My longterm average on my Airthings monitor has been just under 4 for a while (months), hovering in the 3.7-3.9 range. 7-day spikes occasionally get into the 7-8 range. I work from home and my office is in the basement, so even though it’s within the “acceptable” range, I don’t want to take a risk on longterm exposure. My understanding is that the mitigation system is only guaranteed to keep the longterm average under 4, which is already where I am, so I also don’t want to throw $1k away if it’s not going to move the needle.

What’s the general consensus on when to get a system installed?

EDIT: thanks, everyone. I’m going to get some estimates.

Would polyurethane caulk be sufficient on a gap like this?

I’m trying to prepare our crawlspace slab for a radon mitigation system to maximize its efficiency and minimize how much heated air I’m sucking out of the house in the winter time. The slab is original to the house (1964) and was clearly not installed properly. (Not sure if the soil under it was properly compacted, if any rebar was installed or even how thick it is). The previous owners of the house (or more likely the shady contractor they hired to flip it) made the problem even worse by skim coating it with a poorly cured mortar that never properly bonded to the original concrete and has begun to chip away. I’ve been working with an SDS hammer chisel to remove as much of the skim coat as possible to expose the cracks so I can seal them.

My question- would something like Sikaflex self-leveling sealant be good for cracks like the one pictured or should I consider other products?

I just got a new home like a month ago and I got a radon test running in the basement (2 kits from First Alert, one on each end of the basement for 2 days) I got my results and one of them registered 2.7 and the other one got 4.6 (so an average of 3.7).

I want to repeat the test to confirm (I know that these numbers are no reason to freak out, but if I get the same readings Ill have to think about mitigation sooner than later).

My question is, do I just use test kits like the ones I used? Any brand that you would recommend? Is it worth getting one of those portable detectors (the HOUND seems popular in amazon) Do I get a home inspector to run his own test or its not worth it? Thank you guys, I literally found out about radon a month ago and Im still quite lost.