Hello everyone,
As you can easily see in the pictures, I have a lot of electrical cables that required corresponding chases. Now all the cables are in place, and I need to close the large recesses, especially the big gap at the rear right in the picture.
Should I use the usual patching plaster (such as Knauf Rotband), or are there special materials that are more flexible and less likely to develop cracks over time?
To bridge cracks, I will of course incorporate fiberglass mesh or similar reinforcement.
It is also important to me that the filling material is strong enough to restore at least some structural stability to the masonry, which I don’t expect from Rotband.
Could I possibly use masonry or plaster mortar, or even cement mortar for this? Are NYM-J cables allowed to come into contact with these materials?
Thank you in advance and best regards,
Scami
As you can easily see in the pictures, I have a lot of electrical cables that required corresponding chases. Now all the cables are in place, and I need to close the large recesses, especially the big gap at the rear right in the picture.
Should I use the usual patching plaster (such as Knauf Rotband), or are there special materials that are more flexible and less likely to develop cracks over time?
To bridge cracks, I will of course incorporate fiberglass mesh or similar reinforcement.
It is also important to me that the filling material is strong enough to restore at least some structural stability to the masonry, which I don’t expect from Rotband.
Could I possibly use masonry or plaster mortar, or even cement mortar for this? Are NYM-J cables allowed to come into contact with these materials?
Thank you in advance and best regards,
Scami
Gette094 schrieb:
You mean first filling the gap layer by layer with Rotband; then when I’ve reached roughly the level of the brick face, apply the metal lath over it and afterwards cover with, for example, lime-cement plaster/Rotband?No, apply the metal lath directly over the gap and then plaster it. It still needs to dry properly. That’s how I did it myself. No cracks, the wall became even, and Rotband is easy to work with.
Joedreck schrieb:
No, just put expanded metal lath directly over it and then plaster on top. It still needs to dry, though.
That’s how I did it myself. No cracks, the wall became smooth, and the plastering compound is easy and convenient to apply. But won’t the area beneath the expanded metal lath remain hollow?
superzapp schrieb:
Ah, and communication cables running parallel for long distances to power lines are also not an ideal solution.
Who planned this cable route? Is this new construction or a renovation of an old building? CAT7, so proper shielding, and the 2cm (1 inch) spacing is ensured by a spacer.. 😉
Regarding the electrical installation: except for the kitchen, almost all supply lines are protected with B13 breakers..
Gette094 schrieb:
But the area under the expanded metal mesh remains hollow, doesn’t it?You’re right, I first filled it in and then put the expanded metal mesh over it.
Three years can make quite a difference. That’s why it’s important to let it dry thoroughly.
Joedreck schrieb:
You’re right, I first applied the mortar and then placed the expanded metal lath over it.
That really makes a difference after 3 years. That’s why I let it dry thoroughly. No problem 😀 Thanks!
Gette094 schrieb:
CAT7, meaning proper shielding, and the 2cm (1 inch) spacing is ensured by a spacer.. 😉I don’t see any issue with data cables installed parallel to the power cables. For me, the problem would be if they are not installed so they can be replaced. I would always put them inside a conduit.