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Some days ago I have posted a Picture of an eccentric isolated foundation and I asked my fans on facebook that whether it is right to place an isolated column foundation like this or not?

As a result I have got some very useful and insightful comments of my fans which i though I must share with you on the subject of eccentric footing, cantilever footing or shoe footing.


After seeing this picture one thing is obvious that it is isolated foundation, but we mostly have columns at the center in the isolated foundation but due to property restriction and for keeping the rules of property line in the region such foundation is constructed but with proper provisions and following the code i.e. satisfying all the forces including shear and overturning moments. Which is not the case as such as far as my judgment is concerned. 

If you say this is completely wrong than actually this is not the case, as mostly in our cities where the area is restricted and the last column in the edges or in the corners they need to be placed on such foundations so that the columns can be hidden in the outer exterior walls without wasting the space. 

Picture from Ricardo Castro
Picture from Ricardo Castro
So keeping in view of this requirement one of our fan Ricardo Castro was of view that this is not completely wrong as sometimes you need to follow the property lines. 

However, there are some mistake in this as well; and we would like to quote some of the answers we get from our fans :- 

JD Orendain 


No strap beam? Thats just not right. The footing cant handle the moment due to eccentricity of the column. Property footings require strap beam so as to handle the moment and for the footing to act as a double cantilever footing.


Aquil Sohail 


It is right..This type of footing is called shoe footing....For this type of footing required more depth and heavy steel..I was cast like this type of footing on site .. Mostly use when space is very less ..

Engr Anwar Khan 


Its eccentric footing use mostly to the property line.if it a multi story builing need to connect with other footing such is strap beam/combine footing to avoid tilting of the footing. 

Mukassar Najeeb 


If load is less than no problem but provide a strap beam in footing equal to length of footing only no need to connect with another footing 

Mohamed Abd


 if it is a single.storied.building no.issue.but for a multisrotied building better to plant a column at the.eddge of.the.footing untill meet a strap.bram at the tie.beam.level 

Kunal Kutwaroo 


No blinding layer. No cover. No strap beam. Wrong

Important Points to Remember for Eccentric Footing, Cantilever Footing or Shoe Footing

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Saad Iqbal

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Iamcivilengineer

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