ᐅ Interior Window Sills – What Depth or Overhang Is Recommended?

Created on: 25 Jan 2018 19:15
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winnetou78
Hello,

I was working away from home this week and stopped by the construction site briefly this evening.
I couldn’t believe my eyes.
The main contractor installed the interior window sills, but they protrude by at least 10 cm (4 inches), and probably around 8.5 cm (3.3 inches) after plastering.
Isn’t that unusual nowadays?
That was common practice in the past when you needed to hide radiators underneath.
Now all the issues begin, but surely it can’t stay like this, right?

Best regards,
Daniel
White window frame with wide window sill in front of raw concrete block wall; construction work visible.

Interior construction site: raw concrete wall, window sill, pipe penetration, pink markings on the wall

Coffee cup on provisional window sill; exposed cable duct in wall.
Y
ypg
26 Jan 2018 13:39
Mycraft schrieb:
Well, with narrow bricks there simply isn’t enough space to install the “standard” window sills that are 20cm (8 inches) deep. Then it looks like it does in your case.

But it seems to be due to something else if you have 36.5cm (14 inches), as you say. Anyway, have it corrected and move on. A good general contractor (GC) should be willing to discuss this.

No, our interior is also narrow, yet we still have a decent window sill with about a 2cm (0.8 inch) overhang. Unfortunately, it’s relatively narrow.
Mycraft26 Jan 2018 13:46
@ypg

Yes, it is then narrower than 20cm (8 inches). As far as I know, the standard windowsills are exactly those 20cm (8 inches) ones. In other words, they are installed by the wagon load.

But anyway...
Y
ypg
26 Jan 2018 13:55
Mycraft schrieb:
@ypg

Yes, it is narrower than 20cm (8 inches). As far as I know, exactly 20cm (8 inches) window sills are the typical standard ones. In other words, they are installed by the wagonload.

But anyway...

Take a look at the picture posted by winnetou on page 1: the spacing (see wall thickness) is now standard, and the material is available in that depth!
Mycraft26 Jan 2018 14:07
Yes, of course, it is available for purchase. However, that does not change the fact that 20cm (8 inches) is more commonly used and installed on both sides, as is the case here. It actually looks suspiciously like 20cm (8 inches).

But as already mentioned, it doesn’t really matter.
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winnetou78
26 Jan 2018 14:34
At our place, they are currently about 15–16 cm (6–6.3 inches) deep, with a 2 cm (0.8 inch) overhang.
RobsonMKK26 Jan 2018 16:26
I think your windows are set quite deep inside. Do you have a photo of the exterior?
In our house, the windows are more towards the outside, with about 3-4 cm (1¼-1½ inches) of the wall visible.