A thin mousepad, or rug gripper, or rubber jar opener in between the tushy and the toilet should help; it needs more surface area + something less smooth than the porcelain and plastic.
There are two nuts at the hinge point of the seat, up underneath the porcelain flange. Tighten those down (don't over tighten) and the seat will stop sliding around.
The toilet bowl will generally wobble if (1) it is not snugly secured to the floor via the toilet flange; or (2) because the floor is uneven (or the flange is not properly seated to be flush with the floor).
First check the rubber gasket between the toilet and drain flange. Replace wax ring if that's what you're using (I prefer the rubber ones). Re-seat the toilet, tighten the retainer bolts and insert plastic shims in the gaps around the edges. There are special shims for this available at the hardware store.
It could be a broken flange, loose mounting bolts, or a worn-out wax ring. Once this is done, turn off the water supply, remove the toilet, and inspect the flange and wax ring. The next step is to repair or replace any damaged parts.
The most common cause of a wobbly toilet is loose toilet bolts. These bolts secure the toilet to the floor flange. Over time, they can become loose due to regular use, causing the toilet to rock back and forth.
If the toilet is loose from the floor, the material in the flush can leak out. That's about as raw as you can get when it comes to sewage. When a toilet rocks or wobbles, the wax seal around the toilet base gets compromised and starts leaking water from waste pipes. Most toilets have a wax ring or seal under them.
The wind pushes and pulls on air within the pipes, sending a ripple effect through the system that's apparent when the water in your toilet bowl starts sloshing around. Gustier winds make the effect more pronounced.
For the wastewater line, an offset toilet flange will allow you to move the toilet a couple of inches in any direction without having to cut a new hole in the floor or reconstruct the wastewater pipe.
Toilet seats may loosen for a variety of reasons: the repetitive motion of raising and lowering the seat and cover, plus the fact that it's one of the most-used places in the house. Having a loose toilet seat isn't merely annoying; it's also a safety concern.
Reasons to Caulk Around a Toilet
Moisture Prevention: Without caulk around the toilet base, external water can seep under the toilet, leading to floor and subfloor damage over time. This is especially important in bathrooms with wooden floors, as prolonged exposure to moisture can lead to rot and structural issues.
See whether you can jiggle either of the bolts underneath with your fingers. If a bolt is loose, simply use a socket wrench to tighten the nut until you feel some resistance. (Beware of overtightening — you don't want to crack the porcelain of the toilet itself.)
How much does it cost to get a new toilet installed these days? With average costs for toilet installation ranging from $224 to $533, most people around the country are paying $374 for toilet installation costs. While they are paying $120 on the lower end, installation costs can go as high as $826 in some cases.
Tighten the Closet Bolts
If your toilet is wobbling or rocking but you haven't noticed any leaks, the nuts on top of the closet bolts may have simply become loose. Using an open-ended wrench, gently tighten the nut on the closet bolt until it feels firm. Use caution to not overtighten the nuts.
You can add a dab of caulk below the shims to help them stay in place. Let the caulk dry overnight before trimming the shims.
Loose Toilet: When the wax ring fails, the toilet becomes loose. A new wax ring installation or repair costs $50–$200.
Several things could cause a toilet to wobble — loose bolts, an uneven or rotting floor, or a damaged toilet flange.
While a rocking toilet doesn't require an emergency call to your plumber, it does mean that you should be planning to fix it yourself or have a professional take a look soon. If your toilet looks like it's less than secure, it's time to call a professional.
Ghost flushing, or phantom flushing, occurs when your toilet tank refills independently without anyone pressing the handle. Water leaks from the tank into the bowl, causing the fill valve to activate periodically to refill the tank. It's similar to your toilet flushing itself, but it's just refilling.
The most common cause for a high water bill is running water from your toilet. A continuously running toilet can waste up to 200 gallons a day or more depending on the volume flow down the drain. This can cause a terrible increase to a family's typical water use, so fix toilet leaks as soon as possible.
Toilet flappers usually last for about 3 to 5 years, but the lifespan can vary depending on factors such as the quality of the flapper, the water quality, and the frequency of use.