DPC under front door sill

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Hi there,

I'm just fitting a hardwood door sill in place of a ceramic tiled step just beneth my front door. I have removed the tiles and cut into the concrete floor about 20mm in order to get the sill underneith the door jambs. Do I need to place a piece of DPC between the concrete and door sill?

Thanks!!
 
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Hi there,

I'm just fitting a hardwood door sill in place of a ceramic tiled step just beneth my front door. I have removed the tiles and cut into the concrete floor about 20mm in order to get the sill underneith the door jambs. Do I need to place a piece of DPC between the concrete and door sill?

Thanks!!

well it wouldn't hurt. rising damp is always a possibility.
personally i would sit the sill on plastic packers and leave an air gap. seal it on the inside face with expanding foam. i am always paranoid about water traps. it depends on the exposure though.
 
You should definitely replace the damp membrane under the cill & bring it up over the ends if you’ve gone below the original DPC. Leaving an air gap under the cill is pointless unless you have air circulation; all it will do is provide a moisture trap for all sorts of crud & a home for loads of bugs.
 
i would leave the air gap open to the outside (sealed on the inside). thus drained and ventilated.
the ground level outside should be lower of course and falling away from the building.
 
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i would leave the air gap open to the outside (sealed on the inside). thus drained and ventilated.
the ground level outside should be lower of course and falling away from the building.
I wouldn't; no air circulation = no ventilation; no ventilation = a nice damp void & if the void is small enough, it will even suck water into it!
 
no, a gap bigger than 5mm will ventilate better than than the zero to 1mm gap left by someone "sealing" it. any water penetrating the door/ frame (ie when the side seals fail etc;) can escape.

i mean it's not worth arguing about, it's just the way i look at it. i've pulled out window and door frames where the sill has been 50% wood and 50% water. others like to "seal" everything in sight but they (the seals) do fail in the end.
 

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