What is joist seat depth?

Joist Seats for Nominally Flat Roofs: For a nominally flat roof (roof with a pitch less than or equal to ¼” per foot), the minimum seat depth required by the Steel Joist Institute (SJI), is 2 ½” for K-series joists and 5” for LH-series joists.

What is a joist girder?

Joist girders are primary framing members. The design is simple span, supporting equally spaced concentrated loads from open web steel joists. Joist girders are designed to allow for the efficient use of steel in longer spans for primary framing members.

What standard are steel joists governed by?

Steel joists shall be erected in accordance with the Occupational Safety and Health Administration (OSHA), U.S. Department of Labor, Code of Federal Regulations 29CFR Part 1926 Safety Standards for Steel Erection, Section 1926.757 Open Web Steel Joists.

How much does a joist girder weight?

59 pounds per linear foot
Entering the weight tables for a Joist Girder span of 50 feet, a number of joist spaces equal to 8, a Joist Girder depth of 40 inch, and a panel point loading of 12 kips (ASD), the approximate self-weight of the Joist Girder is 59 pounds per linear foot.

What is K series joist?

K Series bar joists are designed for use typically with lighter loads and are most common in roof design. K Joists are used typically where shorter span conditions are required. It is the purchasers responsibility to ensure that joists and bridging purchased will be selected, erected and installed properly.

What is the difference between a beam and a joist?

Joists are typically smaller beams that run across an open space, typically arranged in parallel series to support a floor or a ceiling. While both terms are often used interchangeably, beams are the main load-bearing structural element of a roof and joists usually span between two beams.

What is the difference between a joist and a joist girder?

The main differences between joists, beams, and girders are size, design, and functionality. Joists are usually small but numerous and mostly supported by beams. Girders are the largest of the three and provide the primary horizontal support to beams.

How is joist depth calculated?

For example, assume the clear span is 15 feet 6 inches. Round up to 16 and divide this span by 2, giving you 8. Next, add 2 to get the required joist depth. In this example, 8 + 2 = 10, so a 2×12 floor joist will be required (it’s important to use the actual lumber dimensions, not the nominal dimensions).

What is the difference between girder and joist?

How wide is a steel joist?

LH-Series Joists have been standardized in depths from 18 inches (457 mm) through 48 inches (1219 mm), for spans through 96 feet (29,260 mm). DLH-Series Joists have been standardized in depths from 52 inches (1321 mm) through 120 inches (3048 mm), for spans up through 240 feet (73,152 mm).

What size are joists?

Typical Floor Joist Size In Residential Construction Floor joists range from 2×8 to 2×12. It is less common to see joists that are 2×6, even though they are included in joist span tables. Older homes are more likely to use 2×6 for joist framing.

Is girder same as joist?

A joist and a girder are both types of beams. The term “beam” is a general, all-encompassing term that refers to a structural member in a structure that supports a roof or floor above it. A girder is the main load-bearing beam in a structure and is supported by posts. Joist is a structural member supported by beams.