Dimension lumber and other parameters about which you need to know

What are

lumber sizes is hard to dispute that any timber made of hardwood and softwood trees.Much more interesting to follow the laws, or rather, the standards and norms, taking place in the production of wood products industry.Let's start with the logs of the original material.

call logs typically formats with a diameter of at least 14 centimeters and a length of 4 meters or more.The log is split into quarters and plates, Lejeune and slabs, it is simply sawing.Cut logs with 4 slabs, can be obtained as a result of squared timber.The length of each of these elements for the most part corresponds to the length of the log, the width of the line depends on the crop.

more complex and demanding section calculation: untrimmed planks and boards, which are divided into thick and thin.Bruce can be sawn into smaller bars or on-edged boards, timber without sipped slabs - just edging boards. Sawn softwood rarely longer than 6.5 meters, and from hardwood - longer than 5 .

However, if necessary, by special order, you can get the boards or beams up to 9 meters.Other dimensions of lumber are usually defined product mix, according to the diameter of the upper cut logs.Lumber, which are planed to become thinner and have 4 to 6 millimeters (for boards), by removing from each surface 2 and the side faces by 3 millimeters.

What should be the weight of the timber

For the most part the weight of sawn timber depends on the wood.So, for example, pine is quite heavy due to their impregnating resin, although after steaming and rendering the latter become much easier.Oak is heavy in itself, because of the high density, and hazel - very light wood.

In general, it is accepted to measure the weight of the wood products industry in cubic meters.For example, on average, a cube with dimensions 2,5h10h580 board weighs 600 kg centimeters, without correction for the type of wood.Such boards in the cube will be 66 pieces, again without regard to breed.Weight

timber depends on humidity and wood, as well as factors such as voids in the structure, tar, etc.

As for timber, the same amount will weigh with the size of a cubic meter 5h5h580 centimeters when the number of 66 pieces, or 5h10h580 centimeters in the amount of 33 pieces.In general, any timber that can be stacked end to end, will weigh equally in different dimensions, but in different quantities.

For example, 25h30h580 timber per cubic meter will be only 2 pieces (actually 2.2, but the manufacturer always reduces down), with a total weight of 600 kilograms.If we take the type of wood, the cubic meter of raw pine weighs 890, and dry - 470 kg, which is almost 2 times better.Cube raw spruce weighs 790 kg, and dry, with regard to the remaining resin fibers, - 450 kilograms.

density lumber and that depends on it

matter what the density of lumber, many depend on their characteristics, including strength.However, the very density is directly dependent on the type of wood and its moisture content (which varies depending on the season).This cracks do not affect the density of wood, however, significantly reduce the strength, and generally pretty swirls increase density in some areas .

In general, the density of the wood is of three types, if we take the humidity 12%: a high density at 750 kg / m3 or more, the average density of 550 to 750 kg / m3 and the lowest density of 540 kg / m3 or less.Considering

rock individually, though fir moisture percentage that is taken by us as a standard to have a density of 445, and in the dry state - 420 kg / m3, while the density conditional 360. Conditional density is the ratio of the maximum weight of the wood indry condition to its volume at the maximum saturation of moisture.

Birch, for example, has the highest density after oak and beech at 12% humidity - 630 kg / m3 (oak same parameter has the value 700, and beech - 650), in a dry state its density is 600, and the conditional- 500, which is a significant difference.Thus, everything depends on the individual properties of the wood.