This is article 3 of 6 in chapter 5.
Floor joist types 1960 s.
Two types of engineered joists are most frequently used in floor systems today.
Wood i joists with dimension lumber top and bottom chords and osb web.
I know it s not what you re looking for but here s the info anyway.
Ceiling joists supported the ceiling and acted as a tie to the rafters to stop the rafter feet from spreading.
This sample table gives minimum floor joist sizes for joists spaced at 16 inches and 24 inches on center o c for 2 grade lumber with 10 pounds per square foot of dead load and 40 pounds of live load which is typical of normal residential construction.
Himat bethlehem steel torsion analysis of rolled steel sections 1963 81 pages 17 mb pdf us steel technical report on steel framed parking structures 1971 57 pages 5 2 mb pdf.
Considering the cross section of a typical joist the overall depth of the joist is critical in establishing a safe and stable floor or ceiling system.
1 397 000 in lbs end reac.
This is from the 60 year joist manual.
1962 1970 1974 1983 1989 1994 2002 2005 2010.
Open web trusses with wood webbing held together with metal plates.
Assorted 1940 s macomber steel joist information contributed by.
In many countries the fabrication and installation of all framing members including joists must meet building code standards.
1970 1974 1983 1989 1994 2002 2005 2010.
Often it is necessary to find out the type and thickness of your floor s layers.
The deepest and heaviest joist listed is the 30h11.
True floor joist span calculations can only be made by a structural engineer or contractor.
A binder running at right angles to the ceiling joists could be added to help prevent deflection in the joists.
In some houses the binder was connected to the ridge by a hanger again to prevent deflection.
Heavy objects such as cast iron tubs refrigerators and clothes washers need strong flooring.
1985 1987 1994 2002 2005 2010.
1961 1971 1972 1974.
The partitions ceilings walls stairs guide of old house web restoration guide this guide was developed and edited for old homes from original materials in the u s.
The deepest h series joist i can find is from the 1972 and 1974 tables which added 26 to 30 inclusive still no 36h joists.
Strucdesigneit macomber steel joists 1940s 48 pages 2 3 mb pdf assorted structural steel information contributed by.
For 30h11 56 span moment.
I joists have major advantages in high volume construction with standard layouts.
For example base flooring layers need to be firm flat and deflection free for ceramic tile or natural stone.
Joists must exhibit the strength to support the anticipated load over a long period of time.
