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Yes, you can install a basement bathroom without breaking concrete by using an upflush toilet system, which includes a macerator pump. These systems sit on top of the concrete floor, so you don't have to drill into it to install plumbing. The macerator pump breaks up waste until it is soft enough to pass through a discharge pipe to the main sewage line. This method saves you time and money by bypassing the need to break concrete to connect drain pipes.

Yes, you should screw your flange to the subfloor, including cement. The best way to get this done is to predrill holes into the concrete using a hammer drill and a ¼-inch concrete bit. Be careful when you’re ready to bolt your flange down, as you can accidentally crack it. You can avoid this issue by not installing the screws too deep. Or, you can opt for a flange with a stainless steel ring so you don’t have to worry about cracking the plastic.

Yes, you’ll need to replace your toilet’s wax seal any time you move the toilet. This is because movement of the toilet will break the seal, rendering the remaining wax useless. Thankfully, replacing a wax seal is fairly easy, and the seal itself only costs $2 to $10 at most home improvement stores.

When replacing a wax seal you typically also have to replace the closet bolts that secure the toilet to the flange. These are usually about 2.5" - 3" long and have to be cut once the toilet is secure. Cutting them usually makes them too short to reuse.

Most codes require 15 inches on either side of the toilet's centerline (from the wall or vanity) and at least 21 to 24 inches between the toilet and the wall in front of it. These codes ensure that your toilet is easy to use and access, even in small bathrooms. Check your local building codes for the exact measurements required.