the wall.

You can look more information on our website, in the following cards:

https://www.metsawood.com/global/Tools/MaterialArchive/MaterialArchive/Kerto-manual-lvl-moisture-behaviour.pdf

 

9.              Thermal properties

Q. What is the contribution of Kerto LVL to global insulation performance of a wall?

A. Kerto-LVL, as every timber-based product, has thermal properties that can be advantageously considered in the evaluation of global thermal performance of a wall.

https://www.metsawood.com/global/Tools/MaterialArchive/MaterialArchive/kerto-manual-lvl-thermal-properties.pdf

 

10.              Curved structures

Q. I'm designing a curved roof and I need a flexible panel that can be adapted to the curvatures. Is LVL suitable for such application?

A. Depending on the radius of curvatures, Kerto-LVL Q solution could be explored. The thin panels (from 21 mm) are available for Kerto-LVL and will allow small radii of curvature and flexible shapes with few joints, due to large panel size. The edge profiling is also possible, allowing smooth transitions between panels.

You can look more information on our website:

https://www.metsawood.com/global/Tools/MaterialArchive/MaterialArchive/Kerto-manual-lvl-curved-structures.pdf

 

11.              Diaphragm

Q. I'm designing a Kerto LVL Q-panel diaphragm for a large roof, that will remains outside before roofing phase. How can I protect the panel?

A. It is possible to apply a weather protection on the panel, that will slow the absorption of rainwater, still remaining opened to water vapour. In addition or in parallel, Mouldguard coating brings protection against mildew and blue stain. These options could make you save the temporary protection, ensure your construction phase and improve the visual quality of the product.

You can look more information on our website:

https://www.metsawood.com/global/Tools/MaterialArchive/MaterialArchive/kerto-manual-lvl-surface-treatment.pdf

 

12.              Holes in beam

Q. How big can be the holes in Kerto-LVL beams? And how to design these holes?

A. It is possible to make holes and notches to Kerto-LVL beams. Kerto-LVL Q is particularly suitable in some cases, since cross-veneers reinforce it to tension perpendicular to grain. Then large holes and notches can be designed and with lower reduction of the load-bearing capacity in comparison with more ordinary timber products and no additional reinforcement is needed.

You can look more information on our website:

https://www.metsawood.com/global/Tools/MaterialArchive/MaterialArchive/Kerto-Manual-lvl-holes-and-notches.pdf

And in our VTT certificate:

https://www.metsawood.com/global/Tools/MaterialArchive/MaterialArchive/Kerto-VTT-C-184-03-Certificate.pdf

 

13.              Visual properties

Q. I would like to leave a Kerto panel visible in a large room. What kind of aspect can I expect from Kerto-LVL?

A. The visual appearance of Kerto LVL is showing peeled veneer from Nordic conifer timber, due to the way LVL is produced. Sanding is an option to improve visual quality and smoothen the surface. Also, some protective treatment might bring an improvement as well.

You can look more information on our website:

https://www.metsawood.com/global/Tools/MaterialArchive/MaterialArchive/Kerto-manual-lvl-visual-properties.pdf

And some references can be consulted at:

https://www.metsawood.com/global/Products/wood-construction/Pages/default.aspx