Attach house number to wood fiber insulation facade

It's quite old, but there are "insulation anchors," like Tox Thermo. The customer service of the prefabricated house company should help with that.

I used Tox Thermo 50mm for the mailbox. But be careful: Use an 18mm drill bit to remove the plaster layer (but do not drill into the insulation layer), and then use an 8mm drill bit to drill a hole about 2 to 3 cm deep into the wood fiber insulation. If the hole is not big enough, the anchor might break while drilling due to too much resistance. It should glide in relatively easily and leave some space. Then, use painter’s acrylic in the gap and screw the anchor all the way in. Possibly add some more painter’s acrylic on top so that no moisture gets into the wood fiber insulation. The anchors have holes at the head/ring, where you can easily inject painter’s acrylic, which then spreads inside.

This is how I did it, but not without consulting the prefabricated house customer service.

- what you wrote, I had just researched as well, the particularly sturdy Tox Thermo Plus theoretically hold 10KG per screw in wood fiber soft mats. I want to install curtain rods (2 drill holes per bracket), the rods and curtains weigh less than 3 KG, so there should be enough reserve for the 40KG. Nevertheless, all people with experience recommend conventional plugs and screws. Does anyone have experience? We have plastered 6cm wood fiber soft mats in front of old masonry with crumbly plaster on top. If it should be normal plugs, then which ones? But how can the pressure on the soft mat be avoided? The lever is "in front," which is unfavorable!?

the particularly stable Tox Thermo Plus ...

The curtain rods are inside, right? The Thermo Plus anchors are for outside.

For inside there are the Thermo Spiral and Spiral Plus -- for drywall. I use those for the ceiling (lights, fan).

My interior walls are 9.5mm drywall and 16mm wood composite board. My prefabricated house manufacturer says "use wood screws with a maximum length of 25mm" for that. I don’t need any anchors. My kitchen cabinets are attached directly with wood screws.

It all depends on the wall construction.

For inside you have masonry. That should be thick enough so that no screw goes through into the insulation, right? That’s why I don’t understand why the 6cm insulation matters here. I would probably also use normal anchors there. Is it probably an old building that was renovated?

The Thermo Plus plugs are for outdoors .... For indoors you have masonry

No, the Thermo Plus are for inside and outside, see website. They are mainly for insulation boards and in our case they are attached inside.

No, the Thermo Plus are for indoor and outdoor use, see website. They are mainly for insulation boards and in our case, they are installed indoors.

I'm sorry, I should keep quiet and apologize to you. You are probably right. But why can't the specialist company that carried out the work advise you on this?

Well, apologizing now might be a bit much. The guys don’t work on weekends and I don’t want to bother them for every little DIY thing. But since there doesn’t seem to be a forum in the German-speaking area (or does anyone know of others?!), where many people have experience with such practical life matters, I guess I have to ask them after all );