ᐅ Variants of Basement Construction (Pouring Concrete Walls in the Middle?)

Hello everyone,

I’m curious about your experiences with the different types of basement construction:

I’ll list what I know and what, as far as I’m aware, are the most common methods:

1) Formwork basement walls (where metal panels are used to build the formwork and then concrete, for example waterproof concrete, is poured and cured in place)

2) Precast basement (precast basement walls are delivered and lifted into position by crane)

3) A method recommended to me by an acquaintance: a type of concrete wall formwork (not metal panels that are removed after the concrete sets) whose cavities are subsequently filled with concrete.

Since my acquaintance recommended option 3) (which is supposed to be one of the most cost-effective options), I’m primarily interested in that. What is this type of concrete wall formwork called? Have you had any experience with it?

In general, is it sufficient if you don’t use waterproof concrete, but instead properly coat the exterior walls with bitumen (which I understand is called a “black tank”) and then glue EPS insulation boards onto that? Would that provide a lifetime of protection and keep the basement adequately watertight?

What is better for exterior insulation: EPS or XPS boards?

Thank you very much for your insights and suggestions.
Ann.

Precast concrete panel walls consist of two prefabricated concrete panels connected by steel mesh beams. For this reason, they are often referred to as double walls or cavity walls. On-site, the cavity is filled with cast-in-place concrete, resulting in a monolithic reinforced concrete wall.

The version from item 3) is probably called an element wall in construction jargon. How are the edges and joints of such an element wall effectively protected against moisture? Is a good layer of bitumen, in other words a black tanking membrane, sufficient? That should be enough, right, and you can also attach the perimeter insulation directly to the bitumen. XPS or EPS?

Does no one here really have an opinion on precast concrete walls for basement construction?

Also, is it better to use EPS with drainage stones or only XPS panels for perimeter insulation?

We mostly have this type of concrete wall, including for the garden walls. However, it is made of waterproof concrete with appropriate sealing strips. On top of that, there is bitumen, insulation, and a double studded membrane.

Once the foundation with the vertical reinforcements is in place, the process goes quite quickly. Erect, secure, insert reinforcement, seal, fill, and wait a few days. After that, the props can be removed. In my thread, you can see some examples. The walls are very smooth and can be painted right away with the suitable paint...

annab377 schrieb:

to glue the perimeter insulation.

Insulation has nothing to do with waterproofing. First, you would need to check the soil report to see if there is any hydrostatic pressure, as this affects the method of construction. The waterproofing is now regulated under the updated DIN 18533 standard. At the moment, we are dealing with too many variables.
Oh, and there is of course also the option of a masonry basement.

annab377 schrieb:

Doesn't anyone here have an opinion on precast wall panels for basement construction?

Where is the house described in relation to the basement question?

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