Poroton T9 unfilled or Poroton T8 mineral wool?

Do you know the U-value of both stones? Sure, the additional cost of 5000,- takes a few years to amortize itself (purely from heating costs, depending on the heating system and its development/electricity price development).

But the more massive the house, the more days it stays warm in autumn and cool in early summer inside, simply because it is more massive. And it lets less noise from outside in. And there is simply more stone left when water pipes or anything else are installed in the exterior wall (the pipes can then also be better soundproofed, etc.).

But of course, it is a question of whether these relatively small advantages are worth 5k extra to someone.

I have the 42 unfilled and would currently take the filled 36 for acoustic reasons.

I have the unfilled 42 and would take filled 36 today for acoustic reasons.

How close to the street do you live that it makes a difference to you?

Isn't the unfilled one the U8?

Which wall thickness do you want to use


**Edit: I am interested in a 49er brick thickness.

I once looked on, for example, Schlagmann’s website:

[*]T7 with U-value 0.14 (unit price according to Schlagmann about 8.5 EUR)
[*]T8 with U-value 0.16 (unit price according to Schlagmann about 8 EUR)
[*]U8 with U-value 0.16 (unit price according to Schlagmann about 13.3 EUR)

The T7 and T8 are filled with perlite. The U8 is the one with many small chambers, which are supposed to break relatively easily during shell construction (see picture)

I somehow don’t understand the pricing policy at all. The perlite-filled bricks, which are supposed to be more stable, clearly cost less than the one filled with air? Who wouldn’t take the perlite brick (whether T7 or T8)??


Picture from schlagmann (.) de

Hey,

we have the U8 42.5 cm.
You can forget the prices given by Schlagmann directly.
Go to your building materials dealer and have them make you an offer (of course calculate m² or quantity beforehand).
For us, the stone cost about 3.50.

we have the U8 42.5cm.

Have you already started / did you have problems with the fragility of the U8?

Have you already started / have you had problems with the fragility of the U8?

We built in 2017/2018. When laying the bricks, we had no problems with the "whole" stones.
However, the sawn stones were very fragile. We had about 20 stones that broke in our hands... which I still find acceptable. Chiseling/milling grooves for electrical wiring also basically worked without problems... Always with care and common sense.