Attic insulation and walkways
So I moved into my “new” (built 2003) house about 1.5 years ago. Been doing several projects, but one area I have not had much of a chance to check out is the attic. I have poked my head in there a couple of times, but it is not easy to access (small hatch in master bedroom closet) or walk around in. I’d like to be able to move around better up there, particularly after rain storms,etc. just to check for roof leaks, etc. I’d also like to beef up the insulation some (IIRC, about 12 inches of blown in fiberglass, not too sure on that though, and it appears “thin” in some spots, not very evenly distributed). So I have a couple of questions:
1. What is the best way to create some attic walkways? Plenty of headroom down the center of the attic. I was thinking (and this ties into question 2) of removing the blown in insulation from between the floor joists, replacing with rock wool insulation, plywood planking over that (maybe 2 foot wide for walking) on top of the joists, and then covering that with more rock wool insulation to desired thickness. My thought is the rock wool is easy to move when I need access, and then easy to put back when I am done up there so the walkway area is still fully insulated.
2. In order to beef up the insulation some, I was thinking of removing the blown in from between the joists, putting in rock wool to the top of the joists (likely R-15, not sure if they are 2×4 or 2×6 joists), and then replacing the blown in back on top of the rock wool. My reasoning for this is that I likely will not be able to do all this at one time, so hauling the blowing machine, etc., home multiple times as I do this in stages might be challenging. Just want to be sure I am not creating more problems for myself with two “layers” of different types of insulation.
As I do some of this work I also plan of getting rid of the single return air on the second floor (in the ceiling) and putting in ducted returns from each bedroom instead.
I am in climate zone 4 (almost into zone 5) in Maryland, almost into PA.
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