Great info. Thanks for all the replies.

ok so one more question... may sounds stupid but I'm gonna ask it any ways. If radon is a by product of natural nuclear material breaking down under ground and is considered a radioactive gas, Why are we not piping it through a more suitable pipe so there is no radioactive leakage into surrounding materials. Maybe even the pvc pipe wrapped in maybe some form of reflective blanket? i just thought I'd throw that out there.

thank you

I have seen where the sump pit set in front of the Draw pipe for the radon. Basically they had a 4" pipe going right through the concrete pad and then about 8-12" away was the sump pump pit with a sealed lid. I had thought about that as well. As mentioned above after posting the previous info I was searching the web for install pictures and came across the one I described above. And after reading yours and Davids posts back to me I think that is the better install option. And not sure if NC requires it or not, but more than likely will, I will impress upon my installer what I would like to have and see what we thinks and come to some kind of agreement. After all at the end of the day I have to look at it for the next 30-40 years and he has to be able to make it fit code and testing. I have seen in a few houses here in America when I was an alarm installer where they used Plexi or Lexan caulked and screwed right to the cement floor to seal sump pit.
Yeah I was just planing like a really tall closet space from floor to ceiling in the garage and just have just the tube pass through the garage roof area, this way the fan would just draw what was in the closet not the attic as well. No sense in bringing down that OVERLY hot North Carolina garage attic heat into the garage.lol..But good points and I am sure I will change my mind by then about it.

The garage cieling sits well over 13ft off the floor and I do not have direct attic access. I am not worried about losing a 1ft-1-1/2ft of space in my garage in order to make it easier on me or a tech to come change out a fan if the need ever arises. The garage will not be conditioned space like the house but as an ex brinks home security installer I can tell you I hated climbing in attics to fix or run stuff. Good info about using 4" pipe for install. I like the sump pump / radon combo as it looks a lot cleaner than two separate holes ( although sealed ) and with one hole verses two it's less of a chance for a missed seal leak.

Ok so tell me if this sounds like a sound idea: I will put sump pump and radon tube in same well hole. Run radon tube up and over to the Rim joist facing the garage and pop out into the garage. Then turn up and build a small closet in the corner of my garage to house the fan unit and electrical for the fan unit, then make a single pipe or 2 run up through garage roof and outside. Since the garage is not a living space it should be ok. I will also include a small fan unit on the side of the house to draw air out of the closet space and vent outside in case fan unit or fittings leak in closet area. Let me know your thoughts.

Thanks for all the information everyone. It's very helpful.

Thanks every one. Since I am the owner / builder of the home I plan to try to do everything I can to make this house safe and last 100+ years. I am placing 8-10" of stone under (2) 1" layers of type 9 IPS foam with all seams taped followed up by a 10-20 mil poly with all seams caulked and taped shut followed up by 4" of concrete. the basement will be considered conditioned space, then the main floor will be conditioned space and finally the roof will be conditioned space with 6" of closed cell in rafters, 7/16" sheathing, 2 layers of 1" poly iso with a all joints taped and a completely sealed layer of peel and stick Water and ice shield with 3/4" batten boards for spaces with skips in between boards to allow air flow and then standing seam metal roof. I had been in contact with someone who built a house similar to what I am doing and he said he had his property tested and didn't find elevated levels of radon and did nothing with it. I was thinking Since the house is considered a conditioned space and usually you can't run a radon evacuation tube through a conditioned space, if I built a chase just for the tube and sealed it with closed cell foam all the way around and put the fan unit on the outside of the building so as to limit the joints in the house is this something that I should bring up to a mitigator as a possible solution? Or is it a waste of time? Again... Thanks for everyone's input and help. I really appreciate it.

lol... just looked at the 2018 (newest code) for North Carolina and appendix F has been deleted..lol.. figures.. Not that I was going to try this myself but At least wanted some kind of idea to maybe suggest a work around.

Thanks. Yeah my attic is a conditioned space so I will have to find a way for it to get out and still be in code. maybe run the pipe through a chase to the roof and seal all around the chase inside the attic. Thanks for the info.

Thanks for all the info. and when I signed up for this forum it did not say it was just for subscribers to AARST and asked me why i wanted to join. I figured since I answered I was a home builder ( since that is what I will be starting this year) and the Admin approved me it was ok. Any ways I figured where better to get answers than the pros to plan for my build rather than hear-say on the internet where everyone has an opinion on what's right. But again. Thanks for the help and info.