why does my toilet sweat so bad

Toilet tanks sweat due to a difference in temperature between the water in the toilet tank and the air outside. Toilet tank water is cold, making the surface of the tank cold. When the warm air in the room comes in contact with the cold tank, condensation develops on the surface--commonly known as sweating. This is a common issue for homeowners in the spring and summer months when the weather is warmer. Even if the wetness of the tank does not bother you, the perspiring tank can drip water down onto the floor and, over time, cause damage to your flooring and subfloor. You have several options to choose from to stop toilet tank sweating.
Begin by shutting off the main water valve to the entire house.


Then drain the hot-and cold-water lines by opening up all the sink and tub faucets and flushing all the toilets. To avoid scorching the internal components of the valve with a soldering torch, make all connections to the valve with brass compression adapters ($1. 50 each). Loosely thread a 5/8 x 5/8-in. compression adapter into each of the three valve ports. Hold the valve against the horizontal cold-water pipe with the lower inlet port even with the pipe. Note where the center outlet port of the valve intersects the vertical pipe section; mark that spot on the pipe. Also mark the location of the lower inlet port on the horizontal pipe.


Then use a hacksaw to cut out the pipe section. Next, solder a 90-degree L-fitting to the vertical pipe coming down from the toilet, then extend it with a 6-in. -long stub of 1/2-in. -dia. pipe. Use lead-free solder and a MAPP gas torch. Lead-free solder is relatively hard, and MAPP gas burns hotter and works more quickly than propane does. With the cold-water line ready for the valve, locate a nearby hot-water line and cut out a section to accept a new copper T-fitting. Splice the T-fitting into the line and assemble a short vertical riser pipe with a 90-degree L-fitting and short horizontal pipe stub. Point the stub toward the spot beneath the toilet where the valve will be installed.


Solder the T- and L-connections. Add a length of pipe to reach the valve location. Valve Installation Lightly coat the male threads of the three brass compression adapters with a pipe joint compound (pipe dope). Thread the adapters into the valve ports and tighten them with a wrench. Slide a nut and compression ring onto each pipe end and insert the pipes into the adapters. Coat each compression ring with pipe dope and thread the nuts onto the adapters. Tighten each nut with a wrench. Turn the main water valve back on and look for leaks. Temperature Check A slotted screwdriver is all you need to adjust the temperature of the water flowing through the valve.


Start by turning the cold-water adjustment screw counterclockwise all the way. Then turn the hot-water screw clockwise until it bottoms out. That will fully open the cold-water side and shut down the hot water. Next, flush the toilet and open the hot-water side by turning the adjustment screw counterclockwise half a revolution. After waiting an hour or so, check for any condensation on the toilet. If necessary, open up the hot-water side of the valve a little more. Finding the optimum water temperature will likely take several flushes over a couple of days. However, once the water in the tank nears room temperature, the sweating will end.

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