FWPA Building Innovations

Leno – Massiv Timber Systems

Leno®-Massiv timber systems involve massive elements (plates) created with fingerjointed long boards which are glued together in several layers. As in plywood, the grain direction of the layers is perpendicular to the neighbouring layers. With the use of Massiv elements for the whole house (wall / floor / roof) a system for high air-borne noise resistance and heat control, inner climate control and fire resistance is realised.
The panel thickness ranges from 51 to 297mm giving a spread of flexural capacities. The panels can be effectively used for structural floors and less stressed elements such as walls. This system has genuine 2-way capacity with good randomisation of defects in the timber.

Benefits

The system is flexible to use since the massive timber elements, in which the grain directions are in perpendicular directions, allow for window and door openings. The benefit of different grain directions also decrease swelling and shrinkage. The details are standardised by the manufacturer. The system is pre-fabricated and so, less sensitive to degradation onsite. Because the system supplies floor, wall and roof solutions, only one supplier is necessary and economies of scale are improved for the supplier. The thickness of timber provides low thermal conductivity. The system is most likley best applied to multi-storey construction.

Limitations

The system is flexible to use since the massive timber elements, in which the grain directions are in perpendicular directions, allow for window and door openings. The benefit of different grain directions also decrease swelling and shrinkage. The details are standardised by the manufacturer. The system is pre-fabricated and so, less sensitive to degradation onsite. Because the system supplies floor, wall and roof solutions, only one supplier is necessary and economies of scale are improved for the supplier. The thickness of timber provides low thermal conductivity. The system is most likley best applied to multi-storey construction.
This is a solid timber system which would require careful thought if chases and openings were cut for services - false ceilings and floor plates are shown in some details.
Currently made up from Spruce glued with "melamine" (MUF) or polyurethane. Offgassing issues would need to be addressed for local manufacture.

Comments

This system uses very large volumes of timber which, if it was suitable for utilizing low grade plantation softwood, could have potential for development in Australia providing cost issues were addressed. Consistent with this, large volumes of timber locks up much carbon making it useful in meeting environmental sustainability criteria. Even so, from a structural perspective, the timber in the central region of the section is largely wasted.
This softwood, cross-laminated panel system is similar to offerings by KLH and Binderholz. There is good technical data for structural design. Could be suitable for 3 level construction or taller buildings.

Website

www.finnforest.de

Back

Browse Technology Resources By Category

About FWPA

Forest and Wood Products Australia Limited (FWPA), a not for profit company, is the Australian forestry and wood  products industry’s service provider, investing in research and development, and providing research results and generic promotions to the Australoian industry. FWPA aims to improve the competitiveness and sustainability of the Australian forest and wood products industry through innovation, investment in effective and relevant R&D and communication of the results to stakeholders. Read more about FWPA at www.fwpa.com.au

Contact FWPA

Forest and Wood Products Australia
Level 11, 10-16 Queen Street
Melbourne VIC 3000 Australia

Phone: +61 3 9927 3200
Fax: +61 3 9927 3288
Email: info@fwpa.com.au