Fine Woodworking magazines can weigh up to 40 pounds per foot.ĥ. A value of 35 pounds per running foot is used by some for library shelving. A fully loaded bookshelf weighs 20-40 pounds (9-18 kg) per running foot, or 60-120 pounds (27-54 kg) for a 3′ wide shelf. Many bookshelves have a depth of 8″ to 12″, a width of 24″ to 36″, and a thickness of 3/4″ to 1″.Ĥ. Once you have a maximum allowable sag figure in mind, you can design your shelf by tweaking the material types and dimensions. Thus, a suggested target for allowable sag is 0.02″ per foot or less.ģ. As an engineering rule of thumb, wood beams/shelves will sag an additional 50% over time beyond the initial deflection induced by the load. Expect some real-life variation from the calculated results.Ģ.The eye will notice a deflection of 1/32″ (0.03″) per running foot, or 3/32″ (0.09″) for a 3′ wide bookshelf. The deflection calculations use average wood stiffness properties of clear, straight-grained samples measured in controlled laboratory conditions (mainly from the U.S. Target sag: 0.02 in per foot (1.7 mm per m) or lessġ. Shelf Characteristicsįixed (attached to sides) Floating (not attached) You can also specify an edging strip to further stiffen the shelf. Download the design software here.The Sagulator helps you design shelves by calculating shelf sag (deflection) given type of shelf material, shelf load, load distribution, dimensions, and method of attachment. For over 10 years the program has been under progressive and continuous development of engineering design techniques and innovations.įor novice or professional, NP Design is free, quick and easy to learn. NP Design is developed by leaders in engineering design software. NP Design assists with certified specification of engineered wood products in common applications. NelsonPine® Design (NP Design) is a powerful design program for a range of user types, from builders to structural engineers and offers a range of different building levels to accommodate various user competencies. Sustainably Managed Timber NP Design – The Design Software for NZ and Australian Standardsįast, accurate beam specification for any project, domestic or commercial. In our new ‘post-quake’ consciousness, it is the building material of choice”– Professor Andy Buchanan, University of Canterbury. “Technically, LVL is one of the most sophisticated wood products ever developed for the construction sector. NelsonPine® LVL products inspire Architects, Designers, Builders and end users to realise structural applications. Our range of LVL products are designed to span further and weigh less to optimise efficiency in design and construction. Our NelsonPine® LVL is engineered from renewable and sustainably sourced New Zealand radiata pine. LVL is manufactured to achieve consistent strength, stiffness and stability. Built up with a specific sequence of structurally graded veneer sheets, the finished product displays less variability, a higher strength to stiffness ratio and more predictable performance than sawn timber. NelsonPine® LVL provides a consistent, high-performance alternative to solid lumber and steel in structural uses. Our products are used across residential, commercial, industrial, formwork and scaffolding applications. NelsonPine® LVL is available in a variety of sizes and lengths. NelsonPine® LVL is a structural engineered wood product manufactured from rotary peeled veneers, assembled with parallel grain orientation and bonded with an exterior structural adhesive.
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