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Discussion Starter #1
I've got a 4' by 10' room in my basement that is cinder block on all 4 walls. It has a interior door into it. In the past, the door was very tight to the carpet. There is no heat, nor return. We use it for storage, but it has had some water issues from time-to-time so I haven't insulated it. I think I have the water issue resolved now, so I'm thinking of insulating it. If not, should I have an exterior door to the room. If I use an interior door, should I leave a gap to get air flow. I don't want the room to cause musty smell to the rest of the basement.
 

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We have no pictures, no drawings showing where the room is, no idea if any of the walls are outside walls.
Is this one of those cold rooms built out under a porch that always leak?
 

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Discussion Starter #3
House layout.jpg

The main floor layout for the house is shown in the attachment. The garage is a slab (no prestress). The basement room that is the subject of my post is under the room marked "Entry". FYI, the water issue was that the concrete porch in front of the entry started to slope towards the house. But that isn't the subject of this post.

So, 3 walls are exterior walls.
 

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Since you have made up your mind definitely that water problem has been diagnosed and solved, just go and provide ventilation to reduce a potential problem.

Without knowing you climate and anything more, you could be OK with ventilation, but that is based on a lot of assumptions and no details the so the percent of error is well over 75%.

Dick
 

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Post a picture.
Any rooms built like that I've seen always leak and have moisture issues, most times people wall them off.
No vapor barrier on the walls, no foam insulation to form a thermal break?
 

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Discussion Starter #7
Electrical wire (exposed junction boxes) runs through this room into the upstairs. So, I can't totally wall it off. The house is in Minnesota.
 
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