Ontario building code ceiling joist span tables

The classification, grade, and bending strength help determine use within a structure. and Canada for dimensional lumber used in the building industry and include light framing, structural light framing, studs, structural joists and planks, and appearance. Stress-grade lumber classifications are standardized across the U.S. Grades of wood classifications include appearance (how pretty regardless of strength), non-stress (not for structural requirements), and stress grades (for structural use). Lumber is divided into different grades based on the number and location of knots and other imperfections in the wood, and its bending strength. Douglas fir-larch is stronger than spruce-pine-fir (SPF) and will span further when other factors are the same.

The species, type, or kind of tree determines the structural strengths of the timber and impacts support, flexing, and compression abilities. #1 Southern pine floor joist may span 16вЂ™, exceed 26вЂ™ as a ceiling joist, or run 13вЂ™-6вЂќ as a rafter. A #1 Southern pine beam may span 5вЂ™-1вЂќ as a single, or 7вЂ™-7вЂќ when doubled, or 9вЂ™-6вЂќ when tripled. The span differs when used as a beam, floor joist, ceiling joist, or rafter. The use or location affects how far a 2Г—8 will span. The end-tag or grading stamp identifies grading association, mill, grade designation вЂ“ select structural (SS), construction (#1), standard (#2), or utility (#3) вЂ“ species, seasoning вЂ“ MC15, KD-15, S-DRY, KD or S-GRN вЂ“ and dimensions. There are different factors that affect how far a 2Г—8 can span, including use or location, species of wood, grade, the spacing between joists or rafters, and load. What Factors Impact How Far a 2Г—8 Can Span? The roof span is the distance from outside bearing wall to outside bearing wall measured horizontally from outside top plate face to outside top plate face. Rafters span from the top plate to ridge board or beam but may have intermediate support from purlins and braces, collar ties, or raised rafters. The span determines the location of structural supports and the size of the clear or unobstructed spaces in a building.ДЇloor joists span from wall to beam or wall to wall with supports spaced to optimize the strength of the building material used, or to determine the materials to be used. It is commonly measured from the center of one support point, such as a wall, beam, purlin, or ridge to the center of the next support point. Span is how far a structural piece can traverse before it needs to be supported. It is used by both the United States and Canada as the foundation of their building codes and will be referenced within this article. The International Residential Building Code (IRC) of 2018 identifies the spans for joists, beams, headers, rafters, and roofs. The distance is determined by many factors and conditions. In the construction world, span is a word used to mean the linear distance a board, joist, rafter, or roof must bridge or cover without bending or requiring support. How Far Can 2Г—8 Ceiling / Floor / Deck Joist Span?.How Much Weight Can a 2Г—8 Support Horizontally.What Factors Impact How Far a 2Г—8 Can Span?.

Ontario building code ceiling joist span tables