Insulation of the ground slab in the basement with thermal stone

  • Erstellt am 2025-04-28 21:46:23

nordanney

2025-04-29 07:54:38
  • #1


Someone was faster with the answer.
 

009_frank

2025-04-29 11:48:20
  • #2
So thermal bridges indeed, but not strong enough to cause mold?
 

nordanney

2025-04-29 12:13:15
  • #3

Of course not. Otherwise, every second new building would have to develop mold. Insulation on the floor slab is a completely common option.
 

009_frank

2025-04-29 14:06:39
  • #4


Oh, I thought insulation under the floor slab had long been standard. I was also concerned since it is a residential basement and not a utility basement.
 

nordanney

2025-04-29 14:12:12
  • #5
Just as standard as on the slab. It's like saying today that electric cars are standard. Or gasoline cars. Or diesel.
 

11ant

2025-04-29 15:40:34
  • #6

The exterior walls are insulated on the side facing the soil, and even for them, with their (relatively to the interior walls) larger contact area, the lateral clearance is greater. The interior walls, with their smaller contact area, have hardly any relevance here.

An extended scope of work increases value creation. A separately commissioned base slab contractor (someone only commissions them who tunes out my posts) will gladly sell you the insulation underneath. Integrated into the overall (shell) construction contract, "it stays in the family" whether the insulation is laid under or on the base slab, or in the case of individual contract awards, it tends to fall under the screed layer installer’s contract (at least never the civil engineer’s). From your point of view, it might come to the same thing, but the money flows from your pocket either way. However, every contractor wants it specifically to flow into their own pocket and is not guardian of their brother’s. So "standard" means "your money in my pocket, not in one of the other participants’." That is why I so strongly advise against consulting contractors about the most suitable measures when building in existing buildings: because everyone is eyeing their slice of the cake; and whether the client has to bake more cakes for the hunger of the other participants is of no concern to any contractor. I had already calculated this in the wondrously no longer findable post #28 of the thread :

A living basement will be included in a controlled residential ventilation system as today’s "standard" – this also addresses the mold risk.
 

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