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Old 04-11-2012, 12:26 AM   #1
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How to replace exterior door on cement sill?


I want to replace an exterior door that is on a cement sill.

I am only replacing the door, not the side window as shown in the window.
The next image shows the cement sill carrying into the house.

The replacement door is pre-hung and must be installed with its own frame in order to qualify for government rebate programs. This image shows the sill of the replacment door.
If I put the replacement directly on to the cement sill, the sill will be very high and it looks like I might not have the clearance in the rough opening to insert the new door's frame.

How should the replacement door be installed? Should the cement sill be removed or cut down? Or can I install the replacement door on top of the sill?

Any help would be greatly appreciated.

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Old 04-11-2012, 05:26 AM   #2
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How to replace exterior door on cement sill?


The new door (pic #3) has a built in threshold.
* What is the total Height and Width of the new door assembly?

* What will be the H & W of the opening when you remove the present door and Jamb?

* Are you going to have to modify the existing side light window to accommodate the width of the new door assembly?

In pic #1 there is a high step up to the present sill. How High?
It would be most desirable IMO if that exterior transition could be brought up to the sill height.

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Old 04-11-2012, 06:33 AM   #3
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How to replace exterior door on cement sill?


Standard height(80") prehung doors are usually about 82 1/2 " high, without the brickmold. If you don't have that much, you either enlarge the top of the opening, or get a cutdown door. Don't do anything to the concrete sill unless absolutely necessary.

Personally, I would also replace the sidelight.
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Old 04-11-2012, 07:07 AM   #4
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How to replace exterior door on cement sill?


Quote:
Originally Posted by Just Bill View Post
Standard height(80") prehung doors are usually about 82 1/2 " high, without the brickmold. If you don't have that much, you either enlarge the top of the opening, or get a cutdown door. Don't do anything to the concrete sill unless absolutely necessary.

Personally, I would also replace the sidelight.
+1

You are not going to cut that concrete and 99% of the adjustments would be done at the header.

I would also consider full replacement to include that sidelite for a nice look.
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Old 04-11-2012, 09:21 AM   #5
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How to replace exterior door on cement sill?


+1 to the above comments. You are in for a bunch of extra work if the height won't fit. The $75-$100 for the proper height would have been a wise investment, as would the new sidelight.
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Old 04-11-2012, 08:50 PM   #6
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How to replace exterior door on cement sill?


First, absolutely agree about replacing the sidelight, but the problem is I'm trying to do this for as little as possible.

I had read a couple of posts that talked of grinding or chiselling the sill down, but I'm happy to hear that you don't recommend it.

I won't know the size of the rough opening until I remove some trim, but I suspect it'll be tight (and only tight if I'm lucky). I am imagining I might have to open up the wall to move the header up.

I have to confirm, but I think the existing sill slopes out, so putting the new door in will leave a gap between the edge of the new sill and the old cement sill. Any suggestions on how to fill the gap - or should I try to grind down just that part of the cement sill that the new door would rest on so that the new door has a level surface to rest on.

I'm looking forward to hearing your suggestions.
Thanks
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Old 04-12-2012, 01:09 AM   #7
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How to replace exterior door on cement sill?


CKS, Go ahead and remove that trim over the door now. I think you will definitely have a height problem because the new door has an integral threshold. You're likely to have a width problem too because you have a full dimension door. Your present door, like most, has probably been cut down slightly to make it fit.
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Old 04-12-2012, 07:53 PM   #8
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How to replace exterior door on cement sill?


I took a closer look. The sill seems fairly even, so I don't think I will need to worry about the door sitting unevenly.

I will definitely take the trim off to see what the rough opening looks like for measurements. This seems like a project worth documenting. Hopefully someone will be able to learn from it.

Thanks for your insights. They are appreciated.
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Old 04-12-2012, 10:37 PM   #9
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How to replace exterior door on cement sill?


What to be learned: measure twice, buy once.... just sayin'.
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Old 04-13-2012, 10:08 PM   #10
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How to replace exterior door on cement sill?


I would leave that sidelite alone. It looks great. Maybe put a few more stickers on it. It's always popular to put a "protected by Smith & Wesson" sticker there.

You didn't send any pictures of the head of the door. Don't move the header, just cut some off.

Lord help you if you have a steel lintel up there and masonry over the top.

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