Key points
- Cold pipes collect condensation when warm, humid air hits them.
- It looks like a leak but the pipe isn’t broken.
- Steady dripping can stain ceilings, rot subfloors, and grow mold.
- Foam pipe insulation is the usual fix.
Where it happens
- Cold water lines in basements and crawlspaces
- Toilet tanks in humid bathrooms
- AC lines and ducts in summer — see AC leaks
- Water lines near swamp coolers
Sweating or leaking?
Dry the pipe completely and wrap a paper towel around it. If water beads all along the pipe, it’s condensation. If it collects at one fitting or joint, it’s a leak.
Fixes
- Insulate cold water lines with foam sleeves.
- Lower indoor humidity with ventilation or a dehumidifier — see dehumidifier settings.
- Check the area below for stains or soft spots.
- Dry anything that’s been getting wet.
Long-term dripping can cause hidden damage. Vault checks with moisture meters and thermal imaging. Call (385) 250-2825.
Water stain from a pipe?
Call (385) 250-2825 — answered live 24/7 by the Vault crew.
Water damage services · Hidden water damage · Crawlspace water damage