Durability + Design
Follow us on Twitter Follow us on LinkedIn Like us on Facebook Follow us on Instagram Visit the TPC Store
Search the site

 

Advertisement

Paint BidTracker


Problem Solving Forum

| More

Question posted - December 24 to January 6, 2013:

How can it be determined if moisture within a CMU wall is causing repeated coating failure? If so, can the source of moisture entry be accurately identified for correction?



More items for Building Envelope


Selected Answers

From Tim Davis of Glidden Professional on January 2, 2013:
     I would agree with Channing on the need for additional information, prior to drawing a conclusion. In addition to his points, the investigation should also look at the interior operations of the building. Is there is a source of humidity that could be drawn into the CMU walls such as heaters, operations within the building, etc. If so,  then there may be a vapor drive occurring. Even if the walls are sealed, the vapor could be condensing at or above the roof deck and be carried back to the walls. The moral of the story would be that if the moisture source is not obvious, then the investigation becomes very complex. A dew point anaylsis of the facility may indicate that water vapor is condensing within the wall cavity and causing the issue. Combining a dew-point analysis with an air infiltration/exfiltration survey may prove beneficial to the investigation. It may be surprising to some, to find that the insulation and air sealing techniques can contribute to moisture issues

From Channing Lewis of ROMA - Eco Sustainable Building Technologies on January 1, 2013:
     For starters, it would help to provide more information about this particular CMU wall...is it freestanding and above grade, or is it backfilled on the exterior side or open to the air? Also, is the repeated failure in the same area or widespread across the entire surface? Look for discoloration (typically lighter in color, sometimes chalky).
      If the CMU wall is older than 5 years, have the joints shown any sign of cracking or any signs of organic growth? This is a sure sign of water intrusion. Is the failure isolated to the bottom or top of the vertical wall? "Bubbling" of elastomeric coatings is often due to moisture intrusion as well. If this is a covered structure, and CMU is contiguous to the roof, you may want to start at the top and work down performing a leak test. There are multiple tpes of CMU "block filler/primers" that will help, but if there is not a moisture/vapor barrier on the exterior side, they will ultimate fail and the water will eventually find daylight at the weakest point of exit, following gravity.


Please sign in to submit your answer this question

   

Tagged categories: Coating failure; Concrete masonry units (CMU); Humidity and moisture


Current PSF Question | Submit a PSF Question | Full PSF Archive

Advertisements
 
PPG Paints
 
PPG PAINTS™ SPEEDHIDE® INTERIOR LATEX
 
This high-hiding, low-VOC, low-odor paint enables a space to be painted while occupied and delivers the durable product performance professionals require.
 

 
A&I Coatings
 
Seal n Peel Strippable Coatings
 
Protect your assets with Seal n Peel. Easy to apply and remove. Can be left on for up to 12 months. Water based, enviro mentally friendly.
 

 
International Roofing Expo
 
IRE 2018
 
Attend the IRE where exhibitors and education offer serious solutions, real results and opportunities to make powerful connections. Register for FREE Expo.
 

 
World of Concrete
 
WOC 2018 – Las Vegas, NV
 
Visit the WOC website for more details about the World of Concrete 2018: January 23-26; Seminars 22-26 at the Las Vegas Convention Center in Las Vegas, NV, USA.
 

 
Atlas Material Testing Technology
 
Helping You Put Your Products To The Test
 
  • Outdoor Accelerated Weathering
  • Laboratory Testing Services
  • Accelerated Weathering Instruments

  • www.atlas-mts.com
    atlas.info@ametek.com
 

 
Digital Facilities Corporation
 
Manage the Building Envelope
 
FM-Pro™ is an innovative solution for the assessment and management of Roofing, Facade and Paving for building owners, asset area consultants, and product suppliers.
 

 
EMME Controls
 
EMME (Energy Management Made Easy)
 
We are a manufacturer of a temperature control & energy management system which works with most any existing heating & cooling equipment, providing significant value/impact as it relates to comfort & energy savings.
 

 
 
 

Technology Publishing Co., 1501 Reedsdale Street, Suite 2008, Pittsburgh, PA 15233

TEL 1-412-431-8300  • FAX  1-412-431-5428  •  EMAIL webmaster@durabilityanddesign.com


The Technology Publishing Network

Durability + Design PaintSquare the Journal of Protective Coatings & Linings Paint BidTracker

 

© Copyright 2012-2017, Technology Publishing Co., All rights reserved