Author Topic: Basement Floor Dampness  (Read 688 times)


  • Stubble
  • **
  • Posts: 135
  • Age: 50
  • Location: MA
Basement Floor Dampness
« on: June 03, 2018, 09:15:35 AM »
The concrete floor of my 1920 build house's basement gets large wet spots, 4 ft x 4 ft for example in about 15-20% of the floor.  It doesn't actually ever puddle.  I get mold of some of the stuff stored there.  The dampness seems to get larger a few days after rain, but I'm not entirely sure about that.  I imagine that the water from rain slowly flows underground and wicks through to the floor.

I do not have gutters on my house.

Do you imagine gutters would help?  French drain?  Machine to collect humidity?

Goal would be to keep everyone from getting sick - I have not traced illness to this, though - and to be able to store stuff there, mold free.



  • Bristles
  • ***
  • Posts: 268
  • Location: Canada
Re: Basement Floor Dampness
« Reply #1 on: June 03, 2018, 09:27:33 AM »
Is it a humidity so bad it's pooling issue?  Or water coming into the house issue?  Or both?

I'm dealing with basement humidity now as well.  I got a humidistat at the hardware store for like $20 and it shows what % humidity the basement is.  From what I've read, 40 to 50% is supposed to be optimal.  I'm 53% up to 60% at times, so am looking for a used dehumidifier on Craigslist.


  • Pencil Stache
  • ****
  • Posts: 552
  • The Stewardess is Flying the Plane!
Re: Basement Floor Dampness
« Reply #2 on: June 03, 2018, 09:49:56 AM »
Rule #1:  Water wins.  It can ruin the house, straight up kill it.  Like mold-in-the-walls and footings-turned-to-sand type of destruction.  If the situation persists it may be very difficult to sell one day.  The only answers are to divert it from the outside and remove what gets inside.   

At minimum you do need gutters, every home needs them. 

It also sounds like you might need a French drain and/or sump pump depending on the water table in your area.  That level of dampness is an indication that there is hydrostatic pressure around the foundation and floor causing the water to find its way in.  Get some professional advice on the cause and fix from an engineer.