Basement exterior staircase

Hello,

I am new here in the forum. I have not found any posts on my topic, so I am just creating a new one.

We are facing a small problem:

We have bought a house - built around 2000, basement made of reinforced concrete with EPS insulation.

So much for the basic information.

Now we plan to install a basement door on the side - so we excavated and, as suspected, there is no frost wall under the basement (2.5m in the ground)! Under the floor slab (25cm) there are about 10-20cm of gravel and below that rocky soil.
How do we proceed here so that our plan does not damage the house? A basement entrance door is essential in our case – so there is no alternative.

I would be grateful for a quick help.

Regards

A structural engineer has already confirmed the breakthrough for me. So no problem there. There used to be a window at this spot. My only concern is not to unnecessarily prolong the planning. It will likely also be carried out by a company because we do not dare to approach a floor slab ourselves. However, I do not want to be advised cluelessly. I will not be on site for the next 2 weeks, and if I first wait for an appointment with the structural engineer and then also a construction company or several for comparison, and then still find a free appointment, it will not happen this year anymore.

What exactly do you want to know?
You want to handle the planning yourself?

Regards

No. I want to know if it is sufficient to pour a base slab in front of the house’s base slab with a channel connection in the middle (existing) and the supporting walls sealed around it (cast in) and everything insulated around it (if yes, what thickness of insulation), or if I still need a frost skirt under the base slab, or maybe an additional frost skirt for the house’s base slab. That would be very disadvantageous in our case because we are sitting on rock, which starts about 15 cm below the base slab.

...so you want to do the planning yourself, or have it done remotely by someone from the forum :cool:
That doesn’t work. Why didn’t you ask your structural engineer?

I understand that you don’t need a professional’s planning for every small task you carry out on the house. But an external basement staircase, retrofitted with a connection to the existing slab with insulation and all that jazz, is a very sensitive area that requires some expertise

Regards

The planning should be done by the construction company carrying out the work. Unfortunately, the structural engineer who was already there was not asked, but another deployment will probably cost a lot of money again... If I order a finished exterior staircase, I don't need an architect for that either, do I?