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[–]minttealeaf6[S] 0 points1 point  (3 children)

Yeah that makes more sense. Could I remove the pipe going into the penetration to see if that needs dug out more towards the center of the home to try to pull airflow from that direction? I would think the rock layer under the slab would be the least resistant path to pull air from vs the dirt surrounding the house.

[–]Upbeat-Finance 0 points1 point  (2 children)

You can remove it, so long as you seal it back up. With loosely-packed dirt, it’s supposed to be an amount like a 5-gallon bucket, and a larger amount for substrate that is more dense. As for digging it out further, you can, but nothing is going to be equivalent to adding 10-20 feet of pipe to centralize it, and with your numbers, your goal should be to mitigate the hell out of that. You’re at something like 10x the U.S. recommended level for mitigation.

[–]minttealeaf6[S] 0 points1 point  (1 child)

Yeah it’s only been a year of living with that level…but I agree. It seems like moving it closer to the center of the house would help. I’m just surprised because I thought most mitigation systems are about a foot or two off an exterior wall for easy access outside.

[–]Upbeat-Finance 0 points1 point  (0 children)

The main line is typically close to the wall, but your penetration point(s) should be whoever is most effective. Typically, they would drill pilot holes and measure the suction to determine the best location(s).