I have the following problem: my attic is mostly a crawlspace for the air-conditioning unit. And that crawlspace is full of obstacles, which makes my filter very hard to reach.
My solution is to make a second push-up hatch (or ladder hatch) that is right next to the filter, as opposed to the other side of the attic.
It would go here (view from crawl-space, looking down onto ceiling of top floor.)
Some googling makes me believe that I need to place a box, with Styrofoam lid in my ceiling. Also, that is what resembles my existing hatch, at the other side of the attic.
I've measured the beams (joists?) to be close together, with only a 39cm gap between them. I guess enough for a small hatch, of custom size?
Would I place my custom box on top of the timbers, or between the timbers? It looks like I need to re-route some electricity if it goes between the timbers.
There seems to be a plastic foil on the boards. Any concerns when I cut through that to create a hole?
For the hole, I guess drill 4 times, and with a reciprocating saw cut out the panel?