drilling through under door

[i=p/u]

is their a chance of damp getting in if you drill under door below ground level.... it will be filled in with compacted sand and paved afterwards

i plan to drill 20mm hole to pipe out along to put lights on wall outside????

i cant see a proble as the sand will be compacted can you see a problem or have you had trouble with this

 

[malcolmsanford]

If you drill below the damp course then you are in deep pooh .................. so under a door providing it's above the damp course your fine.

 

[ian.settle1]

If you drill below the damp course then you are in deep pooh .................. so under a door providing it's above the damp course your fine.

Making sure you don't damage the DPC when doing so

 

[Robotstar5]

Drill at a slight angle with the "fall" towards the outside, particularly if bridging the gap in a cavity wall.

 

[Maestro]

wouldn't think it would be problem the gas comes through under the floor be fine

 

[Knobhead]

You would have to create a hydroscopic path around the DPC to cause problems.

Your cable through the foundations isn’t any different to the water, gas and supply cable.