this post was submitted on 14 Nov 2025
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Cold room floor help (slrpnk.net)
submitted 1 day ago by TheJesusaurus@sh.itjust.works to c/diy@slrpnk.net
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Hey, I've got a cold room in my place that is concrete on all sides, I'm going to be framing it in and insulating and I don't really need any help there unless there's anything cold room specific I should know, however.

As you can see I have a floor that appears to be a stepped concrete pit, filled with quite a lot of dirt, and what I believe is probably a tie in to the sewage drain.

Can I just get rid of the dirt? The whole room spells like petrichor because of it.

Assuming the pit continues to step down, can I just build the floor over it regardless, and do I need to support the pipe in some way if the dirt is removed?

Or, if I'm completely off base please let me know what I should be doing.

Thanks

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[–] waterSticksToMyBalls@lemmy.world 10 points 1 day ago (1 children)

I would dig it down a bit, put in some fresh gravel base and put foam panels over the top. Install a subfloor directly over the foam and flooring on that, with an access panel for the clean out.

[–] TheJesusaurus@sh.itjust.works 5 points 1 day ago (1 children)

As in backfill with gravel. Level it, and start building the subfloor right off the gravel? (On top of the foam board. Which would be floating then?)

[–] waterSticksToMyBalls@lemmy.world 4 points 23 hours ago (1 children)

Yeah basically this but where the concrete slab is shown, install whatever flooring system you want. All though I will say a concrete slab will last the longest.