Although not yet seen as common practice, building with cross laminated timber (CLT) is gaining momentum in North America. Behind the scenes of the widely publicized project initiatives such as the Wood Innovation Design Centre Building in Canada and the recent U.S. Tall Wood Building Competition, substantial research, engineering, and development has been completed or is underway to enable the adoption of this innovative building system. This paper presents a brief overview of the current status of CLT building development in North America, highlighting some recent U.S. and Canadian research efforts related to CLT system performance, and identifies future CLT research directions based on the needs of the North American market. The majority of the research summarized herein is from a recent CLT research workshop in Madison, Wisconsin, USA, organized by the USDA Forest Products Laboratory. The opportunity and need for coordination in CLT research and development among the global timber engineering community are also highlighted in the conclusions of this paper.
Cross laminated timber (CLT) is a new engineered wood product that has experienced rapid growth and market acceptance for residential and non-residential construction in western and central Europe. Potential exists for rapid market adoption in North America if manufacturing capacities are developed...
Cross-Laminated Timber (CLT) is an innovative structural system based on the use of large-format, multilayered panels made from solid wood boards glued together, and layers at 90 degrees. This cross-laminated configuration translates into panels that are monolithic, stable, and experience minor shrinkage, which allows them to be used for the most diverse building applications, such as walls, floors and roofs. Developed in the early 1990 in Switzerland, as a way to reduce waste in sawmills, the system has been successful in Europe for the past 20 years, and more recently has made inroads into the Australian and North America markets. In the United States, the adoption of the system is still in its early stages. Recent research has shown that CLT could be cost-competitive as an alternative to concrete structures and for buildings over 6 stories high. The main goal of this study was to understand the market impediments to widespread adoption in the U.S. from an architecture firm’s point of view and compare the economic performance of CLT with that of traditional constructions systems, namely concrete and steel. A performing arts facility on the west coast of the US was evaluated as a case study. In order to accomplish this goal, a series of interviews with building professionals, as well as meetings with construction and estimating firms were conducted. Then an in depth analysis was performed to evaluate and compare the economic performance of the different construction systems in terms of cost of materials, labor, and speed of construction. This research addresses some of the key questions that must be answered if we are to understand the viability of a CLT market in the U.S.
This paper presents a design method for multi-story timber building with consideration of regulatory constraints. The objective is to optimize in the same time thermal, structural and environmental objectives taking into account the industrial feasibility. To set up this method and the appropriate tool a study case is developed and will be implemented.
The current interest and growth of cross laminated timber (CLT) products has spurred interest in the manufacture of CLTs in the United States. The purpose of this paper is to explore the development of CLT materials from southern pine lumber commonly available in Virginia. A 5-layer CLT panel has been constructed using No. 2 southern pine lumber. Evaluation of mechanical properties, fire performance and acoustical performance were conducted. Results of these evaluations can guide the development and acceptance of CLT products in the International Building Code.
Due to the high volume of timber required for manufacturing, the production of cross-laminated timber (CLT) panels could be an appropriate destiny for the existing surplus of pinewood presently available in Uruguay. Although wood construction is uncommon in this country, there are some companies with the capacity to adapt their production to new products such as CLT. This work evaluates the properties of CLT panels manufactured in Uruguay with local pine (Pinus taeda and Pinus elliiottii) from forest plantation thinning, which typically present low mechanical properties. Boards and panels were mechanically tested and the mechanical properties were determined, showing a strength class lower than C14. A numerical model, using the finite element method, was developed and the numerical results were compared with the experimental values. The results provided a first approach to the conditions and limitations of the use of CLT panels for building floors, produced under the current manufacturing conditions in Uruguay.
European Conference on Cross Laminated Timber (CLT)
May 21-22, 2013, Graz, Austria
Cross-Laminated Timber (CLT) is an innovative wood product, which can be used for almost all superstructure elements. It is generally produced from kiln dried, fast growing timber. Currently the majority of CLT used within the UK construction industry is manufactured in central mainland Europe and imported to the UK. The goal of this study is to establish the conditions required for implementing a CLT production and construction capability using available UK timber stock, thus offering a low carbon alternative to multi-story steel and concrete commercial constructions.
Almost half of Brazil's area is forest. Technologically manipulated and protected from natural disasters caused by fire, insects and diseases, forests will last forever. As older trees are removed, they are replaced by new trees to replenish the wood supply for future generations. The regeneration cycle, or support field, can easily overcome the...