ᐅ Insulation of the Basement Slab Using Thermo-Brick

009_frank schrieb:

To what extent is it negligible? Do you mean that thermal bridges cannot occur if everything is done correctly?

11ant schrieb:

No, with insulation above the slab all walls have thermal bridges downward – but not to the extent that it would be visibly noticeable on the heating bill.

Someone was quicker with the answer.

So thermal bridges do exist, but not strongly enough to cause mold?

009_frank schrieb:

So thermal bridges do occur, but not strongly enough to cause mold?

Of course not. Otherwise, every other new building would have mold problems. Insulating the slab on ground is a completely common practice.

nordanney schrieb:

Of course not. Otherwise, every second new build would have mold issues. Insulation on the concrete slab is a very common solution.

I see. I thought insulation under the concrete slab had long been standard practice. I was also concerned because it is a heated basement, not just a utility basement.

009_frank schrieb:

I thought insulation under the slab was already standard practice.

Just as standard as insulation on top of the slab. It’s like saying today that electric cars are standard. Or gasoline cars. Or diesel.

009_frank schrieb:

So thermal bridges do exist, but not strong enough to cause mold?

The exterior walls are insulated on the sides against the soil, and even for them, with their (compared to the interior walls) larger contact area, the lateral clearance is greater. The interior walls, with their smaller contact area, are hardly relevant here.

009_frank schrieb:

I thought insulation under the slab had long been standard. I was also concerned because it is a living basement and not just a utility cellar.

An increased scope of work enhances value creation. A separately contracted slab installer (only someone who ignores my posts will hire one) will be more than happy to sell you the insulation underneath. When integrated into the overall (shell) construction contract, “it stays in the family” whether the insulation goes below or on the slab; or in the case of individual trade contracts, it usually ends up in the screeding contractor’s scope (never with the groundwork contractor). From your perspective, it might not make a difference, but your money goes out either way. Yet each contractor wants that money specifically in their own pocket and is not looking out for their colleagues. So “standard” really means “get your money into my pocket, not the others’.” That’s why I strongly advise against consulting contractors when deciding on the best measures for renovation or building work: because everyone is focused on their share of the pie, and no contractor cares if the client has to bake more pies to feed the others. I explained this once in the now mysteriously lost post #28 of the thread https://www.hausbau-forum.de/threads/renovierung-eines-altbaus-grundriss-einteilung-erfahrungen.48295/page-5:

... the absolute never-ever mistake is to ask executing companies. Because they only think of themselves and don’t care if you end up with unfinished tasks after the money runs out. Get five quotes, and one will use 50% of your budget, another 40%, the other three will be more reasonable and say only 20% each but will tell you to do only the absolute minimum. One will say it has to be half again as much, and two others say double the amount. So you add up: 50 + 40 + 30 + 40 + 40 = a total of 200 percent of your budget, and you can only come to two conclusions: first, that you do not have or want to spend that much; second, that demolish-and-new-build would be cheaper. And those 200% are just rough estimates, the detailed quotes will be even higher, 230 percent, oh and they didn’t even include VAT, so 273.7 percent, and prices keep rising until execution—under 280% it won’t work.

By the way, a living basement is nowadays considered “standard” to be included in a controlled mechanical ventilation system – which also counteracts mold risk.

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