Waterproofing existing basements from the inside

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Learn what works, what doesn’t and why when it comes to waterproofing basements from the inside.

About this Event


For years, the question of waterproofing from the inside has dogged Peter. He kept hearing about all sorts of coatings that could “negative-side” waterproof, but didn’t know how to compare the anecdotes to building science. In this session, Peter cuts through the hype and the misdirection of standardized testing and figures out what works, what doesn’t and why. Check it out to see what stands up to the Wingnut Water Test! (webinar recorded February 15, 2018)


  1. Discuss the difference between positive and negative side waterproofing.
  2. Explain alternatives to negative-side waterproofing coatings.
  3. Describe Wingnut testing and contribute to development of better testing methods.
  4. Discuss the potential shortcomings of both negative-side waterproofing approaches and testing standards.


Free to view

Pay $25.00 for credit


Builders, remodelers, HVAC contractors, HVAC system designers, code officials, architects, home design professionals, building performance professionals, energy auditors, students, educators, apprentices and anyone with knowledge and interest in waterproofing homes.


In order to receive credit for viewing this recorded session, you'll need to pass a short quiz. A link to the quiz will be provided in your registration confirmation email. Separate registration is required for each individual requiring continuing education credit. Be aware that many accrediting agencies will not allow you to take the same course for credit more than once; therefore, if you attended this session at the conference you may not be able to receive credit for viewing the webinar.

All credits have different expiration dates, so it is to your advantage to take the quiz as soon as possible.

AIA Members of the American Institute of Architects will receive 1.25 LU/HSW for this computer based course. This course expires 3.13.2021. Questions about AIA credits should be directed to Lonna Berg at 608.210.7157 or lberg@slipstreaminc.org. Click on the following link to read our AIA CES Provider statement: https://slipstreaminc.org/solutions/education-and-training/aia-ces.

NARI This recorded session is approved for 1.25 NARI CEUs.

RESNET This course has been approved by RESNET for 1.25 professional development credits.

WI-DSPS Wisconsin Department of Safety and Professional Services has approved this course for 1 CEU for the following credentials: Dwelling Contractor Qualifier Certification and UDC-Construction Inspector Certification. Note that you may not retake the same course for credit more than once during the 1-, 2- or 4-year term of your specific credential.

This recorded session will not be pre-approved for GBCI credits; however, if you believe the content is applicable to your credential, you can self-report credits.


Peter Yost, Principal and VP – Building Performance , BuildingGreen, Inc.

Peter Yost has been building, researching, teaching, writing, and consulting on high performance homes for more than 25 years. His expertise stretches from construction waste management and advanced framing to energy efficiency and building durability. In addition to his responsibilities in his current role at BuildingGreen, Inc., Peter is a Technical Director for GreenBuildingAdvisor.com, a lecturer in Yale University’s Graduate School of Forestry and Environmental Studies, an instructor for the Boston Architectural College's Sustainable Design Certificate program, USGBC LEED faculty and a Research Associate with the University of Massachusetts Building Construction and Technology program in Amherst. Peter was also the principal author of the NAHB Advanced Green Building-Building Science course and a co-author of the USGBC REGREEN workshop curriculum.



This webinar was recorded on February 15, 2018 and is approximately 70 minutes in length.

Please see our FAQ page, call 608.210.7114 or email our registration contact: registration@slipstreaminc.org.


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