Building Homes or Extensions/sweating problem


I live in Manhattan,Il.about 35 Mi. southwest of Chicago. I own a ranch w/ 1/2 basement 3 Mo. old. We just had a wicked cold spell and when I went in the basement I noticed a puddle on the floor. I looked up and saw a 4" pvc drain coming from a bathroom upstairs was sweating so much it left a puddle on the floor. Why is this happening and how can I fix it.

Hi Mark, it's a simple fix really.  The pipe needs to be wrapped with insulation.  The cold water running through the pipe hits the warm air from the basement and condensation occurs.  There are plumbing insulation specialists out there that have special materials for this, or you can do it yourself  with materials purchased from your local big box home improvement store.  You can buy insulation wrap with a foil back.  Wrap the pipe and seal all the seams with peel and stick metal tape or duct tape.  The better the job the better the result.  You might even be able to find the materials the pros use..styrofoam , rubber foam or fiberglass pipe insulation made to fit over specific sized pipes and then seam sealed with special tape and mastic.  You can get it in one or two inch thickness.  I hope this information helps please feel free to write again regarding this or other matters, sincerely Bruce

Building Homes or Extensions

All Answers

Answers by Expert:

Ask Experts


Bruce E. Johnson


I can answer any construction related question in regards to carpentry, concrete, drywall, masonry, structural elements of any type of building, residential or commercial. Interior or exterior.


Custom Commercial and residential buildings. Churches, theaters, schools and auditoriums. Most recently I am working with the Catholic Church on several design build committees. I have a website related to scheduling and project supervision. Although my expertise is more related to multimillion dollar commercial, educational and theatrical projects my generous credentials in residential and remodelling construction make me a viable source of information regarding all forms of building questions.

©2017 All rights reserved.