NLT Technical Work Begins
As part of our technical program for 2017, Canada Wood has commenced the of “Code Recognition of NLT (Nail Laminated Timber) Floor Systems” project. As this is the collaborative work with the Japan 2×4 Home Builders Association, we started by making plans for the fire tests to confirm how realistic it can be to apply sacrificial char layer design approach to NLT in the Japanese building code. The “Nail Laminated Timber Construction Guide” that was recently published by Binational Softwood Lumber Council is remarkably useful reference to make the test plan. Apart from the fire tests, we conducted a survey looking for any existing structures that have been built with NLT in Japan. We found a small building that was completed in June, 2016, at Motoyoyogi, Shibuya-ku, Tokyo. This building is a small gallery with the floor area of only 17m2, sitting just beside the
Yamanote Avenue, known as one of the heaviest traffic in downtown Tokyo. Kenichiro Arazeki, the architect, used NLT both structurally and decoratively. The NLT walls and roofs are visually exposed as the interior finishing. The NLT in this gallery was fabricated at site with SPF dimension lumber; 2x8s for walls and 2x10s for the roof. There is growing interest in NLT within the Japanese construction industry. NLT is thought to be a potentially cost effective alternative to CLT and would open up design opportunities for more exposed wood in large scale buildings.