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Old 8th August 2019
Here for the gear

Originally Posted by Jason Foi View Post
As long as the access door is airtight and matches the mass of your inner leaf, its not an issue acoustically. Up to code could be a different story. Check local building codes.
Back to the hatch!

I found some hardcore acoustically sealed hatches - designed for studio use - but they're likely expensive and I think overkill for my application ( I don't intend on opening the access door. Ever, really. It's just a matter of having access to the gas shut-off valve in an emergency.

So, I came across an ABS drain cleanout fitting. It's 4" (small hole but big enough to squeeze my hand through), it's deep (I can pack it with material to bring the cavity back up to some kind of isolating "par"), and it's airtight.
Attached Thumbnails
Jcoop Basement Build - Questions-abs-cleanout-fitting-lowes.jpg