Concrete canopy on existing building

  • Erstellt am 2019-09-27 18:57:38

abc12345

2019-09-27 18:57:38
  • #1
Hello everyone,

after searching for a suitable canopy for our entrance area, I keep coming across canopies made of concrete. In a new building, something like that can of course be integrated without much effort, but we are not building new, rather we have an existing building. Now the question for me is whether it is still possible to implement it afterwards here.

To clarify exactly what I have in mind, I have included an example picture for you.

Regarding the dimensions: The entrance area is 1.40 m wide. Ideally, the canopy should also be this wide. In length, I was thinking about 1.5 - 2.0 meters.

I am not a professional and not a craftsman but I am handy and skilled, i.e. I do not necessarily need a specialist company but just help on how I can implement it so that it also holds and does not collapse in severe weather or under snow load.
I come from Saarland, i.e. snow is not abundant and also not really often in our "winter".

I had imagined now that I would make the vertical support out of concrete formwork blocks with reinforced steel so that I can create a connection to the base. The base is an extension floor in the basement, i.e. a concrete basement ceiling. The concrete formwork blocks can be plastered later accordingly and through a coating/spatula technique I am sure you can get a concrete look? (Alternatives are of course welcome). I had thought about whether I could perhaps build a shuttering myself in this dimension but I am not sure whether it would withstand the pressure from the concrete. Here too I would appreciate ideas/instructions on how it could be implemented.
So that the "lid" of the whole construction holds and gets a stable bond with the house, I thought that I could perhaps insert slots every 50 cm along the length of the roof in the wall and insert steel beams into the wall there so that the weight is absorbed. Then stiffen everything with steel, put shuttering underneath and support it accordingly and then pour the lid out of concrete. The sealing on the wall with appropriate sealant and a slope for water drainage.

So my plan

Now I hope for your input and ideas whether it is feasible and how I can best implement it.
It would also be helpful to know how thick the ceiling must/may/should be, which beams have to/should be inserted so that it holds. I do not have a structural engineer on hand who could calculate something for me beforehand.

Thanks in advance for your help.

Best regards
 

Golfi90

2019-09-27 22:16:48
  • #2
Interesting topic. We completely neglected the porch roof in our planning, and if there is an acceptable option here, I would not be opposed to it either.
 

hampshire

2019-09-27 22:33:31
  • #3
In addition to snow load, wind load also plays a role in a construction as shown. This can of course be done with suitably strong anchors in the wall. I would involve a person with knowledge of structural engineering on site to discuss the dimensioning and construction. Especially if it is to be an elegant and delicate construction, one must see, think, and calculate on site. Does it have to be solid or is the concrete look or surface enough for you?
 

abc12345

2019-09-28 09:25:28
  • #4
I have attached two older photos so that one can better imagine the conditions. The house, although it has now been newly plastered and painted on the outside (except for the base), this does not detract from the construction project. The base itself is to be newly plastered and painted next spring. Inside the house at this location is the stairwell, which is still a shell, meaning structural modifications could also be made here for breakthroughs through the wall for anchors or otherwise. Generally, the question remains whether it is possible to properly create something like this and if so, with which material. And for your information... the "nice" railing will of course also be removed.
 

abc12345

2019-10-11 11:11:03
  • #5
So, I have now tried out different variants and also spoke with a structural engineer. Doing the whole thing out of concrete would be possible but the cost/benefit ratio is not justified. Now the basic framework will be made of wood and then later clad and plastered accordingly so that it has the concrete look.

The roof will be placed on later and anchored to the wall accordingly, that is all already clarified and calculated. However, I do not want to make the vertical support out of wood but rather build it with masonry. For this, I would use 17.5 cm formwork blocks, equip them with reinforcement and fill them with concrete. To achieve a connection to the base (in this case a concrete wall), my idea was to go there and simply drill holes from above, embed the vertical connecting reinforcement in concrete there, and then place the blocks on top so that they have a connection to the base and do not tip over.

Now my question is whether this is also feasible in practice or whether it will have no stability if I only connect 4 vertical 10mm reinforcement bars to the base? Can I also simply place this on the existing base (of course I would remove the tiles, they will be removed anyway) or must there still be an intermediate layer of bitumen or something else between the base and the first block?

Or do I need to approach the whole thing differently to achieve stability?

In the attachment, marked in red, how the wall will be erected. Freestanding without a connection to the house wall. The lid will later be connected to the side part and rests on top.
 

Alex124

2019-10-11 12:35:45
  • #6
Why are you so set on concrete? Have you ever considered steel? Just as an idea, the roof as drawn there is much too small in practice. Even the slightest wind makes it wet everywhere underneath. How about a steel structure over the entire tiled area? Glass on top, and it would also be nice and bright, and could be combined with the railing so that it looks coherent. The side can be closed with glass or steel (powder-coated or stainless steel). These concrete angles, like those seen on some new houses, in my opinion only fit if it’s a square cube with a flat roof. Just a few thoughts, but in the end, you have to like it.
 

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