ᐅ Attaching a House Number to a Wood Fiber Insulation Facade

Although this is somewhat old information, there are “insulation anchors” like Tox Thermo. Customer service from the prefab house company should be able to assist with this.

I used Tox Thermo 50mm (2 inches) for a mailbox. But be careful: Use an 18mm (0.7 inch) drill bit to remove the plaster layer (without drilling into the insulation layer), then use an 8mm (0.3 inch) drill bit to drill a hole about 2 to 3 cm (1 to 1.2 inches) deep into the wood fiber insulation layer. If the hole is not large enough, the anchor might break due to too much resistance while drilling. It should slide in fairly easily and allow some room. Then fill the gap with painter’s acrylic and fully screw in the anchor. Optionally, apply some more painter’s acrylic on top to prevent moisture from entering the wood fiber insulation. The anchors have holes in the head/ring area, making it easy to inject painter’s acrylic, which then distributes inside.

This is how I did it, but only after consulting with prefab house customer service.

@KalterKaffee – I had just been researching the same thing. The particularly strong Tox Thermo Plus anchors are theoretically rated to hold 10 kg (22 lbs) per screw in wood fiber insulation boards. I want to install curtain rods (each bracket with 2 holes), and the rods with curtains weigh less than 3 kg (7 lbs), so there should be enough reserve capacity for a total of 40 kg (88 lbs). Still, everyone with experience recommends using traditional anchors and screws. Does anyone have experience with this? We have a 6 cm (2.4 inch) plastered wood fiber insulation board on top of old masonry with crumbly plaster in front.

If regular anchors are better, which ones should I use? But how can the pressure on the insulation board be avoided? The leverage is unfavorable at the “front,” right?

Bad_Bremen schrieb:

the especially sturdy Tox Thermo Plus ...

The curtain rods are installed indoors, right? The Thermo Plus anchors are designed for exterior use.

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

My interior walls consist of 9.5mm (3/8 inch) drywall and 16mm (5/8 inch) wood-based panels. My prefab home manufacturer specifies using wood screws with a maximum length of 25mm (1 inch). I don’t need anchors for that. My kitchen cabinets are mounted directly with wood screws.

It all depends on the wall construction.

For interior walls, you have masonry. That should be thick enough so that screws don’t go through to the insulation, right? So I don’t understand why the 6cm (2.5 inches) insulation thickness is an issue here. I would probably just use regular anchors. Is it maybe an older building that was renovated?

KalterKaffee schrieb:

Thermo Plus anchors are for exterior use
....
For interior, you have masonry

No, the Thermo Plus anchors are for both interior and exterior use, according to the website. They are mainly designed for insulation boards and, in our case, they are installed on the interior.

Bad_Bremen schrieb:

No, the Thermo Plus panels are designed for both interior and exterior use, according to the website. They are mainly intended for insulation boards, and in our case, they were installed on the inside.

Sorry, I should have kept quiet and apologized to you. You are probably right. But why can’t the professional company that carried out the work advise you on this?

Well, apologizing might be a bit over the top.

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