For many people, upgrading the home seems impractical. But updating certain parts of your house may provide health benefits that could make it worth the cost
To create holes, use a brace and bit to drill through the flooring, and then a keyhole saw to widen the entrance. Make sure that the holes are not exactly above a floor joist when you drill them. In fact, the joists & studying must be spared as much as possible while installing the water heater equipment.
Tape each joint after applying a layer of compound. Water may assist embed the tape if the compound is thinned down a little. Using the 6-in. knife, smooth out any bubbles in the tape by dragging the tape outward from the center toward the ends.