Pipe for Radon Mitigation System
Hi,
Having read a bunch articles on Radon, there does not seem to be a clear indication as to the location and length of perforated pipe (corrugated Big “O” or PVC Schedule 40) that should be installed.
Most of the article I have read simply seem to indicate placing a Tee connector under the slab with gravel around and some indicate an optional of adding a length of 4-5 feet perforated pipe on either side of the Tee connector.
Any feedback as to what is the best option and material to use?
附件是我在等级图上的平板，显示了我正在考虑做什么的两个选项（蓝色和红色）。
Thank you,
阿诺德
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On a basement or conditioned crawl space, I always specify socked drain tile on both sides of the footing going to a sealed sump pit. Somewhere in the middle, I cross the basement with draintile down the middle and with a “T” to vent straight up thru the roof. If the radon levels are high or the home is very large, we install two. If radon levels are high, we also install an exhaust fan.
您是否以与地下室相同的方式对待平板？
阿诺德
I do, especially if we know we have high levels of radon, and since I need to install drainage anyways.
That makes sense. In my case, there is no drainage required since the house (slab) is sitting over 12 inches above grade.
阿诺德
Does anyone know if the vent pipe must go through the roof or if code allow it to exit through an exterior wall without any operable windows or other vents/exhaust?
Thank you,
阿诺德
It is required to extend at least 12" above the roof deck and should be located close to the ridge, plus a few other things:https://codes.iccsafe.org/content/IRC2021P1/appendix-af-radon-control-methods#IRC2021P1_AppxAF_SecAF103.5.3
You should read 2021 IRC Appendix AF Radon Control Methods and Section AF103.6.1 Vent pipe requirements. There are different techniques required in areas where designated by the jurisdictions.
Another option? Talk to your Building Dept.
Thanks Armando and I'll read up about it.
Our building department is short of useless and I have tried on two occasion to communicate with the building inspector assigned to me build with no response. It sounds this is pretty typical in my area according to others in my city, at least for the last few years.
阿诺德
It seems to me you have a lot of pipes under that slab in both plans.
我认为，假设在平板下有6英寸左右的干净砾石，那么砾石之间的空气空间应使ra在堆栈管中找到低压。
在我看来，红色外围系统很可能会从建筑物外部拉动空气，大部分ra in tem，它永远不会进入建筑物，而是为您的通风孔进入建筑物。
I think your vent stack should be in the center of the home and not near the edge as shown. I think this vent pipe should be as long and straight vertical as possible. I would not install a fan unless or until it was clear that natural stack affect from the long vertical pipe was insufficient to control your radon.
You might consider having twin systems with separate collection pipes vent stacks.
Hi Walter,
I only plan to rough-in the system since it's cheaper to do it now compared to after construction is done. There will be around 12 inches of packed gravel since the slab on grade is being built a bit higher than the surrounding grade.
我希望能把它near the center of the house and simply run one 10' pipe on either side of the Tee fitting but I cannot find a spot where the wall line up to pass the vent pipe through.
Thank you,
阿诺德
感谢您询问这个Arnold。我只是想知道它。