The Strength Of Filler Joist Floors

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. 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. 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.

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The strength of filler joist floors.

How to make floor joists stronger. True floor joist span calculations can only be made by a structural engineer or contractor. Coke breeze and filler joist construction masonry and steel this information is only available to paying isurv subscribers. Those of earlier date from the 19th century can have wrought iron sections or even cast iron tees in early floors.

These may commonly have embedded iron or steel joists. Many structural engineers have for a long time been convinced that the effect of casing steel beams in concrete in the manner which has obtained for many years with the filler joist floor has a strengthening effect upon the floor and that it is safe to design the steelwork in such floors upon higher stresses than the extreme fibre stress of 7 5 tons per square inch which is usually specified. Long spans of joists in newer homes may wobble or bounce from foot traffic. After several centuries of service floor joists in older homes may sag or crack.

The strength of filler joist floors.

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