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Moisture performance characteristics of OSB and spruce plywood exterior sheathing products
Published in Paul Fazio, Hua Ge, Jiwu Rao, Guylaine Desmarais, Research in Building Physics and Building Engineering, 2020
Tuomo Ojanen, Jarkko Ahonen, Carey J. Simonson
OSB (Oriented Strand Board) and plywood are typical sheathing boards that are composites of timber, glue and possible wax and they are meant to be used also as exterior sheathings. Compared to plywood, OSB is a relatively new product that has lower requirements for the timber raw material than plywood. Due to economical reasons, the use of OSB has been highly increasing. OSB has typically wax at least on the surface layers to protect the board against water absorption during the building process. Plywood products meant to be used as exterior sheathing are typically made of spruce.
Woods
Published in M. Rashad Islam, Civil Engineering Materials, 2020
Oriented Strand Board (OSB). OSB refers to a mat-formed wood structural panel comprising thin, rectangular wood strands arranged in cross-aligned layers, with surface layers normally arranged in the long panel direction and bonded with waterproof adhesive, as shown in Figure 10.22. The individual layers can be cross-oriented to provide strength and stiffness to the panel. The wood strands in the outmost layer on each side of the board are normally aligned into the strongest direction of the board. Produced in enormous, continuous mats, OSB is a solid panel product of consistent quality with no laps, gaps, or voids (APA 2017).
Carbon Management
Published in Subhas K Sikdar, Frank Princiotta, Advances in Carbon Management Technologies, 2020
OSB is another engineered structural product, manufactured from thin strands of wood glued together with adhesive under heat and pressure in specific orientations. Wood strands are 100 mm long and 1.2 mm thick and dried to a moisture content of 6–8% before they are bonded together with resin base adhesive (Alldritt et al., 2014). OSB is largely used for wall panels, beams, I-joist webs, floor sheeting and roof panels (Mekonnen et al., 2014). OSB was originated and first produced in the early 1980s in North America. The production of OSB grows originally from 719,000 m3 to significantly 26,632,305 m3 in 2014 in North America (Jin et al., 2016). OSB is typically made from low-density trees, such as aspen or southern yellow pine, that are relatively fast-growing species. Other types of strand boards such as OSL, LSL and PSL are also manufactured from wood strands in a similar method by bonding with resins under high pressure (Cai and Ross, 2010).
On-site comparison of the OSHA 47, Asset EZ4-NCO, Iso-Chek, DAN, and CIP10 methods for measuring methylene diphenyl diisocyanate (MDI) at an oriented-strand board (OSB) factory
Published in Journal of Occupational and Environmental Hygiene, 2020
Simon Aubin, El Mekki Hamdi, Audrey Joly, Philippe Sarazin, Jacques Lesage, Livain Breau, Mark Spence, Sébastien Gagné
Area sampling was conducted in one OSB factory located in Quebec, Canada during normal operations. During OSB production, dried wood strands were coated with a resin made of pMDI Rubinate1840/Phenol-formaldehyde polymer resin (85%/15%) in an enclosed rotating blender system. The study was conducted using area samples positioned near a forming line, where coated wood strands are transported by conveyors to the forming bins, from which the strands then fall onto a conveyor to form the mat. The main remaining steps of the process are the pressing, trimming, and cutting. This automated process runs 24-hr each day. The fall of the strands on the conveyor can result in the generation of MDI coated wood particles, and engineering controls were applied (ventilation and containment) to reduce the exposure. Nevertheless, past MDI monitoring data obtained at this factory demonstrated measurable MDI concentrations at the forming line hence the selection of this sampling location. Due to sampling setup configuration (Figure 1) and safety considerations, the sampled air was taken as near as possible from the source at approximately 1.5 m above the mat on a platform right above the end of the forming line. This area was restricted, and all persons within the area had to wear individual protection: full-face respirator equipped with P100 filters/organic vapor cartridges, coverall, nitrile gloves, earplugs, and hard cap boots. As specified in methods to prevent further isocyanate curing, post-sampling sample and field blank treatment was performed right next to (approximately 3 m) the sampling location, within the restricted area. The production was stopped a few times for short durations (5–15 min) during Day 3 due to process equipment malfunctions.
Design strategies and energy performance of a net-zero energy house based on natural philosophy
Published in Journal of Asian Architecture and Building Engineering, 2020
Feng Shi, Shaosen Wang, Jinjin Huang, Xiaoqiang Hong
As a traditional Chinese building material, wood is widely used in China and easy to build. To make it easier for the students to build the house, and to avoid thermal bridges, the whole structure is made of wood and OSB panels, which are natural, recyclable, nontoxic, carbon-sink materials. Birch plywood is used for interior finishes, which is more environmentally friendly than PVC materials for a prefabricated building.