Aug 28, 2011When Pipes Sweat: Causes and Cures For Sweating Pipes. The warmer air temperature and excess humidity in the air meet with the cold walls of the pipe through the process of convection and condensation begins to form, sometimes in large enough amounts to leave puddles on the floor or, in this case, a water trail (see picture below). Jun 11, 2011Foam pipe insulation sleeves prevents condensation on plumbing. Prevent damage to carpets and the basement floor during the summer months. Pipe sweating is just one symptom of excessive dampness. Even basements that have never had a visible water leak share the misery water vapor in the ground virtually forces large amounts of water vapor through the floor and foundation walls. Mar 30, 2006It is the temperature gradient which dictates whether or not pipes will sweat. If the ambient temperature of the surrounding space is lower than. Why does water condense on your cold water pipes overhead in the basement before it condenses on the steel Lally columns supporting your main girder? It's because the cold water pipe surfaces are colder than the Lally column surfaces exposed to the same moistureladen air. The sweating pipe is carrying all the new, cold, water flow from the relatively cold ground outside, and the dry pipe is carrying little or no water flow. If no water is demanded by fixtures to make water flow through the pipes then the water will remain warm at room temperature, and not sweat. Sweating occurs when the water inside the pipe is much colder than surrounding humid air. During the summer, the surrounding air is naturally hot; in winter, the air is heated by the furnace. In either case, when warm, humid air reaches cold pipes, drops of moisture form and drip as if there was a tiny hole in the pipe. Aug 22, 2008Sweaty walls and pipes likely signal trouble. The concrete in your basement walls and floor will absorb the heat from the exterior temperature in the summer, which makes it warmer that your conditioned air. When the air in your basement meets the concrete wall, the moisture in it will condense and your walls will sweat. The truth is, pipe sweating is just an indication of extreme dampness or humidity in your basement. Even when there are no leaks in your basement, large amounts of water vapor can enter it, and, eager to become water again, latches on to any cold surface around. You guessed it right water pipes. The insulated tubing keeps the warm humid air from condensing on the cold pipes. Insulating hot water pipes offers little advantage beyond the possibility of getting hot water sooner at faucets far from the water heater. Jul 30, 2004I'm not sure why they sweat, could be the humidity level of the basement (67) or from the natural gas. However, all basement walls appear dry most of the time. The basement is unfinished, so it's not being used as a living space. The gas pipes are running across the ceiling above the basement, directly underneath the first floor joists. Sweating pipes occur when the water inside the pipe is colder than the humid air surrounding it. While this may seem like a problem exclusive to summer, it also happens when were heating our Portland homes in winter. When warm, humid air meets cold pipes, moisture beads on the outside of the pipe.