Durability + Design

Building Performance and Aesthetics

A Product of Technology Publishing
JPCL/PaintSquare | D+D | Paint BidTracker

Subscribe to D+D Magazine
Download Free eBook on Polishing Concrete

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

BASF
New resins from BASF will have metals loving water:

Excellent corrosion resistance, low VOC, high gloss, thin films basf.us/industrialcoatings
polyorders@basf.com
800-231-7868


Chemique Inc.
Paint Removal Made Easy!

Remove multiple coats in one application. Easy to use and safe. All products meet or exceed V.O.C. regulations. Contain no methylene chloride, methanol or petroleum distillates.


Shield Industries, Inc
FireGuard® E-84 Intumescent Coating - Shield Industries, Inc

Trust the certified protection of the industry’s most innovative intumescent coating FireGuard® E-84 to provide you with the 1 and 2 hour fire ratings you need.


 Allied Construction Technologies, Inc.
No Jackhammers Required.

AC•Tech’s OBS™ treatment rescues old oily, contaminated concrete slabs and allows new coatings or flooring to be installed with confidence. 10-year warranty.


Arroworthy
ArroWorthy's Handcrafted Professional Brushes

One Dip of paint with our handcrafted semi-oval Rembrandt brush, you'll see why ArroWorthy makes a professional brush of unrivaled quality and performance.


Westcoat
Bringing New Colors To Concrete Surfaces

Liven up your concrete surfaces with Westcoat's newest color choices. Introducing a myriad of Fast Stain, Liquid Dazzle, and Texture-Crete Interior colors.


L. M. Scofield
Scofield High-Performance Concrete Floors

Scofield's Formula One Polished Concrete System is the next step in the evolution of architectural concrete: durable, low-maintenance and sustainable.

 
 
 
Technology Publishing

The Technology Publishing Network

The Journal of Protective Coatings & Linings (JPCL) PaintSquare
Durability + Design Paint BidTracker JPCL Europe

 
EXPLORE D+D:      Interact   |   Blogs   |   Resources   |   Buying Guides   |   Webinars   |   White Papers   |   Classifieds
GET D+D:      Subscribe   |   Advertising Media Kit
KNOW D+D:      About D+D   |   Privacy policy   |   Terms & conditions   |   Site Map   |   Search   |   Contact Us
 

© Copyright 2010-2014, Technology Publishing, Co., All rights reserved
2100 Wharton Street, Suite 310, Pittsburgh PA 15203-1951; Tel 1-412-431-8300; Fax 1-412-431-5428; E-mail webmaster@paintsquare.com