Gap under prehung exterior door threshhold..

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  #1  
Old 03-14-19, 08:16 AM
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Gap under prehung exterior door threshhold..

A buddy an I just replaced an exterior door with a prehung on a concrete slab. They had some bricks and mortar as a sill for the old wood threshold but

A: it was falling apart and
B: it was so high they had to cut the old door to a weird/non-standard height.

So it made sense to demo the brick out as there was a good pitch to the drain in front of it.

Once we did that we used some quick set and build a slight sill but didn't quite get it level so there are now gaps under the door. I am wondering what the best way to fix this would be.

Should I pull the door, lift it a bit, put more quickset down and a level PVC board sill for the threshold to sit on? or are there other methods of filling the gap without pulling the door.

Also, this door will have a doghouse built over the staircase at some point so It will not technically be an outside door for long.

EDIT:
PS
The gap is bigger than appears in the picture. I started shimming the right side under door gap with plastic shims which seems to be filling the space pretty well. Maybe I should keep going and then use some kind of water-resistant sealant??


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Last edited by PJmax; 03-14-19 at 11:49 AM. Reason: resized pictures
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  #2  
Old 03-14-19, 10:17 AM
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I would mix up a small batch of mortar and pack it into the gap.
 
  #3  
Old 03-14-19, 10:37 AM
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Doors need to be set in a bed of sealant in order to keep water out. So IMO there is no good way to do what you want without removing the door. The concrete really should have been level and flat. So I'd suggest you remove the door, put a piece of plywood over the hole, and then add mortar mix on top, making sure it is level and perfectly flat this time.

The mortar should cure for a few days before you caulk it and put the door in.
 
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Old 03-14-19, 10:57 AM
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Thanks guys. You both mention mortar, any disadvantage of using hydraulic cement to level the sill? Its what I used to build the sill...
 
  #5  
Old 03-14-19, 11:06 AM
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That should work fine....................................

Hope it and the ground is 40F or above there.
 
  #6  
Old 03-14-19, 11:28 AM
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Weather is 50f currently. Not sure what the ground temp is but the basement is heated.
 
  #7  
Old 03-14-19, 12:16 PM
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Freezing temps at night ruin green concrete, so if it gets cold at night keep it covered with a blanket or something.
 
  #8  
Old 03-14-19, 12:18 PM
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Good tip! will do. Thanks again
 
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