Hello,
I would like to install a punching bag in our future training room. The ceiling is concrete (the room is located under the garage on the slope floor). I just talked to the guys who built the house foundation, and they said that the embedded underfloor heating pipes in the concrete slab are above the rebar, which in turn is 3 cm from the "bottom surface" of the concrete.
The punching bag I want to install weighs about 60kg, and the bracket can be screwed at four points about 15-20 cm apart. The bracket consists of a hook that can rotate, and the bag will then hang from a spring on this hook.
Since I don't want to risk hitting any water pipes, I'm wondering if anyone knows if it's sufficient to go only 3 cm into the concrete with plugs and screws, or if there's a risk that the ceiling could crack when you hit the bag?
I would like to install a punching bag in our future training room. The ceiling is concrete (the room is located under the garage on the slope floor). I just talked to the guys who built the house foundation, and they said that the embedded underfloor heating pipes in the concrete slab are above the rebar, which in turn is 3 cm from the "bottom surface" of the concrete.
The punching bag I want to install weighs about 60kg, and the bracket can be screwed at four points about 15-20 cm apart. The bracket consists of a hook that can rotate, and the bag will then hang from a spring on this hook.
Since I don't want to risk hitting any water pipes, I'm wondering if anyone knows if it's sufficient to go only 3 cm into the concrete with plugs and screws, or if there's a risk that the ceiling could crack when you hit the bag?
Thank you for your response. When I asked at a hardware store, they said that plugs worked just as well, if not better than expanders. There was something about expanders requiring greater precision for the hole, which could be hard to achieve with regular svenson-tools... I don't know. But you don't think there's a risk that the bolts will tear the ceiling if they're only 3 cm in?
I have only used an expander once in my 16 years in the industry, and it was for the exact same purpose. The advantage of the expander is that the more you pull/tug on it, the more it expands and the tighter it holds. If the ceiling is well cast all the way down (and only spackled and painted), I don't think it should be a problem. As long as you have a good hammer drill, drilling the holes shouldn't be an issue either.
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