Don't know if this question belongs in the right forum, but it was the closest I could find (the alternative would have been under "floor")...
I'm trying to make a hole (for a new kitchen drain) in the floor structure between the living area and the basement in a house built in '43. Basement walls of concrete block, the rest of the structure is wood. But I hit a snag, I get stuck halfway in something hard and only ruin the wood drills! I need to get an extra-long drill for something else, but for what?
The floor structure is about 30 cm thick and consists of (from top to bottom):
1. Floorboards (tongued and grooved, about 30 mm thick)
2. Joists, about 100 mm high, with wood chips in the gaps)
3. Black paper
4. Another wooden layer (unknown thickness)
5. SOME HARD MATERIAL (unknown thickness, but likely not over 10 mm)
6. Joists, about 100 mm high, with wood chips in the gaps)
7. Black paper
8. Ceiling boards (roughly planed, about 20 mm thick)
9. Gypsum board
It's fine to drill both from above and below, up to layer 5 in the middle.
It doesn't sound like stone but not metal either. I've tried in several different places so I don't think it's a protective plate for cables or the like.
Anyone have an idea of what this could be? Eternit?
I'm trying to make a hole (for a new kitchen drain) in the floor structure between the living area and the basement in a house built in '43. Basement walls of concrete block, the rest of the structure is wood. But I hit a snag, I get stuck halfway in something hard and only ruin the wood drills! I need to get an extra-long drill for something else, but for what?
The floor structure is about 30 cm thick and consists of (from top to bottom):
1. Floorboards (tongued and grooved, about 30 mm thick)
2. Joists, about 100 mm high, with wood chips in the gaps)
3. Black paper
4. Another wooden layer (unknown thickness)
5. SOME HARD MATERIAL (unknown thickness, but likely not over 10 mm)
6. Joists, about 100 mm high, with wood chips in the gaps)
7. Black paper
8. Ceiling boards (roughly planed, about 20 mm thick)
9. Gypsum board
It's fine to drill both from above and below, up to layer 5 in the middle.
It doesn't sound like stone but not metal either. I've tried in several different places so I don't think it's a protective plate for cables or the like.
Anyone have an idea of what this could be? Eternit?
Hmm
Really only 10 mm thick?
Does it feel smooth or bumpy on the surface?
Do you get a ringing sound when you tap on it?
In the past, it was common to pour various leftover materials into the joists.
In some cases, slag was used for insulation.
However, I've never encountered asbestos cement boards inside joists.
Have you tried drilling with a concrete drill?
Really only 10 mm thick?
Does it feel smooth or bumpy on the surface?
Do you get a ringing sound when you tap on it?
In the past, it was common to pour various leftover materials into the joists.
In some cases, slag was used for insulation.
However, I've never encountered asbestos cement boards inside joists.
Have you tried drilling with a concrete drill?
Well, I finally managed to create a hole and discovered that it was some sort of hard stone slab. Since the location is near the corner between an interior wall and an exterior wall and the room below previously housed an oil tank and such, I guess there is some connection. Or just stabilization of the partition wall against the exterior wall.
Imagine that a theoretically simple project ("Drill a 50 mm hole in the floorboards, go through the insulation with a long wood drill and create a guide hole in the basement ceiling, and then drill a corresponding 50 mm hole in the ceiling") can become so complicated in practice. Well, now at least I know that I have crisscrossed floor joists and a board layer between them too.
Imagine that a theoretically simple project ("Drill a 50 mm hole in the floorboards, go through the insulation with a long wood drill and create a guide hole in the basement ceiling, and then drill a corresponding 50 mm hole in the ceiling") can become so complicated in practice. Well, now at least I know that I have crisscrossed floor joists and a board layer between them too.
Well, I was thinking about that too, but why on earth have a fire protection in the middle of the floor structure, with both beams and chipboard both below and above, instead of directly in the ceiling? Maybe all the "real" builders were mobilized for defense in '43? 