Basement Moisture/humidity Issues - Remodeling - DIY Chatroom Home Improvement Forum

Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Remodeling


Thread Tools Display Modes
Old 09-11-2012, 11:46 AM   #1
Join Date: Sep 2012
Posts: 2
Rewards Points: 10

Basement moisture/humidity issues


My wife and I just bought a house ~6 months ago in Hudson Valley, NY. It is a split level built ~1987, and has a finished basement (that is semi- below grade) and has a thin layer of old carpet on the floor. We are having some issues with humidity/moisture in the basement and are trying to work out the best way to address it.

Here is a timeline of our experiences so far, which should give a better indication of the nature of our issue:

We first inspected the home in late-fall last year, and were happy to see that the basement seemed very dry and without much odor (other than that usual basement smell). This was despite a VERY wet late-summer, and that other homes that we inspected around that time exhibiting significant water in the basements. This was a significant reason for choosing the house mentioned above - we did not want to deal with a wet basement!

We finally closed the sale and moved in around 6 months ago (early-spring). The basement still had that typical basement smell, but seemed quite dry and similar to how we remembered it during the initial inspection. However, since then the mustiness in the basement has slowly increased over the spring/summer, to the point where humidity is ~70-80% and we have found minor amounts of mold on the surface of the interior drywall.

In response to this we have cleaned the affected areas of the walls with bleach and bought a dehumidifier. This has reduced the humidity (and associated smell) significantly, but we would like to explore a more permanant fix to give a healthy, warm living space that doesn't require constant use of a power-sucking dehumidifier.

Attached are 2 photos. One is of the outside of the house showing the grade (water flow direction from right to left of the picture). The other picture is of the inside of the basement. The divide in the drywall is roughly in line with the outside grade. To put the inside/outside in perspective, the photos show the same window (the window seen in the photos is one and the same).


1) Given the photos and timeline described above, what is the likelihood that there is water coming through the wall (and possibly mold behind the drywall)? From the timeline I feel that this it is only water vapor pushing through the basement wall/floor due to differences in hydrostatic pressure. Is this too big an assumption? Should we consider ripping out the lower portion of the drywall (below grade), apply a type of sealant/waterproofing, and then refinish??

2) What is a good flooring option? We would like to keep some type of carpet as we plan to use the space extensively during the winter. At the moment we are considering an indoor/outdoor carpet (100% synthetic) on top of some type of dimpled sub-floor product (such as Seperseal All-in-one). Does this sound like a good idea? Is it absolutely neccesary to place a layer of ply between the carpet and the subflooring?? Should a layer of waterproofing paint (used for the walls) be applyed to floor before laying the other stuff down???

3) From looking at the outside photo, what would be the best way to landscape the area to prevent water from pushing against the basement wall?

4) We are considering an infrared quartz heater. Is this a good option for a basement? I know they are supposed to be more energy efficient, but is this the case for basements? I am concerned that all of the energy is going to be absorbed into the walls and floor (a massive heat sink given that it's underground) and that this may not be a good option. Is this another bad assumption??

A long post and a lot of questions, but thanks for any advice on all of this!

- AL
Attached Thumbnails
Basement moisture/humidity issues-inside_-basement.jpg   Basement moisture/humidity issues-outside_grade.jpg  


amason2308 is offline   Reply With Quote
Old 09-11-2012, 03:46 PM   #2
Join Date: Nov 2011
Location: Hartfield VA
Posts: 34,590
Rewards Points: 14,312

Working gutters with down spouts that keep the water at least 4' from the foundation.
Get that grade sloped away from the house.
May even need a french drain.


joecaption is online now   Reply With Quote
Old 09-12-2012, 08:27 AM   #3
Join Date: Sep 2012
Posts: 2
Rewards Points: 10

The gutters are in decent shape and run toward the other end of the house (in the same direction as the slope of the grade) and flow away from the house, so I think any water accessing the basement wall originates from upslope of the house. Is there a minimum depth for the french drain that would capture the majority of the water? I'd prefer not to dig all the way down to the bottom of the foundation (3-4 ft).
amason2308 is offline   Reply With Quote

basement , dehumidifier , flooring , humidity , moisture

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
At a crossroads in my basement project - waterproofing help needed callisto9 Building & Construction 37 07-06-2015 07:40 AM
Finishing 100 yr old basement with minor hydrostatic water issues oldfoursquare Remodeling 1 02-12-2012 03:57 PM
Cutting out a concrete basement floor jeffhoward001 Building & Construction 21 01-17-2012 08:51 PM
basement water issues vote4Pedro Building & Construction 0 08-27-2011 09:37 PM
Adding Subpanel for Basement - Few Questions mindle Electrical 28 01-07-2010 08:49 AM

Top of Page | View New Posts


Search Engine Friendly URLs by vBSEO 3.6.1