What is an LH joist?
LH-Series. LH-Series Joists are for longer span conditions and are capable of supporting larger loads. These joists allow for special profiles to accommodate a variety of conditions. Some of the typical special profiles include gable joists and arched joists.
How far can a bar joist span?
These joists easily handle spans that wood systems cannot handle while their lightweight construction makes them much less costly than steel beams. K Series joists range in depth from 10” to 30” and can span up to 60′.
How are open web steel joists made?
Modern-day open web steel joists are similar to those produced in the 1920s and 1930s, and all feature top and bottom chords, with diagonal, and sometimes vertical, web members between the chords. Today’s steel joists are often fabricated using double angle chords and webs made from angles or round rods.
Can you use 2×6 for roof rafters?
2×6 shed roof rafters are enough for nearly any type of shed a homeowner wants to build. While a 2×6 might be nearly double the cost of a 2×4, you can likely space the 2x6s further apart, negating the added expense of increasing your lumber width.
What is a Steel Joist Institute specifications and load table?
These tables originally appeared in the Steel Joist Institute Specifications and Load Tables, commonly referred to as a catalog, beginning with the first edition published in 1932. Each load table was accompanied by notes and instructions covering assumptions and other important information.
Is the manufacturer of a joist known to the engineer?
In fact, in situations where the manufacturer of a particular joist is known, unless the same producer has enough information archived on the particular project members, the manufacturer’s engineer can only assume that their minimum standard weld was provided.
What is the allowable shear for an H-series joist?
The allowable shear for an H-Series joist starts at the Maximum End Reaction value (given in the table) and decreases by the allowable uniform load value given just above the blue transition line until it reaches a minimum value of 1/2 of the maximum end reaction.
What is the difference between K and LH floor joists?
The K-Series joists are standardized in depths from 10 inches (254 mm) through 30 inches (762 mm), for spans up through 60 feet (18288 mm). The LH-Series joists are standardized in depths from 18 inches (457 mm) through 48 inches (1219 mm), for spans up through 96 feet (29261 mm).