I am curious if it could be that the room is sealed up too well. The vapor condenses because it has nowhere to escape to. Look at some Matt Reisinger videos. He does a good job explaining the processes behind air exchange for homes (or rooms) that are sealed well. If it is sealed up too well, maybe the simple solution would be to condition the space with a Mini-split AC unit, a window unit, or by simply installing a "jumper" (often used to ensure adequate airflow between rooms). Another way would be to keep the windows between the mudroom and the conditioned space of the rest of the house open so that the mudroom is conditioned also (you would need an appropriately sized air conditioning/heating system to accommodate the additional size of the mudroom. One thing that I think would be critical would be to ensure that there is enough fresh air exchange between the outside and the mud room. Adding a dehumidifier would also be a possible solution. I hope this helps.

Hi. I don't live in an area that gets a lot of rain, but we do get a lot of snow and I know people that have major flooding issues in the Spring and water run off and into the home. What works well is outside your home you need to check the grading of your yard. The water is coming from the outside into any path it can find. Get a shovel, sand and gravel and work on sloping the ground away from your foundation. Add a drainage field to areas that have standing water. This should help tremendously. Inside I believe you can purchase a free standing de-humidifier which should help. I know someone who bought a brand new house that had serious flooding issues in her yard and had lakes of water in her yard every Spring. She also has clay soil that does not drain well at all. So she hired a contractor to put in drain fields in her yard. It worked well. So see what kind of soil you have--watch some youtubes..etc. And see how it goes... I am not a contractor or a professional so I would suggest you get professional advice on what would work best for your situation. Also, make sure you have proper thresholds/seals for you doors. Seal any cracks in the foundation, check under the house, look for paths for water, is the room getting enough heat--venting, airflow, etc. 😊

1. Remove that "great stuff" it will wick the moisture from the floor up your walls and you will get mold behind the wall panels. 2. You need a "French Drain" adjacent to the perimeter... dig a V trench and lay down drain tile (black perforated plastic tubing) then cover the tubing with pea gravel to flush the ground over the tubing. Make sure that you extend the tubing away from your house and lead it down hill so gravity will send the ground water collected in the french drain away from your house to a lower elevation. 3. You may need a sump pump well and drain tile under you concrete slab to control the ground water if the exterior drain does not resolve it completely.

@sunsetcaptiva8573

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You can test if a French Drain will work, dig a small trench adjacent to your door 12" wide 12" deep by 12" - 24" long in a V shape to see if water appears in the trench (while you are getting water in the house) - if water appears in the trench, then the drain should help... you'll need to help the water travel the path of least resistance AWAY from your house... you do that by making sure the drain tapers downhill away from the foundation.

@Grazing-M-Acres

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We are planning to do alot of grading in the back yard to get positive draining away from the house better and thought about putting in a french drain but didn't want to spend the money if it wasn't what was causing the moisture issue, but thank you for suggesting that, we may wind up putting in one regardless( it couldn't hurt anything)

@sunsetcaptiva8573

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@@Grazing-M-Acres It sounds like you have a high water table there. So the water is permeating from the ground up, that would reconcile why the exterior ledge near the ground is dry after a rain, but you have water rising from the ground. Is your mud room / laundry a new addition? Is that new concrete or possibly new walls? If the base plate 2x4 for the walls were mounted with bolts into the concrete, and the bolts go through most if not all of the thickness of the concrete, the water might be seeping / wicking up from those bolts / screws, which would explain why the water is next to the walls. If the water is due to a high water table, and it is wicking up from the ground, you will probably have to install the external French Drain. You might need a sump pump well and an internal drain tile system under the concrete if the external French Drain doesn't resolve the water seepage. I would try and monitor the area during a rain to see if you can determine if the water is coming in from the door, if it isn't - it is seeping / wicking upward from the ground. The external drain should be enough as long as the 2x4 base plate mounting bolts for the walls do not penetrate through the concrete to the ground. I wish you the best and hope the solution is the least possible expensive option for you...

I'd add insulated duct from this room to sunroom under ceiling

Oof idk we have that problem but only when it rains so resolved it by storm door. Maybe add one? I have no idea either. So odd

Maybe I missed this, but it there no way it is due to the concrete floor being cold and air temp being warmer (plus no ventilation) could be leading to condensation on the floor? I had an issue one time at these apartments I managed where the concrete block walls would mildew inside because heat was cranked up inside but it was cold/cooler outside.

Buy a cheap dehumidifier see if that fixes the problem

Just a thought are there any leaking pipes under the main house ? Or any plumbing under the slab to the mud room ? If so could they be broken and allowing the ground under to be saturated? If u have a pipe under the main house is leaking is the water flowing to that sod e of the house ? I agree with another comment about the great stuff foam it will wick moisture if remove it

@Grazing-M-Acres

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We don't have Any water hooked up at the moment, we're still working on the well.