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I have fiberglass filling my rafters, very nearly to the top. To meet my insulation target, I plan to install another 3" layer of fiberglass perpendicular to the existing fiberglass... but this doesn't allow me a way to walk through my attic... Should I make a catwalk by laying a 12" piece of 2x4 from one rafter to the next, spaced every other roll width and then connecting them with planks? I want my roofer to be able to inspect the inside of the roof, etc. not looking for storage.

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  • In my area, the not-yet-official standard is to glue tall marker pegs of plasterboard (drywall) to the woodwork. Then when walking you can see where the beams are . Commented Oct 17, 2021 at 6:29

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Why don't you use 1" or 2" thick XPS insulating panels (R-5 per inch)? Cut them to the width you want, lay them down across the joists, then put 1/2" plywood (cut to the same width as the XPS panels) over top of the XPS. That should be fine for a catwalk.

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