I have uncovered my geothermal brine pipes as I've noticed some water coming in through the penetrations. I see that it's completely unsealed at the moment. Additionally, the previous owner probably attended to them once a long time ago.
I'm planning to add some extra insulation mostly as protection. But what's the best way to seal the penetration?
What I'm thinking of doing is applying backing rod around the pipes and sealing the outside with Tec7, as I have some leftover. Or is there another sealant that would be more suitable? I've read about butyl sealant or just regular construction sealant.
I'm also planning to lay a draining layer of macadam 8-16 around the pipes when backfilling near the foundation. Mostly to ensure there won't be any water pressure around the holes. Is this a bad idea since it might wear against the pipes? Is there another good solution?
In the holes for our brine pipes, I filled them with foam sealant from the inside to reduce the risk of small animals getting in that way. Then we drained, so closest to the foundation wall there's isodrän, which ensures there's no standing water there, and we haven't had any problems with water intrusion, but we didn't before we drained either... so your idea of some 8-16 is probably not wrong if a little water gets in today.
Place a piece of geotextile at the bottom of the hole and also over it once you've filled it so the gravel doesn't disappear into the ground or soil creeps into the gravel. Compact the gravel as you fill it so it stays "still" and fills all voids.
I don't think it will wear on the hoses unless you're driving heavy vehicles next to the facade.
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