Those of earlier date from the 19th century can have wrought iron sections or even cast iron tees in early floors.
The strength of filler joist floors.
True floor joist span calculations can only be made by a structural engineer or contractor.
Developed as a method of constructing fire proof floors in some of the early industrial mills filler joist construction was popular in the second half of the 19th and first quarter of the 20th century.
Long spans of joists in newer homes may wobble or bounce from foot traffic.
How to make floor joists stronger.
The term filler joist is a generic one used for certain types of building floors dating in particular from the late victorian era to world war ii.
These may commonly have embedded iron or steel joists.
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.
After several centuries of service floor joists in older homes may sag or crack.
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