Roof, attic, intermediate ceiling - How to dispose of old mineral wool?

Hello everyone,

we recently bought a house (built in 1994) and are now busy renovating.
The insulation in the ceiling between the upper floor and the attic (currently not insulated at all) is to be renewed.

The structure from below is as follows:

Drywall
Blue foil (vapor barrier)
Mineral wool (collapsed and not sealed -> to be replaced)
Chipboard

We now want to remove the chipboard from above, take out the old mineral wool, install new insulation, and lay tongue-and-groove boards with about 1-2 cm gaps on top.
Additionally, the attic is to receive insulation between the rafters (-> mineral wool and simply drywall in front). We were advised against or considered unnecessary to use a vapor barrier with the insulation between the rafters, since it apparently cannot be made 100% airtight afterwards anyway, and in an older house air circulation must be ensured regardless.

So far so good, but I have two big questions:

- What is the best way to remove the old mineral wool and transport it out of the house?
The attic only has a tiny window, and the large mineral wool bags don’t fit through it.
Should I pack the wool as airtight as possible into blue bags up in the attic and then carry it through the house to the outside (or out the window on the upper floor)?
I would rather not spread the fibers all over the house, but I don’t really know how to avoid this either. Or am I worrying too much about this?

- Is this procedure okay as planned? According to the roofer, it can be done the way we have planned it.

Best regards

I find it difficult to imagine that the mineral wool is sagged in the horizontal installation. I rather suspect an intentionally lower filling height than the construction height of the ceiling joists. According to the description, there are only the plasterboard panels under the joists, so only lightweight inserts are probably recommended. For that reason alone, I would put a question mark behind the idea of installing more material volume there. Even with a firmer boarding of the joists from below, it does not have to be the ultimate solution to add more material there. With the insulation between the rafters, another insulation is already planned anyway. I do not understand the idea of disposal at all, especially if the same material is to be reused; then I would only supplement it. How is the assembly even known - have fields already been opened? Is a controlled residential ventilation system and/or ceiling spotlights even being considered in the overall measure?

Hello :-)

So, we opened up panels in the attic and there were spotlights installed from below in the bathroom. When we removed them, you could see this as well. There was 160mm insulation wool inside. However, mice had been living there, so everything is covered in droppings and the insulation just doesn’t look sealed/neat anymore. The new insulation should also only be 160mm thick, so it will be the same weight.

Regarding disposal, it’s mainly about carrying it out from the attic to the outside. You read everywhere that you should definitely avoid spreading the fibers of the wool inside the house. So I wonder if it is possible to avoid this somehow when removing the old wool.

(No additional) ceiling spotlights are to be installed on the upper floor.
What is a Controlled Residential Ventilation?

However, I would only dispose of the Mäusewolle and reinstall the rest. A Controlled Residential Ventilation is a Controlled Residential Ventilation whose ducts are also installed in ceilings. This should then be done accordingly if desired.

Is the removal and carrying out of the old wool through the house to the outside unproblematic, or how should one best proceed there? Unfortunately, I cannot assess this and do not know how this is otherwise accomplished...

Is removing and carrying the old wool through the house to the outside unproblematic or how should one best proceed there?

I would bag mouse wool with gloves and respiratory protection, non-contaminated wool I would, as said, reinstall.