Foundation under doors....

[da3533]

Hello

i understand a 1m or so foundation is needed under a wall... but what about under the door... do i need to dig out a trench for the whole width even there is not much load under the door? see pic.

 

[Diver Fred]

Yes, dig to same depth and width; foundation needs to be continuous.

 

[da3533]

when filing with concrete, do I have to do it all at once … can’t it be in sections? Lot of work to mix it all