Are the solar systems and solar wiring installations compliant with standards?

Our installer started with the installation of the solar systems and thought that as long as the scaffolding was still up, he might as well finish the roofing work, for example solar cables, roof ventilation, exhaust pipes. Now he has suddenly laid the drain pipes without my knowledge. Now to my questions, do the cables from the solar system to the house also need to be insulated? Is the penetration through the underlay membrane compliant with standards? Is the fastening of the solar cables with cable ties to the roof structure compliant with standards? Is laying the drain pipes on Styrodur compliant with standards? In addition, I informed the installer that I would like all exterior walls plastered, even if they are box-formed. He said that the plasterer would surely get behind the pipes. What would you do in my place?

I think your installer did a clean job.

I also think that he worked very well and conscientiously. This calls more for a tip than criticism.

I also think he worked very well and conscientiously. Tip rather than criticism is due there

Also the laying of the drain pipes on Styrodur?

Yes, everything has been carried out very meticulously according to the pictures...

It already looks very neatly done.