ᐅ Variants of Basement Construction (Pouring Concrete Walls in the Middle?)
Created on: 7 Mar 2020 15:48
A
annab377
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.
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.
Vicky Pedia schrieb:
Insulation has nothing to do with waterproofing membranes. First, you would need to check the soil report to see if there is any groundwater pressure, as that definitely affects the construction method. Waterproofing has recently been updated in the DIN 18533 standard. Right now we are dealing with too many variables.
Oh, and of course, there is still the traditional masonry basement. According to a well-known architect, masonry basements are no longer common in our region (Baden-Württemberg) because prefabricated wall panels are faster and also usually more cost-effective.
Thanks for the answers.
@rick2018 what do these sealing strips look like, or how are the individual prefabricated wall panels waterproofed when cast? Do you know the approximate thread number for your discussion on this?
Unfortunately, I can’t give you the page number. You’ll have to flip through until you reach the shell construction section. The wooden walls are sealed before filling. Those in contact with the ground, like basements, are sealed additionally after filling.
We wanted the concrete look. It’s true that basements are rarely built with masonry. It’s usually either precast concrete panels or traditional formwork.
There are also precast panels with integrated insulation, called thermal panels. We originally planned to use these, but due to our special window system, it wasn’t possible.
Do what the construction company usually uses. Overall, it’s better and more cost-effective with the experience they already have.
In my area, I see both newly built basements with formwork and with precast panels. However, precast panels are more common.
I don’t know where exactly in Baden-Württemberg you are from, but, for example, there is a manufacturer in Geisingen (near Lake Constance).
We wanted the concrete look. It’s true that basements are rarely built with masonry. It’s usually either precast concrete panels or traditional formwork.
There are also precast panels with integrated insulation, called thermal panels. We originally planned to use these, but due to our special window system, it wasn’t possible.
Do what the construction company usually uses. Overall, it’s better and more cost-effective with the experience they already have.
In my area, I see both newly built basements with formwork and with precast panels. However, precast panels are more common.
I don’t know where exactly in Baden-Württemberg you are from, but, for example, there is a manufacturer in Geisingen (near Lake Constance).
annab377 schrieb:
2) The precast basement (precast basement walls are delivered and lifted into place 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 cures), where the interior cavities are then filled with concrete. I haven’t seen option “2” in any other variants for a long time, usually it corresponds to “3.” With ready-mix concrete pouring, it’s much more practical: the wall panel is significantly lighter while it still needs to be transported and positioned, and in this method, the wall effectively includes its own “lost” formwork. Additionally, there are formwork blocks, where a lost formwork is built “stone by stone”; this is the most suitable method for DIY builders. 11ant schrieb:
Where is the house described in relation to the basement question? https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
It may be true that 3) (prefabricated walls, cavity walls) have become the standard. A friend also mentioned that most construction companies currently use this method almost exclusively.
Since 2) (solid walls) are still offered, I just included it here as well.
I have not posted the house here.
Since 2) (solid walls) are still offered, I just included it here as well.
I have not posted the house here.
...just as a side note from personal experience... I would be surprised if cavity walls were actually cheaper than cast-in-place concrete. Personal experience, because I have considered both myself and also seen it multiple times in the neighborhood with different construction companies. On the contrary, prefabricated elements are a significantly higher cost.
Edit: Same applies in Baden-Württemberg
Edit: Same applies in Baden-Württemberg
Have you also taken into account that with a shuttered basement, the interior walls cannot simply be painted right away (plastering and additional work are required) and that the window openings have to be cut out afterward (more labor)?
Do you have any specific figures? Unfortunately, I don’t, just experience from several construction companies who nowadays mostly use prefabricated walls. Or what could be the advantage of prefabricated walls compared to the shuttered method, which (increasingly) many rely on?
Do you have any specific figures? Unfortunately, I don’t, just experience from several construction companies who nowadays mostly use prefabricated walls. Or what could be the advantage of prefabricated walls compared to the shuttered method, which (increasingly) many rely on?
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