The following sections provide information on CLT detailing. Listed below are some of the recommended details. When using CLT as a building material, exposed faces, edges, and joints need to be treated. Details at these areas include exposed corners and joints, as well as rough openings and voids. Refer to Detail 14a and 14b for details on panel joints. Once these areas are treated, they should be painted or coated. The following sections detail the details for CLT panels.
Cross-Laminated Timber (CLT) is a mass timber building material composed of several layers of dimension lumber. These panels are often used for walls, roofs, and floors. Proper CLT detailing is vital for mass timber structures. Practical connection details are both easy to manufacture and cost-efficient. Improper connection details can make a structure overly difficult and expensive to construct. In addition to ensuring accurate CLT BIM modeling, proper detailing of connections ensures the best outcome.
While many of these connections are hidden by the timber-bearing elements, CLT connections can be detailed with little more than the screw heads exposed. This is especially important if the connection points are exposed and the building is intended for fire resistance. Get Bridge Detailing now. Exposed steel hardware is visually unattractive and does not have the proper fire-resistance rating. Properly detailing CLT connections will ensure that exposed steel does not compromise the structure’s fire resistance rating.
In addition to exterior appearance, CLT also performs well in interior spaces. Unlike concrete, CLT panels are lighter than equivalent masonry structures. Therefore, they are a cost-competitive alternative for buildings up to six stories. The crosswise design of CLT allows it to span in two directions. The structural stability of CLT is comparable to that of concrete. And its low weight means lower foundation costs. Additionally, CLT structures are faster to assemble and can be installed in any season.
Although CLT is a relatively new product, some projects have already used it. While it’s not a widely used material, it can be used to enhance the appearance of any building, including skyscrapers. This material is also renewable and does not require fossil fuels for its production. There are many advantages to CLT detailing. The main one is that it is strong and durable, so the design can be incredibly varied. If CLT is used in an interior, it may be ideal for a high-end residential project.
While moisture uptake occurs slowly, the main consideration in CLT detailing is the protection of the material from excessive moisture. When CLT is not properly protected from moisture, it can lead to dimensional changes, microbial growth, and general deterioration of the enclosure components. A good practice is to pre-apply membranes and treat penetrations and joints to reduce exposure times. However, a good practice is still to remove ponded water over vapor-permeable membranes.
CLT is resistant to fire because of the charring. This char preserves the strength of CLT and slows down the burning process. The charring also provides a time window for occupants to escape the building safely. You should get in touch with Dowco to get Rebar Detailing. Typical CLT construction uses load-bearing walls and panels for floors. The use of panels in CLT construction also compartmentalizes the fire and minimizes its spread. There are many benefits to CLT detailing, including fire safety.
Another consideration is the roof. CLT panels are particularly sensitive to ponded water during construction. To protect the panel against moisture, a vapor-permeable AB membrane is often applied over the CLT panels. This membrane provides water-resistive properties, which facilitate drying and prevent the panel from being damaged during reroofing activity. Proper CLT detailing and proper drainage is essential. The following are some helpful tips for CLT detailing.
As a building designer, it’s important to consider how the mass timber will be protected. Deflection devices may be used to intercept moisture sources at the building exterior. Preservative treatments are also available to help protect the mass timber. The CLT Handbook provides information on preventing and controlling moisture intrusion. In the case of mass timber elements, a moisture management plan can help the CLT assembly manage in-service loads and reduce construction time.