Subsequent mounting blocks in ETICS (External Thermal Insulation Composite System)

Hello,

The background of the question is the subsequent installation of shutters on a plastered ETICS façade with 16cm Styrodur and 16cm aerated concrete as the backing masonry. Some installers recommend ETICS thermal anchors for this, while others say that the leverage forces are too great and instead recommend insulating mounting blocks that are bonded to the backing masonry with threaded rods/sleeves/injection mortar. I tend to lean more towards the mounting blocks but, as a layperson, I cannot assess the risks involved.

Now the specific question: If an existing ETICS façade is opened, a piece of Styrodur is cut out, a mounting block is fastened in the backing masonry, the piece of Styrodur is then put back on, re-reinforced, and re-plastered, what risks are involved? Is the "damaged" spot in the ETICS then especially moisture-prone?

Thanks for your tips,

Best regards

So, I know these dowels, we used them to attach outdoor lights. They are okay for that. But if I now imagine 4 such dowels and shutters attached to them, it makes me nervous. I have already seen these mounting blocks, I trust them quite a bit more, but I cannot give a definitive answer to your question.

I know these anchors, we used them to mount outdoor lamps.

We also mounted our outdoor lamps with ETICS anchors (Fischer FID 50), that is not a problem. For the shutters, anchors are surely meant that are anchored in the masonry, for example Fischer Thermax 8/10. From my point of view, that is also sufficient for shutters.

The mounting blocks can be used in addition to the anchor because the insulation is not pressure-stable. Properly and neatly executed, retrofitting mounting blocks is not an issue either. You just have the work with the plaster ...

As a layperson, I would now worry about how the anchor grips in the aerated concrete. The anchor manufacturers should provide information.

Hello, thank you for the answers.

The thermal anchors are out of the question for us, as the shutter manufacturer advised against them. For us, only the mounting blocks (specifically: support brackets TRA-WIK®-Aluminium-RF from Dosteba, [MEDIA=YouTube]De_wbzCLlQw[/MEDIA]) would be an option. They should not be anchored in the aerated concrete (PPW2, strength class 2), but bonded with injection mortar. At least that is what Dosteba recommended to me. What do you think about that?

I would do it that way!

The Fischer Thermax is also available with a 16mm threaded rod, which is glued into a hole in the masonry. That then holds quite a bit, for example, it is used for fastening awnings, sun sails, etc.