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Old 01-20-2010, 05:53 PM   #1
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Constructing a walkout basement mud room


Hello,
I'm looking at building a basement entrance / mudroom at my walkout basement door. It's at the corner of the basement. I have concrete block walls that are not finished with any type of wall covering other than paint. I'd like to enclose the door with a small room that will allow us to walk in and drop our boots after we're done working in the garden or shoveling snow off of the patio. I want to insulate it so that the room can be a thermal break. The exterior door doesn't seal the cold out very well. Also, I don't know if putting foam panels on the concrete walls inside this room would be necessary. I also plan to insulate the basement walls and finish them. I'm trying to decide how to seal any air leaks at the edges of the walls at the point where they meet the concrete walls. Spray foam might work but if anyone has any other suggestions I'd like to hear them. Any other suggestions or concerns on the construction of my addition would be appreciated.

Thanks!

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Old 01-20-2010, 06:08 PM   #2
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Constructing a walkout basement mud room


spray foam would work for the big gaps at the Block mortar lines, yes.
Also, between the wood frame wall you will be attaching to the block, and the block wall, add a strip (or two) of Sill Gasket to the wood wall before you attach it. The Sill Gasket is about 1/8 th inch thick and is designed to stop air infiltration against irregular surfaces, ie between a bottom plate and concrete, but you could use it here as well.
In fact, re: the spray foam, you could go so far as to cut a rabbet along the length of the std and this would give you a better seal by increasing the amount of space you can foam.

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Old 01-21-2010, 06:21 PM   #3
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Constructing a walkout basement mud room


You'll want to check with your local building department on this for safety. They may have a 3' requirement from the corner to maintain the structural integrity of the building. Also the minimum lintel size. The foam board may be helpful but we don't have a clue where you live. http://www.buildingscience.com/docum...ent-insulation

Be safe, Gary
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