Hello everyone,
We are building a KFW 55 house. Now a question has come up for us: Should the shafts installed by the electrician for the cables be filled with a special mortar (insulating or similar), or is it sufficient to use regular mortar?
Best regards,
Ramona_91
We are building a KFW 55 house. Now a question has come up for us: Should the shafts installed by the electrician for the cables be filled with a special mortar (insulating or similar), or is it sufficient to use regular mortar?
Best regards,
Ramona_91
S
Sebastian7931 Dec 2015 14:02Of course, you can use mortar; what would deform there – especially if a lime-cement plaster is applied afterwards.
If using gypsum plaster, then fill the gaps with that material, although only larger slots need to be prepared beforehand, the rest will be handled by the plasterer during the plastering process.
If using gypsum plaster, then fill the gaps with that material, although only larger slots need to be prepared beforehand, the rest will be handled by the plasterer during the plastering process.
Sebastian79 schrieb:
what is supposed to deform thereThe boxes will deform if you use cement/mortar because, unlike plaster, it shrinks significantly as it dries.
It’s only a matter of a few millimeters (inches), but that is enough to cause socket inserts to be misaligned afterward.
S
Sebastian7931 Dec 2015 15:51I cannot confirm that... and everything was sealed with mortar.
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Peanuts748 Jan 2016 12:36Regarding the initial question, for a new house the energy demand is calculated based on the insulation values of the walls, windows, etc. No one actually measures the real value afterward. So, it doesn’t matter at all for KfW.
In our case, the plasterer simply plastered everything, and so far everything is perfect...
In our case, the plasterer simply plastered everything, and so far everything is perfect...
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