Latest Discussions : Basement & Foundation


04:17PM | 05/25/04
Member Since: 05/24/04
2 lifetime posts
Hi everyone

In my traditional 4BR colonial, I have an 'attic' space above my 1st floor family room accessible through the garage loft. It is about 16'x12'. The floor joists have R13 kraft faced insulation from previous owner between them, but it does not fill the joist height. I wanted to put some plywood flooring on part of it, but I also wanted to add a 2nd layer of insulation. Should I:

1. Add a 2nd layer of unfaced R13 and slightly compress it when laying the plywood?

2. Don't floor the space (There's no reason to access this area anyway) and lay unfaced R19 over the R13.

3. Lay the plywood over the R13. Then lay R19 over the plywood floor. (is this illogical?)

Thoughts and opinions are welcome.

Thanks in advance!


07:20PM | 05/25/04
Member Since: 07/01/03
549 lifetime posts
If the attic does not need to provide a storage function, your best best option is to add unfaced insulation, perpendicular to the existing. You can use wider blankets or batts to make the job easier, and the air-space between the layers just increases your R-value. This will give you the maximum thermal resistance. The addition of plywood (option 3)would be an unecessary expense and would serve no function, compressing existing insulation (Option 1) and applying more insulation on top would be less efficient. Option 2 makes the most sense, but lay the insulation perpendicular to the existing course or joists.

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