Is an inhabited basement part of the thermal envelope or not?

  • Erstellt am 2019-12-22 20:32:36

ludwig88sta

2019-12-22 20:32:36
  • #1
Hello everyone,

since I really couldn’t find any thread under the two keywords "Keller hülle" in the title, I’m just quickly creating one myself:

current status: A roughly 170 sqm single-family house, 2-story, with 36 or 42 cm insulated bricks (probably with perlite) is planned. We haven’t yet carried out the heating load calculation according to the energy saving ordinance, but that is supposed to happen in the next few weeks. Nevertheless, currently a ring trench collector brine heat pump is the favorite when it comes to heating and the corresponding planned underfloor heating in all rooms on the ground floor and upper floor. In addition, a central ventilation system with heat recovery for all rooms on the ground floor and upper floor is planned.

Now to the actual matter. Originally, I would have planned the ventilation system with heat recovery also for all basement rooms.

Since two home office spaces, a hobby room, and corresponding kids’ rooms are planned on the ground and upper floors, we cannot do without a basement for a also still desired guest room, heating and co., and “storage rooms” (please no “you don’t need a basement” discussion, only constructive contributions on whether the basement with the only partially used living space “guest room” should stay in or out of the thermal envelope).

Now my question is whether one takes the mostly unoccupied and only relatively rarely occupied basement (actually only on a few days, when the guest room is needed with visitors, but I don’t know exactly how many days/year on average) inside the thermal envelope or not. Actually, my gut feeling initially says no, which would mean the floor slab of the ground floor / ceiling of the basement would be insulated accordingly well.

But then, for ecological reasons, I naturally can no longer implement the ventilation system for the entire house (including the basement). The question is also what kind of heating I install in the guest room for the basement (underfloor heating outside of the envelope is a no-go)? Also, how well do you insulate the basement anyway even if it is outside the thermal envelope (perimeter insulation)?

Of course, in that case I have to insulate the basement entrance door accordingly so that no cold comes up / heat goes down.

Or is it price-wise and ecologically more sensible to include the actually mostly unoccupied basement in the thermal envelope and connect it to the central ventilation system and also lay down the underfloor heating with corresponding circuits? And then insulate the cast waterproof concrete basement outside with perimeter insulation? What do you recommend here?

Greetings
Ludwig
 

-XIII-

2019-12-22 20:55:19
  • #2
If money is a limiting factor, then everything into the thermal envelope, underfloor heating everywhere and controlled residential ventilation. We are also currently building it that way, it is simply a gain in comfort and comfort just costs.
 

WingVII

2019-12-22 21:06:52
  • #3
You keep asking the same questions just phrased differently. That has a spam-like character.
 

Tassimat

2019-12-22 21:31:02
  • #4
Ok, the house is big and the basement is only used as storage. So why convert the basement into living space? Much too expensive.

Here you confirm that the basement is rarely used. Do you really have guests who stay overnight? If yes, how often?

If only 2-3 people come per year, they can either sleep in one of the office or hobby rooms, maybe even in the living room, or you can put an electric storage heater downstairs.
 

rick2018

2019-12-22 22:23:15
  • #5
How do you then thermally separate the basement? Insulation on ceilings and walls and a separate entrance or another door inside. I don't think there is much to save there except on comfort.
 

Pinky0301

2019-12-22 23:27:36
  • #6
We are currently renovating and placing the basement outside the thermal envelope. It will have no heating or ventilation. The basement ceiling will be insulated, as well as the walls of the basement staircase. Fortunately, the staircase above from below does not need to be insulated, but it could happen to you as well. The door to the basement staircase must be tight and insulated.
 

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