• Plastic shortage: Alternative Pipe materials?
    Try being a mitigator in Canada $64.00 a stick for sch 40 4” pipe, if you can find it.
    Gas is almost $6.00 a gallon, hence why our systems are $2,500.00 plus
  • Mitigating with French Drain and Weep System
    Both Bob Wood and myself, have encountered a product called Leak Bye, basically core plast running the entire perimeter of slab most of them, we spray foam over, only one, have I managed to use a central suction point and an RN1 fan and managed to mitigate the radon, without any pressure change, within the structure and no smoke loss, through the leak bye.
  • Slate tile and antique radios as a radon source?
    Test the water, just to eliminate that from the equation, but for gods sake, get a manometer, you can’t quantify smoke!
  • Alarms are mandatory now on radon systems
    As a Carst founding father, trained by Arthur Scott, Jack Bartholowmew and over 30 years in the commercial HVAC industry, my dedication to creating a bullet proof industry standard, has taken up 25% of my time, serving my customers is the balance of my time.
    We definitely have doubled our business, during Covid times, but by taking a few minutes on the phone, to each customer, telling them, we will see you in a month, they get it!
  • Alarms are mandatory now on radon systems
    Bill, with respect to your question about CRM’s, Bob Wood and myself used to recommend safety siren Pro 3’s as they were the only thing available.
    However most have failed high, within 5-6 years, some as little as 3 years.
  • Alarms are mandatory now on radon systems
    With respect to re entry, I did have it occurr once, in a very low cfm system, a simple 4 to 2 1/2 bushing, increased the velocity enough, to solve the issue.
  • Alarms are mandatory now on radon systems
    Wow, seriously- if one of my systems isn’t maintaining levels below 2.7 and its -40, I’m there fixing issues- but guess indoor fans are a better choice- never got a call in 14 years.
    Yes we all support thousands of systems- but they are my salespeople, treat them right!
  • Alarms are mandatory now on radon systems
    Especially scary when builders are using thin wall pipe!
  • Alarms are mandatory now on radon systems
    Being Canadian, we protect our bmo49cri2017worn.jpeg
    systems to -40 and most of us mandate the use of 24/7 monitors, not just Utube visual indicators, that doesn’t tell you if system is actually mitigating radon levels-Air things monitors are very accurate for the price point and tell the true story of function.
    Just my 2 cents.
  • Smoke testing of membrane below a slab.
    We would routinely do smoke testing when commissioning fume hood and commercial kitchen hoods.
    A smoke generator with long duration smoke oil, is best, today, I would use an Fantech RN4 variable volume fan- with a membrane, you have to be very careful, not to over pressurize it and blow the seals! Ballast your membrane first.
    We typically, depressurize our membranes and use smoke on the seams and foundation connection- much less likely to blow a seals.
  • Wet / dry vacs
    Check out Nilfisk, we used them in duct cleaning industry,
    Easy 100” but crazy $$$
  • radon testing in an hour
    Yes I have scene them and they stack up well to my $3000 monitor, however they are a non listed homeowner device. Not meant to be used for a professional test.
    We mandate that our clients monitor their radon levels, post mitigation and these devices are great for that. They do have a professional version aswell, but I’m sure you are referring their homeowner use one.
    Yes they do show a value, in an hour, but we don’t mitigate with anything less than a long term test, by a listed device.
  • Sealed poly in Passive Crawlspace System
    I remember the first membrane my partner installed, called me in a panic as it was “blowing up” no actually it’s being sucked up, because you have a perfect seal.
    Yes membrane systems typically move more air, but simply measure the variations in house pressure, with fan on / off - no pressure change =no leaks!
  • reasons for mounting the fan and exhaust piping outside building envelope in US
    Soffit vents are pretty much standard on all homes in Canada, as with gas code, the minimum clearance for a furnace is 3 feet from a soffit vent, however the rim joint is the top of basement foundation wall, where the main floor , floor joists sit and are banded, with “rim joist”
    You can’t get much further away from a soffit. 10-20feet.
    877936BB-6A94-4A82-A9C8-62ED3DE113F0 (3M)
  • reasons for mounting the fan and exhaust piping outside building envelope in US
    I will reach out to Health Canada, to find the dispersion testing they did on one of my 20,000 Bqm3 homes, it was really great.
  • reasons for mounting the fan and exhaust piping outside building envelope in US
    Since Bob Wood, seems to be sleeping.
    I have over 3000 Canadian Radon systems, no reintrainment and every home gets a AIR THINGS monitor, just as a we have smoke and Carbon Monoxide detectors.
    Today’s fans don’t leak, so long as you stick to the big 3
    PVC pipe, is highly robust and it has proven the test of time, with millions of HE furnace installations- leaks = death, literally!
    So we have chosen to eliminate the major failure that -40 deg temps, impose on a Radon system-using indoor fans.
    But 0 failures in 14years.
  • Denver Radon PFE presentation
    Good presentation, 1 thing, vent your vacuum outside.
    You can buy PFE test rigs from Radonmatters
  • Anyone heard of these folks?
    That first one is scary, for sure- Being Canadian and actually do specialize in indoor installations, aside from fan sizes, 99% of our systems look the same- they seem to use, whatever is on the truck. Nothing “standard “ - but that’s what you get for $749.00
    Is Colorado not a regulated state?

Robert Mahoney

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