re: Sunken Den in my house with water table seepage.

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I see black mold in your near future.

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Flex seal baw

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Thanks MikeD since you are the only serious response so far. I agree that would help but I'm not sure it would fix the problem totally. Thanks.

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chances are that’s almost exactly what your problem is. You need gutters and some downspouts to direct the water away from the house at the least.

Two options here. Outside grading is the easiest. If that doesn't work, then you will need to expose your exterior walls (excavator removing adjacent soil), then waterproof the walls, install a HDPE drainage pipe, then backfill with stone. If coming up through the floor, you will also need a sump.

I'd focus on identifying where the water is infiltrating from, because it isn't coming through the floor, unless it's at the baseboard somewhere.

Have you used a moisture meter on your walls yet? That could tell you if it's coming from below or above. It's a long shot, but I'd also check the attic above the room just to be sure.

Is there a grade outside that room anywhere? If ground flow is at a poor grade, once it overcomes perc it will come to the house. Diagram where the nearest downspout is vs. the room location as well.

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More of a question than a solution here... what if you poured it out level and gave up the sunken living room thing entirely? Maybe someone with some prior experience professional or otherwise can answer.

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About three months after we bought our house, there was extreme flooding in our area, and water seeped into the sunken living room. Just at the edge, no major damage. We called a landscaper, wanting to have a drainage system installed, or whatever he would recommend as a solution to prevent future issues. He recommended filling in the sunken living room. He refused to do any drainage unless that was done. We had concrete poured and then didn’t need him for drainage. This was over twenty years ago.

Similar issue in a storage room off of our basement garage. It doesn't pool water, but gets damp or wet with big rains. It could drizzle all day and not a drop inside. But if we got more than a couple inches in an afternoon, it would leak. About 8-9 years ago I bought some masonry crack filler product, in a tube like caulk, and filled in all the cracks and painted a few coats of a waterlock product on it. That seemed to help the issue for several years.

I know what ultimately needs to be done, and this is dig away from the foundation on the whole left side of the front of the house, and have tar put on. About 2 years ago I had a buddy of mine that started his own landscaping business come out and install a french drain, added dirt and sloped away from the foundation down to where the drain was installed, and did some maintenance on my gutters. Now it takes something monumental for there to be any sort of leak. A few weeks back we got over 6 inches of rain in an afternoon, and there was a little line of water seeping in. Just something about older houses with basements and eventually water is going to find its way in.

Build a wood floor that fits into the sunken living room. Install some floats beneath and wait for the next flood to try out your new living room raft.

Really though, fill it in with a base layer of sand to drain any reoccurring water seepage and cap it with concrete to match the rest of the house.