In a hall/utility entrance in a former garage, there is an "indentation" (65x65cm) in the house wall where a boiler used to be. This "indentation" now contains a district heating unit and a floor heating unit will also be installed in the space.
The "indentation" has a higher floor level than the floor in front. This is because the floor in the indentation is the concrete slab on which the house itself is built, and the floor in front/outside is the old garage slab which is about 15cm lower in level. On the floor in front of the "indentation," i.e., on the lower garage slab, there is a floor drain that has been used for wastewater from the expansion tank. There has also been a cold water tap on the wall above the drain, for example, for filling buckets when washing cars.
We will now insulate and raise the lower garage floor with Platon mat, foam, and a suitable top floor to combine with the floor drain. We have considered using a layer of fiber-reinforced leveling compound on top of the foam, then a waterproofing layer and tiles. The new floor height will be about 12cm higher, almost the same height as the "indentation" floor height. The floor drain will therefore be replaced and raised.
There is also an electrical panel on the wall above the floor drain and the old tap (next to the "indentation").
1. What rules apply to the floor and walls around the plumbing installations, moisture, electricity, and fire safety?
2. The floor drain is necessary, but are the requirements the same regardless of whether the water tap on the wall is retained or not?
3. Can pipe penetrations be made on the wall above the floor drain (not directly below a possible tap but right next to it)?
4. Is it okay to have a tap under the electrical panel?
5. Is it okay to use regular gypsum boards as wall cladding around the space?
