moisture and ice on concrete basement wals
I do not agree with opinion of my builder that it happens during the first year when the concrete is still curing because the condensation would appear on the whole area of concrete wall rather than showing up only at the area – top of the concrete wall and the level of the ground. The level below is fine and dried up.
In my opinion I will have the same problem every year not just this year.
I do not know what to do with the mold which already started to grow in the pockets mentioned above. I also would like to mention the level of relative humidity in a house is approx. 30-35% and I can not go lower than that as I’ve been instructed to maintain it at this level because of hardwood flooring I have in half of the area of the house. I would appreciate any advice I could get from anyone. Forgot to mention I live in Winnipeg, Manitoba where temp now is -25C
Thanks a lot
And what you are exeperiencing is completely in line with the physics of your basement.
But even at a 'normal' 30-35% relative winter humidty, the fact that your basement walls below grade will remain at a relatively constant 55degrees F but the upper portions of your wall can and will drop to nearly the -25C you are experiencing only goes to support the fact that the upper walls are cooling the air below the dew point while the lower walls are not.
For example, at an interior temperature of 70 degrees F and a relative humidty of 35%, the dew point (Condensation point) is only 40 degrees F. Any surface that cools below this level has the potential to create condensation and icing.
Obviously your upper walls are well below 32F or 0C since the condensation is freezing only above ground, and not below.
If you have open web concrete blocks for your basement walls and the webs remain open at the top, this will only add to your existing problem.
The reason is that ground water vapor will enter the block cavities, move up and out of the block cavities at the top of the wall thru convection, increase the relative humidty in these pockets below the subfloor and the top of the block wall, and increase condensation and the dew point.
The only ways you can reduce this problem is to dehumidify the basement, add foam insulation on the outside of the house foundation above the ground, and to fill the webs in the block at the top of the wall to block moisturef rom entering the basement.
- 15 Old House Features We Shouldn't Abandon
- 17 Tiny Bathrooms We Love
- 20 Insanely Easy 60-Minute Home Improvements
- 70 Gardening Tricks and Ideas for Beginners
- 16 Inventive Beds You Can Make Yourself
- Capitalize on Your Attic: 10 Inspirations
- 15 Once-Popular Items Now Vanishing
- 159 Smart Storage Ideas for the Whole House
- 30 Things Every Adult Should Know How to Do
- 16 New Ways to Store Kitchen Necessities
- 12 Garden Sheds You Could Live (or Work) In
- Design a Rustic Bathroom: 10 Inspirations
- 7 Easy Budget-Friendly Backyard Makeovers
- 283 Great DIY Project Ideas
- Picture-Perfect Patios: 10 Outdoor Spaces to Love
- 10 Clever Uses for Space Under Stairs
- 17 Backsplashes for a Unique Kitchen
- Assembly Required: 15 DIY Kit Homes
- 16 Ways to Use Salvaged Wood in Your Home
- 108 Easy Outdoor Living Ideas
- The Right Path: 15 Wonderful Walkway Designs
- Decked Out: 12 Innovative Outdoor Living Designs
- 14 Room Dividers to Organize Your Space
- 15 Eye-Catching Options for Your Front Door
- 15 Unexpected DIY Flooring Alternatives
- 8 (Truly) Unexpected Storage Spots
- 12 Celebrities' Cool Pools
- 1 Dozen Ways to Maximize a Small Yard
- 9 Easy-to-Make Garden Luminaries
- Colorful Kitchens: 10 Bright & Bold Designs