Alternatives to ETICS with polystyrene?

  • Erstellt am 2015-11-20 22:00:15

Grym

2015-11-20 22:00:15
  • #1
Apart from the monolithic wall construction - aside from that - what are the usual alternatives to ETICS with polystyrene or other plastics? The two things that speak against polystyrene for me: - mechanical durability not given, especially against woodpeckers - fire protection very questionable (fire protection class B1 questionable, whereas other facades easily meet A1) - durability 30 years +/-

How about KS + mineral insulation boards (WLG 0042)? Can stone wool/mineral wool better meet the above requirements instead of EPS? Wood fiber insulation boards have the same problems with fire protection (are probably classified as B2 anyway)? Other alternatives or is it recommended, if one wants to avoid polystyrene, to build more monolithically?
 

Legurit

2015-11-20 22:22:08
  • #2
Two-shell with clinker and mineral wool. Alternatively monolithic.
 

Grym

2015-11-20 23:01:06
  • #3
Still regarding the initial question: clinker bricks are prohibited by the development plan and are generally uncommon here. I have already mentioned the alternative monolithic option.
 

wpic

2015-11-22 16:32:19
  • #4
Mineral wool ETICS is non-combustible A1, but otherwise has the same disadvantages (mechanically not resistant, except with special, proven plasters in the base area or base protection panels) and furthermore the additional disadvantage that it should preferably not be wetted by rain during processing before the plaster is applied. EPS is less sensitive in this regard due to low or almost nonexistent water absorption. Foam glass would also be possible, but is rather uncommon in private single-family house construction because it is very expensive.

Alternative: monolithic (aerated concrete, climate lightweight block, Liapor, etc.) or perforated brick with "internal" ETICS (Poroton perlite/mineral wool). With the latter, the same "sensitivities" during the shell construction phase in the rain also apply. The perlite filling often falls out of cut stones and is not necessarily refilled by the construction company. This may result in unfilled stones that represent thermal bridges.

I would prefer a truly monolithic wall construction if the static conditions cooperate (compressive strength) and the sound insulation proof for the relatively lightweight exterior wall can be provided.
 

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