Should the gap transition from the roof box to the masonry be closed or not?

  • Erstellt am 2019-08-23 08:03:28

Patkia

2019-08-23 08:03:28
  • #1
Good morning,

I hope I am in the right subforum here.

We have a townhouse with a hipped roof (cold roof).
The cladding of the roof overhang has an (irregular) gap of about 0.5-1.5 cm to the masonry.
We are building without ETICS.

I have the following questions regarding this:

When the masonry is plastered, how does the gap behave? Is it somehow closed by the plasterer beforehand and then plastered over? Or does it automatically result with the gap being more or less plastered over? Or does it remain open for building physics reasons?

Perhaps it is also important to mention the reason for my question. I would like to have lighting around the house. It should only indirectly illuminate the corner between the fascia board and the exterior wall. Now there are different ways to implement this. For example:
- 1. Later drill a strip onto the plaster, let the lighting shine upwards from it. Of course, this strip is then quite conspicuous.
- 2. Seal the masonry 2-3 cm below the fascia board with, for example, tile adhesive, attach the strip to it, and only plaster against it from below. Thus, the strip carrying the lighting would be quite discreetly hidden in the plaster because it just rests on top (and can possibly be painted). However, here the problem with the gap between the masonry and the fascia board comes up again...

Therefore, I would now like to know whether this gap can/must/may be closed... and how the plasterer would possibly handle it if he is plastering normally.

Unfortunately, I cannot ask him myself at the moment, but I have to proceed with the planning because time is pressing.

Thank you very much in advance for your help.
I have attached sketches so that you roughly know what I mean. The red lines are the gap in question.

 

hampshire

2019-08-23 08:08:05
  • #2
Fill the gap with [Kompriband] and save yourself a strip.
 

Patkia

2019-08-23 08:15:03
  • #3
The lighting runs along the U-rail, so leaving it out is bad.
 

hampshire

2019-08-23 08:38:19
  • #4
Running the lighting in an upward-open track makes me think of moisture problems. When choosing between A or B, I would prefer A.
 

Patkia

2019-08-23 08:55:06
  • #5
Of course, I have waterproof lighting that can withstand moisture. Proper wetness shouldn’t really get in there about 2cm below the eaves anyway.

Why exactly would you prefer option A? The advantage I see with variant 2 is that the U-channel is not quite so obvious, and that it rests on the plaster, so it’s basically secured at the same time.

And ultimately, the most important question for me is whether this gap needs to be sealed or can remain open at all.
 

Patkia

2019-08-28 10:13:54
  • #6
Are there any other opinions here?

The actual question is:

Does the gap between the roof box and the masonry have to be closed? Or should this gap not be closed at all because it has a building physics function?
 

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