C-16-109 - Radon Challenges - Gnarly Tales from the Field (CERTI-325)

Interpreting radon measurements or mitigating buildings with radon concerns is not always as easy we would like them to be. Experienced radon professionals from both sides of the profession occasionally will run across a situation that doesn’t necessarily fit the simple diurnal cycles that affect stack effect or houses that don’t adhere to the simple mitigation diagrams we often see in texts.
Sales price $225.00
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This course addresses unique challenges to the radon professional including:


  • Buried Return Ducts
  • Untreated Adjacent Foundations
  • Wind Spikes
  • Working with Tight Soils
  • Highly Permeable Soils
  • Leaky Forced Air Ductwork
  • Inaccessible Crawlspaces
  • Emanation from Contaminated Building Materials
  • In-Floor Heating Systems
  • Post Tension Slabs


This course goes beyond simply identifying these concerns but actually presents solutions using real life case studies.  It also demonstrates the use of diagnostic equipment to aid one in identifying a problem and provides downloadable tools that the student can use for estimating pressure drop in mitigation systems, air flow as well as the significance of a radon emanation source.


Recorded with a live audience, the virtual student benefits from the formal instruction and contributions from the seasoned professionals who participated.


The format of the course combines video of presenter and attendees synchronized with powerpoint slides for an experience comparable to being “in the classroom” without the hassle, which has become a hallmark for CERTI courses.



Course Includes:

  • Video (can be paused and navigated via Table of Contents or Key Word Search)
  • Online Quizzes
  • Downloadable Course Certificate
  • 16 CE Credits  (Category 1)


  • Download/Streaming - No course materials will be shipped - everything you need is available to access and download online.
  • Materials Shipped - This option includes shipment by U.S. Priority Mail within the continental U.S. of course materials which includes a binder with the course manual and a CD.  You also have access to all course materials online.  Cost - $20 


Tuesday, 14 May 2019
Debra said: Doug is a great speaker
Jeff Woolum
Saturday, 11 May 2019
Leo said: Good course for advanced mitigators.
Oleksandr Zhdanyuk
Thursday, 02 May 2019
Thomas said: I've been doing this type of work for 11 years and have been to homes with some of these same situations. I got levels down but, on some it was luck. Now I know what I did right and what i did wrong.
Jamie Budiac
Monday, 29 April 2019
Richard said: Great class for a mitigator that has been in the industry for a while.
Michele Trost-Hall
Monday, 29 April 2019
Fred said: Great
Terry Sandmeier
Monday, 29 April 2019
Ryan said: n/a
Ethan Sandstrom
Monday, 29 April 2019
Ryan said: I recommend
Ethan Sandstrom
Sunday, 28 April 2019
Joseph said: I recommend 5/5
Connor Small
Sunday, 21 April 2019
Darren said: excellent
Sunday, 31 March 2019
Matthew said: I recommend this course 5 out of 5
Isaac Hollenback
Saturday, 30 March 2019
Guntis said: Although these situations are rare, it is good to have the ability to find tough solutions.
Terry Cartwright
Tuesday, 26 March 2019
Gary said: I really appreciate the attending class members with their stories of experiences and relationship to the course being given.
Darren Smith
Thursday, 21 March 2019
Anthony said: great
Steve Mares
Tuesday, 19 March 2019
Jerry said: The course was great. After the first 15 minutes you know that Doug Kladder has the knowledge and the experiece.
Tuesday, 12 March 2019
James said: useful
Rory Fehr
Wednesday, 06 March 2019
Jon said: I recommend this course 5 out of 5
Thursday, 21 February 2019
Mark said: I had problems logging in to the website (multiple times). The nice lady on the phone (Kelly) was very helpful
Jeff Beck
Monday, 11 February 2019
Jane said: Very Informative on all aspects!
Zack Gee
Wednesday, 06 February 2019
Michael said: I recommend this course 5/5
Tuesday, 05 February 2019
David said: Yes I reccomend
Wednesday, 30 January 2019
Manass said: Great content
Harry Johnson
Wednesday, 30 January 2019
Manass said: Great content
Harry Johnson
Tuesday, 29 January 2019
ricky said: very good refresher
Friday, 25 January 2019
Kurt said: The course was excellent. Like the house on the hill.
Larry Harris
Saturday, 19 January 2019
Stephen said: Much of the information was new to me as I am a home inspector and radon measurement specialist and honestly I'll likely never use a good bit of it. But I will inspect mitigation systems with much more scrutiny and I will be able to speak more intelligibly to my clients in regards to radon entry. Thank you CERTI!
Drew Sinclair
Monday, 14 January 2019
Troy said: great knowledge of problem houses, really opens up possibilites and the mind to things I've never dealt with
Darryl McCaw
Saturday, 12 January 2019
Norman said: Very helpful and informative. Better than any other CE I have attempted in 32 years!
Roger Fenton
Wednesday, 09 January 2019
Ernest said: Instructor was very knowledgable for the course and the material will be useful if I ever run into any problems.
Virginia Van Valkenburg
Wednesday, 09 January 2019
Ernest said: Instructor was very knowledgable for the course and the material will be useful if I ever run into any problems.
Virginia Van Valkenburg
Monday, 07 January 2019
Rhonda said:
Dennis Bird
Thursday, 03 January 2019
Thomas said: This Is A Good course the the beginner as well as a seasoned person.Thank you for the info
Thomas R. Stephenson
Tuesday, 01 January 2019
Curtis said: fun class
Christopher Soles
Tuesday, 01 January 2019
Curtis said: fun class
Christopher Soles
Monday, 26 November 2018
Lloyd said: Great information.
Keegan Lutz
Sunday, 11 November 2018
Susan said: Interesting
Chris Reyerson
Saturday, 03 November 2018
Jason said: first re certification course. was good.
Saturday, 27 October 2018
Nicholaus said: I wish it worked on the iPad/iPhone better, video only worked intermittently. The Smart Player app didn't really work either. Also the spreadsheet didn't configure correctly for me on quiz 3. I was using Numbers and Google Sheets on the Mac. I don't have Excel. Other than the technical issues-(I'm pretty technical) I enjoyed the course, I learned a lot!
Tuesday, 09 October 2018
Stephen said: no comment
Matthew Slenker
Tuesday, 09 October 2018
Stephen said: I recommend this course
Matthew Slenker
Monday, 08 October 2018
Jeff said:
Brian Keeler
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