![]() How to read when the object is not placed at 0? The big long hash marks above which numbers are written on the opposite side of the centimeter ruler denote inches. The smaller hash marks between each centimeter represent millimeters.ġ0-millimeter hash marks make 1 centimeter.Īn inch is bigger than a centimeter. The long hash marks under which numbers are written on the ruler denote centimeters.Ī millimeter is even smaller than a centimeter. Here, the shoelace is 17.6 cm long in metric units of length, and 7 inches long in customary units of length.Ī centimeter is smaller than an inch. Note the hashmark on the ruler along which the other side of the object ends. Align the object you are measuring along the edge of the ruler. To measure the length of an object, place the zero hash mark of the ruler exactly along one end of the object. Short rulers are 15 centimeters which are very convenient to carry and long rulers are 30 centimeters or 12 inches long, it is useful to draw larger drawings.ĭepending on its usability, specially in the industries, rulers are also used in different formats like: Folding Ruler or Extension Ruler, Self-retracting Metal Tape, Plastic tape or a Soft Ruler. Rulers are made in many different materials like wood, plastics, and metal.ĭepending on the size of the ruler there are two types of ruler – a short ruler and a long ruler. There are different types of ruler depending on the material it is made of. The rulers are marked with standard distance in centimeters in the top and inches in the bottom and the intervals in the ruler are called hash marks. Quality assurance of Canadian lumber is achieved via a complex system of product standards, engineering design standards and building codes, involving grading oversight, technical support and a regulatory framework.A ruler can be defined as a tool or device used to measure length and draw straight lines.Ī ruler is used to measure the length in both metric and customary units. Special grade dimension lumber called lamstock (laminating stock) is manufactured exclusively for glulam. ![]() Lumber can be used directly as framing materials or may be used to manufacture engineered structural products, such as light frame trusses or prefabricated wood I-joists. The predominant use of dimension lumber in building construction is in framing of roofs, floors, shearwalls, diaphragms, and load bearing walls. The maximum length of dimension lumber that can be obtained is about 7 m (23 ft), but varies throughout Canada. Dimension lumber thicknesses of 64 and 89 mm (2-1/2 and 3-1/2 in) are generally available as surfaced green (S-Grn) only, i.e., moisture content is greater than 19 percent. Air-dried or kiln dried lumber (S-Dry), having a moisture content of 19 percent or less, is readily available in the 38 mm (1.5 in) thickness. For instance, 38 × 89 mm (1-1/2 × 3-1/2 in) material is referred to nominally as 2 × 4 lumber. Lumber can be referred to by its nominal size in inches, which means the actual size rounded up to the nearest inch or by its actual size in millimeters. Design Values for Canadian Species used in Canadaĭimension lumber is solid sawn wood that is less than 89 mm (3.5 in) in thickness. ![]() Wood design in the National Building Code of Canada.CSA S-6 Canadian Highway Bridge Design Code.
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