Insulate utility cellar or not?

  • Erstellt am 2020-01-06 11:57:21

ludwig88sta

2020-01-07 10:46:11
  • #1
A few weeks ago, I asked myself something similar:
https://www.hausbau-forum.de/threads/selten-tlw-bewohnter-Keller-in-therm-huelle-oder-nicht.33210/

In the end, we will include the basement in the thermal envelope. You are simply more flexible in 10-20 years if you want to create another "living space" in the basement. The insulated basements will then settle at around 18 degrees (+/- 1/2 degree). The underfloor heating should also be installed in the basement, and you can always adjust the heating circuits accordingly.

In addition, I once read here in the house building forum or something similar that, according to the current Energy Saving Ordinance, the basement should always be included in the thermal envelope?



That always depends on the difference between the two adjacent rooms. And since the basement is around 18° and the adjacent hallway on the ground floor is around 20/21°, the delta isn't that large, so I think it doesn’t matter that much.
 

Grobmutant

2020-01-21 18:47:51
  • #2
Hm, do you still remember exactly where you read that? Somehow I still don't understand the reason why this should be better for the Energy Saving Ordinance. We just had a conversation with an energy consultant, who would also rather include the basement in the thermal envelope. But I didn't find the explanation very convincing either. Then I would have to heat a lot more volume and possibly even install underfloor heating in the basement.

Our architect would rather just insulate the basement against the ground floor.

Now I am completely confused about what is best for us.
 

ludwig88sta

2020-01-22 09:28:48
  • #3
The main advantage of including the basement in the thermal envelope is simply that you are more flexible in a few years. It would be easier to convert a room into a living-quality room than if the entire basement is not within the thermal envelope and the floor of the ground floor is insulated from below. In addition, I would connect the basement to the central ventilation system, and if it is significantly colder (because it is outside the thermal envelope), it is energetically rather nonsensical.

*Disadvantage of the basement in the thermal envelope: you don't have a cool storage room...
 

HalloClarissa

2023-02-05 16:55:24
  • #4

Hello Grobmutant,
May I ask two years later which option you chose and why, and… whether it has proven to be the right decision?
 

Marvinius

2023-02-05 19:19:42
  • #5
I’m not really the right person to ask, but we fully insulated our basement and installed underfloor heating. I would definitely do it that way again. Everything else seems rather pointless to me.
 

HalloClarissa

2023-02-05 22:00:07
  • #6
We are building a small age-appropriate house, the basement was not planned at all and is only being included because of the hillside location. It will actually be a purely utility basement – we don't want to spend unnecessary money there.
 

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