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August 2021 #13265 Page #86
The Evolution of Glued Trussed Joists By Tuomo Poutanen, PhD Professor, Patent Attorney
-joists dominate the joist market due to their high material efficiency and low manufacturing cost. However, this product has disadvantages, including difficulty in HVAC installations and the possibility of bottom chord support only. Therefore, the market would pay a considerable premium for a product with crosswise openings and adaptable support. The glued trussed joist is such a product. It is even more material efficient than the I-joist and, in automatic assembly, the manufacturing cost is almost the same as an I-joist.
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Glued trussed joists were developed in Germany some 60 years ago when two joint concepts were introduced, DSB and PERI. The DSB joist was simple – the joint fingers were not tapering and the webs were not connected to each other. The product was on the market for only about 20 years.
Figure 1. The DSB joint.
The PERI joist is like the DSB joist, but there is a finger joint between the webs. The PERI is used as a joist for concrete molding. In fact, the PERI is still exploited extensively on the market.
Figure 2. The PERI joint. PHONE: 800-289-5627
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