STYLE DESIGNATION

PANELS / SHEETS

Current Designation (by W - Number)	Previous Designation (By Steel Wire Gauge)	Weight Approximate lb per 100 sq. ft.
6 x 6 - W1.4 x W 1.4	6 x 6 - 10 x 10	21
6 x 6 - W2.1 x W 2.1	6 x 6 - 8 x 8	29
6 x 6 - W2.9 x W 2.9	6 x 6 - 6 x 6	42
6 x 6 - W4.0 x W 4.0	6 x 6 - 4 x 4	58
4 x 4 - W1.4 x W 1.4	4 x 4 - 10 x 10	31
4 x 4 - W2.1 x W 2.1	4 x 4 - 8 x 8	43
4 x 4 - W2.9 x W 2.9	4 x 4 - 6 x 6	62
4 x 4 - W4.0 x W 4.0	4 x 4 - 4 x 4	86

ROLLS

Current Designation (by W - Number)	Previous Designation (By Steel Wire Gauge)	Weight Approximate lb per 100 sq. ft.
6 x 6 - W1.4 x W1.4	6 x 6 - 10 x 10 21
6 x 6 - W2.9 x W2.9	6 x 6 - 6 x 6 42
6 x 6 - W4.0 x W4.0	6 x 6 - 4 x 4 58
6 x 6 - W5.5 x W5.5	6 x 6 - 2 x 2 80
4 x 4 - W4.0 x W4.0	4 x 4 - 4 x 4 86

Light fabric can be supplied in either rolls or flat sheets. Fabric made of wire heavier than W4 should always be furnished in flat sheets. Where WWF must be uniformly flat when placed, fabric furnished in rolls should not be fabricated of wire heavier than W 2.9. Fabricators furnish rolled fabric in complete rolls only. Stock rolls will contain between 700 to 1,500 square feet of fabric determined by the fabric and the producing location. The unit weight of WWF is designated in pounds per one hundred square feet of fabric (table 7-4). Five feet, six feet, seven feet, and seven feet six inches are the standard widths available for rolls, while the standard panel widths and lengths are seven feet by twenty feet and seven feet six inches by twenty feet.

Sheet-Metal Reinforcemat

Sheet-metal reinforcement is used mainly in floor slabs and in stair and roof construction. It consists of annealed sheet steel bent into grooves or corrugations about one-sixteenth inch (1.59 mm) in depth with holes punched at regular intends.

Tension in Steel

Steel bars are strong in tension. Structural grade is capable of safely carrying up to 18,000 psi and intermediate, hard, and rail steel, 20,000 psi. This is the SAFE or WORKING STRESS; the BREAKING STRESS is about triple this.

When a mild steel bar is pulled in a testing machine, it stretches a very small amount with each increment of load. In the lighter loadings, this stretch is directly proportional to the amount of load (fig. 7-4, view A). The amount is too small to be visible and can be measured only with sensitive gauges.

At some pull (known as the YIELD POINT), such as 33,000 psi for mild steel, the bar begins to neck down (fig. 7-4, view B) and continues to stretch perceptibly with no additional load.