K.Brodbeck
2014-01-28 11:44:36
- #1
This is how we build as well, but we will even end up below KfW40. A well-insulated building envelope is paid for only once and from then on has savings effects that are always there. No maintenance and expensive renewals are required, as is the case, for example, with a heat pump, etc.
With windows, the price is driven much more by the material (e.g., wood-aluminum vs. plastic) than by the thermal insulation properties (double vs. triple glazing).
The same applies to masonry: expensive Poroton and cheaper Twinstone or Gisoton offer the same thermal insulation values, but with Poroton you have the classic traditional red bricks. You have to weigh what is more important to you.
You can also build well-insulated relatively cheaply.
With such 'combination stones', I think caution is warranted!
Poroton is available with perlite (good) and with mineral wool (MW, I would stay away from that). Twinstone is an aerated concrete block (if I have seen that correctly), similar to the Yong system. From an ecological and building biology perspective, aerated concrete blocks and Poroton with perlite can certainly be rated as good. Gisoton, on the other hand, has a foam filling, which I would avoid.
Besides the price, there are other decision criteria that can be considered.
A filling made of mineral wool or foam certainly restricts vapor diffusion through the masonry (although if the inside of the house is painted with dispersion paint, it all doesn't matter anyway).
Regarding aerated concrete, I have heard disadvantages concerning sound insulation (you hear a lot from the street, or vice versa) and mechanical fastening of objects to the wall (screwing), but I have no practical experience with it!
Best regards
K. Brodbeck