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Keith_MN
Trouble with a cold room.
Keith_MN

I have a 1950's ranch style home that was flipped before I purchased it. Overall they did a great job, i'm just finding little problems here and there associated with an old home. I'm trying to figure out how to diagnose a cold room. Last spring I posted on the forum and got great help in choosing insulation.

https://advice.thisoldhouse.com/showthread.php?127015-Diagnosing-Cold-Wall-Spots

I took down two walls and filled with new/higher R value insulation. Now I've traced the cold spot that is giving me problems to the exterior facing corner. It was around 15 degrees outside when I was taking measurements, the thermostat was set at 69 in the house and the room was approximately 68 (with doors open to main living area). If I shut the door the room will drop to around 63 because of the cold corner. Measuring right where the moulding and carpet meet in the corner it was approximately 40 degrees. In the basement, right under this spot it is still 58-64. The basement room below is 64 (unfinished block walls, no insulation).

I'm trying to understand what could be wrong with the insulation or if this signifies a gap in the vapor barrier outside the room on the corner. This area is right under a window where I did replace the insulation and worked hard to make sure it was correct. New windows were put in and taking the IR gun to the windows outside I notice slightly warmer temperatures on the outside around a few sections of the window (range 15-20F). The cold spot on the wall is concentrated right at the carpet/floorboard.

Would like some suggestions on what to look at / examine and really appreciate this forum for all the guidance.

Thank you
Keith

Apple Valley, MN

johnjh2o
Re: Trouble with a cold room.
johnjh2o

What type heat do you have? It may be a matter of balancing the system.

Keith_MN
Re: Trouble with a cold room.
Keith_MN
johnjh2o wrote:

What type heat do you have? It may be a matter of balancing the system.

Hi John - Thanks for the reply, I have a gas furnace that was installed 1 year ago. Air balance was on of my first thoughts. I checked air flow at each register in the room (hot wire anometer) and the return to make sure it was flowing properly. There isn't a major difference between this room and others, it's actually quite close to the furnace. If it weren't for the extremely cold spot on the wall I thought I would be able to mitigate it more with just balance. Because the foot-long stretch of wall is so cold I'm worried not fixing it will just cause more issues with condensation.I was more worried that by shutting other vents to throw more air into the room it would be bad for the system.

thanks!

keith3267
Re: Trouble with a cold room.
keith3267

In the basement corner, look at the joist cavities where the floor joists meet the rim joist, and along the rim joist that runs parallel to the floor joists. Is there any insulation? The rim joists should have some insulation against them. A spray foam would be the best, but very expensive. Foam boards would work too, but you have to cut each one to fit and then use a little foam in a can to seal them in place. 6" batts would be probably the cheapest and easiest. Either use unfaced batts or put the facing towards the inside.

If your basement has a finished ceiling, you will need to tear it out around the perimeter.

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