When plywood gets wet, it tends to swell consistently across the sheet, and then returns to its to normal dimensions as it dries out. I'd tend to fall in the "OSB furniture sounds like a terrible idea" camp, but anyway... Two steps come to mind - one is to seal the cut edges thoroughly using either a thin epoxy or a varnish/polyurethane type of product, to both bind small slivers and prevent or at least slow moisture intake and resultant edge swelling. It was invented by Armin Elmendorf in California in 1963. On the plus side, osb is a more consistent product. Strands used for the production of test panels were made up 50% of core layer and 50% of … The densities of OSB can be found in the product data-sheets. Machining an edge-taper, 0.6 mm-deep and 10 or 20 mm-wide eliminated edge … Ainsworth. Altering panel composition and density distribution 5. Depending on the edge finish, three types of boards can be … Thanks to the ContiRoll® technology used to produce SWISS KRONO quicklyboard, swelling is negligible. EN 322. od 2 do 12% od 5 do 12%. In my current home I'm using plywood as an underlayment for new 3/4" wood floors, mainly to avoid edge swelling with standard OSB. OSB may have a rough and variegated surface with the individual strips of around 2.5 … Creating drainage channels Louisiana-Pacific’s Top Notch sub-floor panels with different coloured edge seals Louisiana … Advantages of OSB. The T&G board owes its name to its tongue-shaped edge fitting into the groove of the adjacent panel. OSB: Floor Covering vs. Subfloor . EN 323. Yes. EN 324-2. It is an economic alternative to conventional plywood for formwork. I see big trouble brewing. Some cracking of the finish and lifting of wood chips may also … OSB panels, the specifier should designate thickness, grade, span rating, bond classification, dimensions, “square edge” or “T&G” (as desired for thicker floor panels), and number of pieces. Sponsored Links; pilsbury. Oriented strand board is a multi-layer sheet formed by pressing rectangular flat chips at high pressure and temperature with exterior type resin binder. The average coefficient of hygroscopic thickness swell is about 0.01 inch per inch of original thickness for each 10 percent change in equilibrium … The AdvanTech ® pieces (right stack) soaked in the same amount of water but remain dimensionally stable. OSB is commonly used in constructions for floor underlayment’s, walls and roofing. 12-08-2009, 06:28 PM desertsun41 : Location: Houston, Texas. The construction industry has approved OSB as a substitute for plywood. ... the possibility of shrinking and swelling due to variations in humidity is highly reduced.Raw material and technology determine the quality of a panel of engineered wood such as I-PAN OSB… Job-site handling • OSB panels lie flat and are engineered for consistent quality without knots or voids. "We are having a home built and OSB boards were used for […] Performance • As structural panels, plywood and OSB are designed to meet the … Astramax Screwfix Select. Wood scientists agree that the structural performance of plywood and OSB are equivalent. 2 Manufacture 2.1 The board is manufactured to the specification detailed in BS EN 300 : 2006 for OSB/3, relating to loadbearing oriented strand boards used in humid conditions. It’s here that plywood has the edge. That was a pain, too, because the swelling resulted in a wavy, bumpy floor that contributed to the squeak problems. Typically, the swelling happens at the edges where the cut strands are … Increased levels of wax 4. We also had a fair amount of edge swelling — an inevitable result of rain during the framing stage before we got the house dried in. SWISS KRONO OSB/2 - board with load transfer properties, suitable for applications in dry conditions. But of course that edge seal is lost when panels get cut on site, as they … Swollen edges have been known to telegraph visible ridges called "ghost lines" through asphalt roof shingles. Edge straightness tolerance. Oriented strand board (OSB) is a type of engineered wood similar to particle board, formed by adding adhesives and then compressing layers of wood strands (flakes) in specific orientations. Quick Column Summary: OSB roof boards swelling Pull off or cover over OSB OSB can swell and still be good Question builder on delays Steve, who's having a house built in Ann Arbor, Michigan, has a questionable builder. Each product has their merits and appropriate uses. OSB, or oriented-strand board, is an engineered wood material sold in sheets like plywood. The first panel is installed at the side of the home, with the long edge flush with the corner of the building, and the bottom edge flush with the sill. Is the density of the OSB variable with the thickness of the boards? It dries out relatively quickly, and the swelling is usually not enough to affect floor or roof finishes. The objective of this research was to optimize the dimensions of machined tapers (bevels) at the edges of oriented strand board (OSB) to reduce the differential edge swelling (edge-flare) that causes problems when OSB is exposed to water. So finally OSB … Edge swelling is common when exposed to moisture; Sometimes made from wood species with poor rot … thickness as it dries, while OSB swelling is irreversible. Manufacturers insist that OSB's moisture problems have been corrected, thanks to the development of water-resistant edge seals. Traditional OSB vs. AdvanTech Panels. OSB has the appearance of giant cornflakes pressed together to form structural panels in sizes similar to plywood, such as 4' x 8' x 5/8". 1.5 mm/m. Plywood, on the other hand, resists edge damage better and weighs less than OSB. The grained surface of the boards leaves an attractive imprint on concrete. This differential edge swelling of OSB, hereafter called edge flare, is a problem when panels are used as an underlay for floor coverings because the edges of panels protrude above the surface of the sub-floor and costly on-site sanding is required to level panels before the application of flooring [4] . Edge square or tongue-and-groove Finish sanded or unsanded. Swelling of panel edges and uneven swelling of individual wood particles or chips may be expected on OSB sheathing panels exposed to high moisture condi-tions. Since its introduction, tens of thousands of homes have been built using Stabledge and it continues to be the panel of choice for builders who want to build … Straight edge. Although OSB 3 is water resistant, once water gets into the edges and stays there, the boards will start to deteriorate sospan, Apr 5, 2017 #2. c j beattie New Member. Both are strong, durable and long-lasting. The special strand geometry and strand orientation in the surface layers, as well as the low-emission glueing, ensure the … OSB is cheaper and has better shear strength. Plywood, although not immune, is somewhat forgiving. 10,424 posts, read 46,064,922 times Reputation: 10436. 4 2) Moisture content OSB 1, OSB 2, OSB 3, OSB 4. Hmmmm ok. 5 3) Allowable density tolerance in relation to the average density inside board. The product standard for OSB (EN 300) does not provide any requirement value for density. Weyerhaeuser Hardwood Edge OSB Holds Off Moisture, Squeaks ... Issues including swelling and shrinkage of natural wood, improper acclimatization of hardwood, and insufficient drying time for damp OSB can combine to cause loosened fasteners, which in turn lead to pops and squeaks in a finished floor. Plywood actually gets saturated much faster than osb, but it is not prone to edge swelling and it dries out much more quickly. 2.0 mm/m. Reducing Edge Thickness Swelling of OSB Sub-Floor Products 1. All of test panels were bonded with phenol-formaldehyde resin at (6%) with three-layer cross-aligned OSBs. Edge seals 2. OSB (Oriented Strand Board) is an engineered wood-based panel consisting of strands of wood which are bonded together with a synthetic resin; the strands are pressed together in layers. The values are 95 percentiles (5 percentile values in the case of swelling in thickness) … How to Sand OSB. It is truly … Although OSB panels are rated "Exposure 1" for normal construction delays - which includes getting damp or wet - they can swell if the edges absorb enough water. I-PAN OSB board is made of layered poplar strands which are bonded and pressed at hot temperature, in compliance with EN 300. Floor covering (or finish floor) is the term for the topmost, eventual floor--the floor that you walk on and see. Their range: OSB 2 ≥ 580 kg/m 3, OSB 3 ≥ 600 kg/m 3, OSB 4 TOP = 600-640 kg/m 3 . Osb, in its current state of development, is more sensitive to moist conditions. OSB (Oriented Strand Board) Description. Plywood is not prone to edge swelling like OSB. SWISS KRONO OSB/3 - board with load transfer properties, suitable for 1-2 usage class according to PN-EN 13986 applications in moderate humidity conditions. Permanent edge swelling of an OSB sub-floor panel sample after it was floated on water for 72 hours and then re-dried (photo c/o author) Fig 4. Stabledge is a premium engineered wood product ideally suited to sub-floor applications. Floor squeaks are the result of … Thanks garyo, 31 Aug 2018 #1. More cost effective; 2x greater shear strength than similar sized plywood (Source: University of Massachusetts) Meets most building codes for roof and wall sheathing; Disadvantages of OSB. OSB is installed vertically over the entirety of the exterior. c j beattie, Apr 5, 2017 #3. If edge swelling occurs, the OSB stays flat at the seams. Will it stay that way or will it pull back in as it dries out, or is it that thickness for good now? Commodity OSB (left stack) starts out at 3/4-inch thick, but after soaking in water, it swells. OSB had reputation of edge swelling when exposed to moisture, but that issue was address several years ago … OSB boards square edge Strong and sustainable EGGER OSB boards are multilayer boards with a three-layer structure of micro-veneers, so called strands, which are approved for load-bearing construction. OSB takes longer to get wet than plywood but also … 3 2)3) Squareness tolerance. Do not allow the OSB to extend past the sill plate, as this will cause it to wick up moisture and to potentially swell. 10%. Premium level PointSix Durastrand Flooring also carries a limited … For example: 7/16-inch SHEATHING SPAN, 24/16 Exposure 1, 48 x 96 inches, square-edge, 200 pcs. will exterior caulk not do the job or what do you suggest? ... Hardwood Edge … This type of joint ensures easy and fast assembly and substantially … Using pMDI resin to replace PF resin 3. For panels of balanced construction, edge swelling could reach a maximum of about 0.002 inch at each edge for each 10 percent increase in equilibrium relative humidity above 40 percent. OSB stands for oriented strand board. This can cause a rough, uneven surface that may detract from the appear-ance of smooth panels. 6 4) Formaldehyde content – class 1 … This study was carried out to determine the effects of using cast-polyamide on the thickness swelling (TS) of oriented strand board. We still had frequent callbacks for squeaks. (1) Other sizes are available on request. Engineered to accommodate the effects of swelling due to moisture, PointSix OSB Flooring has a patented tapered-edge technology in which 0.6 mm of material is milled off at the edge. As you can see, both OSB and plywood sheathing are good options for the construction of structural sub-floors. EN 324-2. Joined: 21 Oct 2014 Messages: 1,473 Thanks Received: 192 The edge 30mm of some 18mm OSB has swollen out marginally to 20mm because of some rain. No matter what the weather throws at you, Stabledge ® holds the line on edge swell. 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