Energy saving through better stones

2020-02-01 10:32:56

I am pro insulation but I like to play the Advocatus Diaboli.

Disadvantage: If the external cubature is taken as given, the living space decreases by 1 m2 for every 2.5 cm thicker stone. Per floor, of course.

That means 2 m2 less for 2 floors or, in a flat calculation, 2400 euros more in construction costs... with 5 cm thicker stone, twice as much, and so on.

2020-02-01 11:18:25

Some arguments have already been mentioned as to why it could still be worthwhile.
- KFW !!!!
- Resale value
- Smaller heat pump
- Possibly less underfloor piping
- etc.

I'll add another point.
Your financial loss calculated over 40 years is €1230. That’s laughable! For me, just my ecological conscience alone would be worth bearing these additional costs.

And finally, I can tell you that your calculation is probably incorrect. I would assume an annual electricity price increase of 1 - 1.5%. Then the matter looks even better.

So from my point of view, a clear recommendation in this case: The stone with the lower U-value pays off!

Regards
Specki

The heating load savings are just 372 watts. For 150 m² that is 2.5 W/m²
0.17 1056 W
0.23 1428 W
You don’t save anything on the underfloor heating or the heat generator.

Rising energy costs are irrelevant if you finance and have to pay 1% interest on the additional costs.

I am pro insulation, but I like to play the devil’s advocate.

Disadvantage: If you assume the exterior volume as given, the living area decreases by 1 m² per 2.5 cm thicker stone. Per floor, of course.

That means 2 m² less for 2 floors, or in rough calculation 2400 euros more building costs... with 5 cm thicker stone double that, etc.

All U-values are based on 36.5 cm stones. You don’t necessarily have to switch to larger ones.

2020-02-01 11:47:08

We chose the thicker stone purely for aesthetic reasons ... and we like thick reveals .... and also when I saw what was sometimes cut out of the 42.5 for pipes etc., I was quite glad to have chosen it

Energy saving through better stones

Scout

hegi___

Snowy36