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Hello,

I have a washbasin that is in the front side of the building. So to avoid the waste water outlet going through the front of the building, the engineer is suggesting a drill in the column or the roof slab. With other options, there are too many bends and the length of the outlet is big as well. So the question is:

a) which one is better - roof slab or column drill of 2"?
b) will there be a problem if there are many bends and length of the outlet is big?

Thanks a lot in advance.

Dont use Bends, go with first options,
Use Corecutting Machine to put the drill in the Column or roof slab dont use any hammer and nails once this work is done you call Borepacking persons to cover the Hole. They use a separete chemicals to cover the holes this work need to be done very careful.